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Emerson Rosemount 8750W Reference Manual

Emerson Rosemount 8750W Reference Manual

Transmitter with modbus
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Reference manual
00809-0400-4750, Rev AA
February 2018
®
Rosemount
8750W Transmitter with Modbus
Protocol Reference Manual

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  • Page 1 Reference manual 00809-0400-4750, Rev AA February 2018 ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 3: Table Of Contents

    Contents Contents Chapter 1 Safety messages ......................1 Chapter 2 Introduction ........................5 System description ........................5 Product recycling/disposal ......................5 Chapter 3 Sensor Installation ......................7 Handling and Lifting Safety ......................7 Location and Position ........................8 Sensor installation ........................10 Process reference connection ....................15 Chapter 4 Remote Transmitter Installation ..................
  • Page 4 Contents 9.12 SMART Meter Verification test results ..................114 9.13 SMART Meter Verification measurements ................116 9.14 Optimizing the SMART Meter Verification ................117 Chapter 10 Digital Signal Processing .................... 121 10.1 Introduction ..........................121 10.2 Safety messages ........................121 10.3 Process noise profiles ......................

  • Page 5: Chapter 1 Safety Messages

    The products described in this document are NOT designed for nuclear-qualified applications. Using non-nuclear qualified products in applications that require nuclear- qualified hardware or products may cause inaccurate readings. For information on Rosemount nuclear-qualified products, contact your local Emerson Process Management Sales Representative. Reference manual...
  • Page 6 Safety messages WARNING! Explosion hazards. Failure to follow these instructions could cause an explosion, resulting in death or serious injury. • If installed in explosive atmospheres [hazardous areas, classified areas, or an “Ex” environment], it must be assured that the device certification and installation techniques are suitable for that particular environment.
  • Page 7 Safety messages NOTICE Damage hazards. Failure to follow these instructions could resulting damage or destruction of equipment. • The sensor liner is vulnerable to handling damage. Never place anything through the sensor for the purpose of lifting or gaining leverage. Liner damage may render the sensor inoperable.
  • Page 8 Safety messages ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 9: Chapter 2 Introduction

    Introduction Introduction Topics covered in this chapter: • System description • Product recycling/disposal System description The flow sensor contains two magnetic coils located on opposite sides of the sensor. Two electrodes, located perpendicular to the coils and opposite each other, make contact with the liquid.
  • Page 10 Introduction ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 11: Chapter 3 Sensor Installation

    Sensor Installation Sensor Installation Topics covered in this chapter: • Handling and Lifting Safety • Location and Position • Sensor installation • Process reference connection Related information Remote Transmitter Installation Handling and Lifting Safety CAUTION! To reduce the risk of personal injury or damage to equipment, follow all lifting and handling instructions.

  • Page 12: Location And Position

    Sensor Installation Location and Position 3.2.1 Environmental considerations To ensure maximum transmitter life, avoid extreme temperatures and excessive vibration. Typical problem areas include the following: • High-vibration lines with integrally mounted transmitters • Tropical/desert installations in direct sunlight • Outdoor installations in arctic climates Remote mounted transmitters may be installed in the control room to protect the electronics from the harsh environment and to provide easy access for configuration or service.
  • Page 13 Sensor Installation Figure 3-2: Flow direction arrow 3.2.4 Sensor piping location and orientation The sensor should be installed in a location that ensures it remains full during operation. Depending on where it is installed, orientation must also be considered. • Vertical installation with upward process fluid flow keeps the cross-sectional area full, regardless of flow rate.

  • Page 14: Sensor Installation

    Sensor Installation 3.2.5 Electrode orientation The electrodes in the sensor are properly oriented when the two measurement electrodes are in the 3 and 9 o’clock positions or within 45 degrees from the horizontal, as shown on the left side of Figure 3-4.
  • Page 15 Sensor Installation Figure 3-5: Gasket placement for flanged sensors Grounding ring and gasket (optional) Customer-supplied gasket Bolts Note Do not bolt one side at a time. Tighten both sides simultaneously. Example: Snug upstream Snug downstream Tighten upstream Tighten downstream Do not snug and tighten the upstream side and then snug and tighten the downstream side. Failure to alternate between the upstream and downstream flanges when tightening bolts may result in liner damage.
  • Page 16 Table 3-1: Lining material Fluoropolymer liners Non-fluoropolymer liners T - PTFE P - Polyurethane Table 3-2: Suggested flange bolt torque values for Rosemount 8750W (ASME) Fluoropolymer liners Other liners Size Class 150 Class 300 Class 150 Class 300...
  • Page 17 18-in. (450 mm) 20-in. (500 mm) 24-in. (600 mm) 30-in. (750 mm) 36-in. (900 mm) Table 3-3: Suggested flange bolt torque values for Rosemount 8750W sensors with fluoropolymer liners (EN 1092-1) Fluoropolymer liners (in Newton-meters) Size code Line size PN 10...
  • Page 18 Sensor Installation Table 3-4: Suggested flange bolt torque values for Rosemount 8750W sensors with non-fluoropolymer liners (EN 1092-1) Non-fluoropolymer liners (in Newton-meters) Size Code Line Size PN 10 PN 16 PN 25 PN 40 0.5-in. (15 mm) 1-in. (25 mm) 1.5-in.

  • Page 19: Process Reference Connection

    Sensor Installation Table 3-6: Suggested flange bolt torque values for Rosemount 8750W with non- fluoropolymer liners (AWWA C207) (continued) Size Class D (pound- Class E (pound- Class F (pound- Code Line Size feet) feet) feet) 48-in (1200 mm) Process reference connection The figures shown in this chapter illustrate process reference connections only.
  • Page 20 Sensor Installation Figure 3-8: Grounding with grounding rings or lining protectors in conductive pipe Grounding rings or lining protectors Figure 3-9: Grounding with grounding rings or lining protectors in non-conductive pipe Grounding rings or lining protectors ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 21 Sensor Installation Figure 3-10: Grounding with reference electrode in conductive unlined pipe Figure 3-11: Grounding for line sizes 10-in. and larger Reference manual...
  • Page 22 Sensor Installation ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 23: Remote Transmitter Installation

    Remote Transmitter Installation Remote Transmitter Installation Topics covered in this chapter: • Pre-installation • Transmitter symbols • Mounting • Wiring This chapter provides instructions for installing and wiring a remotely mounted transmitter. Related information Sensor Installation Pre-installation Before installing the transmitter, there are several pre-installation steps that should be completed to make the installation process easier: •...
  • Page 24 Remote Transmitter Installation Table 4-1: Hardware switch default settings Setting Factory configuration Internal/external pulse power External Transmitter security The internal/external pulse power switch is not available when ordered with intrinsically safe output, ordering code B. In most cases, it is not necessary to change the setting of the hardware switches. If the switch settings need to be changed, refer to Section 6.1.
  • Page 25 Remote Transmitter Installation Figure 4-1: Field mount transmitter dimensional drawing 7.49 [190,0] 6.48 1.94 [164,6] [49,0] 3.00 [128] [76,2] 8.81 [224,0] 10.5 [130] 3.07 [78,0] 2.71 [128] [76,2] 11.02 [280.0] 6.48 [164,6] 5.82 [148,0] 2.71 1.97 [68,8] [50,0] Conduit entry ½–14 NPT or M20 LOI cover Mounting screws Reference manual...
  • Page 26 Remote Transmitter Installation Figure 4-2: Wall mount transmitter dimensional drawing 3.12 [229] 2.81 3.51 [79] [71] [89] 12.03 [306] 11.15 [283] 17.68 [449] 1.94 1.94 [49] [49] 1.70 11.36 [43] [289] 1.59 [40] 3.90 7.80 [99] [198] Conduit entry, 1/2-14 NPT (4 places) Ground lug LOI keypad cover Lower cover opens for electrical connections...

  • Page 27: Transmitter Symbols

    Remote Transmitter Installation Table 4-2: Electrical data Wall mount and field mount transmitter Power input AC power: 90–250VAC, 0.45A, 40VA Standard DC power: 12–42VDC, 1.2A, 15W Low power DC: 12–30VDC, 0.25A, 4W Pulsed circuit Internally powered (Active): Outputs up to 12VDC, 12.1mA, 73mW Externally powered (Passive): Input up to 28VDC, 100mA, 1W...

  • Page 28: Mounting

    Remote Transmitter Installation Mounting Remote-mount transmitters are shipped wth a mounting bracket for use on a 2-in. pipe or a flat surface. Figure 4-3: Field mount transmitter mounting hardware U-bolt Mounting bracket Transmitter Fasteners (example configuration) ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 29: Wiring

    Remote Transmitter Installation Figure 4-4: Wall mount transmitter mounting hardware U-bolt Saddle clamp Fasteners Procedure Assemble the hardware as needed to accommodate the mounting configuration. Secure the transmitter to the mounting hardware. Postrequisites For field mount style transmitters, the LOI can be rotated in 90 degree increments up to 180 degrees if desired.
  • Page 30 Remote Transmitter Installation 4.4.2 Conduit requirements • For installations with an intrinsically safe electrode circuit, a separate conduit for the coil cable and the electrode cable may be required. • For installations with non-intrinsically safe electrode circuit, or when using the combination cable, a single dedicated conduit run for the coil drive and electrode cable between the sensor and the remote transmitter may be acceptable.
  • Page 31 Remote Transmitter Installation Figure 4-6: Best practice conduit preparation (wall mount) Safety ground Power Coil Output Electrode 4.4.3 Sensor to transmitter wiring Integral mount transmitters Integral mount transmitters ordered with a sensor will be shipped assembled and wired at the factory using an interconnecting cable. Use only the factory supplied cable provided with the instrument.
  • Page 32 Remote Transmitter Installation Figure 4-7: Replacement interconnecting cables Socket module 08732-CSKT-0001 IMS cable 08732-CSKT-0004 Remote mount transmitters Cables kits are available as individual component cables or as a combination coil/electrode cable. Remote cables can be ordered directly using the kit numbers shown in Table 4-3, Table...
  • Page 33 Remote Transmitter Installation Table 4-4: Component cable kits - extended temperature (-50°C to 125°C) (continued) Cable kit # Description Individual cable Alpha p/n 08732-0065-1002 Kit, Component Ca- Coil Not available (meters) bles, Ext Temp. (in- Electrode Not available cludes Coil and Elec- trode) 08732-0065-1003 Kit, Component Ca-...
  • Page 34 Remote Transmitter Installation Figure 4-8: Individual component cables 17 18 19 Coil drive Electrode Twisted, stranded, insulated 14 AWG conductors Drain Overlapping foil shield Outer jacket Twisted, stranded, insulated 20 AWG conductors • 1 = Red • 2 = Blue •...
  • Page 35 Remote Transmitter Installation Figure 4-9: Combination coil and electrode cable Electrode shield drain Overlapping foil shield Outer jacket • 1 = Red • 2 = Blue • 3 = Drain • 17 = Reference • 18 = Yellow • 19 = White Cable preparation Prepare the ends of the coil drive and electrode cables as shown in Figure...
  • Page 36 Remote Transmitter Installation Figure 4-10: Cable ends Coil Electrode Combination Unshielded length WARNING! Shock hazard! Potential shock hazard across remote junction box terminals 1 and 2 (40V). WARNING! Explosion hazard! Electrodes exposed to process. Use only compatible transmitter and approved installation practices.
  • Page 37 Remote Transmitter Installation Remote junction box terminal blocks Figure 4-11: Remote junction box views (field mount) Sensor Transmitter Figure 4-12: Remote junction box views (wall mount) Sensor Transmitter Table 4-6: Sensor/transmitter wiring Wire color Sensor terminal Transmitter terminal Blue Shield 3 or Float Black Yellow...
  • Page 38 Remote Transmitter Installation Table 4-6: Sensor/transmitter wiring (continued) Wire color Sensor terminal Transmitter terminal White Note For hazardous locations, refer to Appendix 4.4.4 Power and I/O terminal blocks (field mount) Remove the back cover of the transmitter to access the terminal block. Note To connect pulse output and/or discrete input/output, and for installations with intrinsically safe outputs, refer to...
  • Page 39 Remote Transmitter Installation Table 4-7: Power and I/O terminals (field mount transmitter) (continued) Terminal number AC version DC version AC L1 DC (+) (1) Only available with ordering code AX. 4.4.5 Power and I/O terminal blocks (wall mount) Open the bottom cover of the transmitter to access the terminal block. Note To connect pulse output and/or discrete input/output, and for installations with intrinsically safe outputs, refer to...
  • Page 40 Remote Transmitter Installation Table 4-8: Power and I/O terminals (wall mount transmitter) (continued) Terminal number AC version DC version AC (Neutral)/L2 DC (–) AC L1 DC (+) (1) Only available with ordering code AX. ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 41 Remote Transmitter Installation 4.4.6 Powering the transmitter The transmitter is available in three models. The AC powered transmitter is designed to be powered by 90–250VAC (50/60Hz). The DC powered transmitter is designed to be powered by 12–42VDC. The low power transmitter is designed to be powered by 12–30VDC.
  • Page 42 Remote Transmitter Installation Figure 4-16: Apparent power Apparent power (VA) Power supply (VAC) DC power supply requirements Standard DC units powered by 12VDC power supply may draw up to 1.2A of current steady state. Low power DC units may draw up to 0.25A of current steady state. Peak inrush is 42A at 42VDC supply, lasting approximately 1ms.
  • Page 43 Remote Transmitter Installation Figure 4-18: Low power DC current requirements 0.25 0.15 0.05 Supply current (amps) Power supply (VDC) Supply wire requirements Use 10–18 AWG wire rated for the proper temperature of the application. For wire 10–14 AWG use lugs or other appropriate connectors. For connections in ambient temperatures above 122 °F (50 °C), use a wire rated for 194 °F (90 °C).
  • Page 44 Remote Transmitter Installation Power terminals (field mount transmitter) For AC powered transmitter (90–250VAC, 50/60 Hz): • Connect AC Neutral to terminal 9 (AC N/L2) and AC Line to terminal 10 (AC/L1). For DC powered transmitter: • Connect negative to terminal 9 (DC -) and positive to terminal 10 (DC +). •...

  • Page 45: Chapter 5 Basic Configuration

    Basic configuration Basic configuration Topics covered in this chapter: • Cover jam screw (field mount transmitter only) • Basic setup • Modbus configuration • Local operator interface (LOI) Once the magnetic flowmeter is installed and power has been supplied, the transmitter must be configured through the basic setup.
  • Page 46 Basic configuration Flow units (register 61) The flow units variable specifies the format in which the flow rate will be displayed. Units should be selected to meet your particular metering needs. Table 5-1: Volume units Register value Units Barrels (31 gal)/sec Barrels (31 gal)/min Barrels (31 gal)/hour Barrels (31 gal)/day...
  • Page 47 Basic configuration Table 5-2: Mass units Register value Units Kilograms/second Kilograms/minute Kilograms/hour Kilograms/day Metric ton/minute Metric ton/hour Metric ton/day Pounds/second Pounds/minute Pounds/hour Pounds/day Short tons/minute Short tons/hour Short tons/day Table 5-3: Other units Register value Units Feet/second (default) Meters/second Special units Line size (register 65) The line size (sensor size) must be set to match the actual sensor connected to the transmitter.
  • Page 48 Basic configuration Register value Line size 2.5-in. (65 mm) 3-in. (80 mm) (default) 4-in. (100 mm) 5-in. (125 mm) 6-in. (150 mm) 8-in. (200 mm) 10-in. (250 mm) 12-in. (300 mm) 14-in. (350 mm) 16-in. (400 mm) 18-in. (450 mm) 20-in.

  • Page 49: Modbus Configuration

    Basic configuration Modbus configuration Each register is identified by its address (or starting address). Depending on the PLC that will be used to communicate with the transmitter, you may need to subract 1 from the address or starting address of the register. Refer to your PLC documentation to know if this applies to you.

  • Page 50: Local Operator Interface (Loi)

    Basic configuration Register value Parity Even (default) Stop bits (register 117) Sets the last bit of the data packet. Register value Stop bits 1 bit (default) 2 bits Local operator interface (LOI) Use the UP, DOWN, LEFT(E), and RIGHT arrows to navigate the menu structure. When the display lock is activated, a lock symbol will appear in the lower right hand corner of the display.

  • Page 51: Advanced Installation Details

    Advanced installation details Advanced installation details Topics covered in this chapter: • Hardware switches • Additional loops Hardware switches The electronics are equipped with two user-selectable hardware switches. These switches set the Transmitter Security and Internal/External Pulse Power. 6.1.1 Transmitter security The SECURITY switch allows the user to lock out any configuration changes attempted on the transmitter.
  • Page 52 Advanced installation details Figure 6-1: Electronics Stack and Hardware Switches Procedure Place the control loop into manual control. Disconnect power to the transmitter Remove the electronics compartment cover. If the cover has a cover jam screw, this must be loosened prior to removal of the cover. Remove the LOI, if applicable.
  • Page 53 Advanced installation details 6.1.4 Changing hardware switch settings (wall mount) Note The hardware switches are located on the top side of the electronics board and changing their settings requires opening the electronics housing. If possible, carry out these procedures away from the plant environment in order to protect the electronics.

  • Page 54: Additional Loops

    Advanced installation details Additional loops There are three additional loop connections available on the Transmitter: • Pulse output - used for external or remote totalization. • Channel 1 can be configured as discrete input or discrete output. • Channel 2 can be configured as discrete output only. 6.2.1 Connect pulse output The pulse output function provides a galvanically isolated frequency signal that is...
  • Page 55 Advanced installation details Figure 6-3: Output Option Code A—Maximum Frequency vs. Cable Length Frequency (Hz) Cable length (feet) Reference manual...
  • Page 56 Advanced installation details Figure 6-4: Output Option Code B—VDC Supply Resistance (Ω) Cable length (feet) At 5000 Hz operation with a 5 VDC supply, pull-up resistances of 200 to 1000 Ohms allow cable lengths up to 660 ft (200 m). ®...
  • Page 57 Advanced installation details Figure 6-5: Output Option Code B—2 VDC Supply Resistance (Ω) Cable length (feet) At 5000 Hz operation with a 12 VDC supply, pull-up resistances of 500 to 2500 Ohms allow cable lengths up to 660 ft (200 m). Resistances from 500 to 1000 Ohms allow a cable length of 1000 ft (330 m). Reference manual...
  • Page 58 Advanced installation details Figure 6-6: Output Option Code B—24 VDC Supply Resistance (Ω) Cable length (feet) At 5000 Hz operation with a 24 VDC supply, pull-up resistances of 1000 to 10,000 Ohms allow cable lengths up to 660 ft (200 m). Resistances from 1000 to 2500 Ohms allow a cable length of 1000 ft (330 Connecting an external power supply Note Total loop impedance must be sufficient to keep loop current below maximum rating.
  • Page 59 Advanced installation details Internal When the pulse switch is set to internal, the pulse loop will be powered from the transmitter. Supply voltage from the transmitter can be up to 12 VDC. Connect the transmitter directly to the counter as shown. Internal pulse power can only be used with an electronic totalizer or counter and cannot be used with an electromechanical counter.
  • Page 60 Advanced installation details Figure 6-8: Connecting to an electronic totalizer/counter with internal power supply (wall mount) Schematic showing FET between terminal 5 and 6 Electronic counter Procedure Turn off the transmitter. Connect wires from the counter to the transmitter as shown. 6.2.2 Connect discrete output The discrete output control function can be configured to drive an external signal to...
  • Page 61 Advanced installation details Figure 6-9: Connect discrete output to relay or control system input (field mount) Control relay or input 5–28 VDC power supply Figure 6-10: Connect discrete output to relay or control system input (wall mount) Control relay or input 5–28 VDC power supply Note Total loop impedance must be sufficient to keep loop current below maximum rating.
  • Page 62 Advanced installation details Procedure Ensure the power source and connecting cable meet the requirements outlined previously. Turn off the transmitter and discrete power sources. Run the power cable to the transmitter. Connect the DC power supply to the transmitter as shown. 6.2.3 Connect discrete input The following requirements apply:...
  • Page 63 Advanced installation details Figure 6-12: Connecting Discrete Input (wall mount) Relay contactor control system output 5–28 VDC power supply Figure 6-13: Discrete Input Operating Range С 12.5 Supply voltage series resistance Ω + Ω (KΩ) To connect the discrete input, complete the following steps. Procedure Ensure the power source and connecting cable meet the requirements outlined previously.
  • Page 64 Advanced installation details Run the power cable to the transmitter. Connect the wires to the transmitter as shown. ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 65: Chapter 7 Operation

    Operation Operation Topics covered in this chapter: • Introduction • Local operator interface (LOI) Introduction The transmitter features a full range of software functions, transmitter configurations, and diagnostic settings. These features can be accessed through the Local Operator Interface (LOI), ProLink III configuration software, or a host control system. Configuration variables may be changed at any time;...
  • Page 66 Operation Figure 7-1: Local Operator Interface Keypad and Character Display LEFT (E) key UP key DOWN key RIGHT key Display window To access the LOI, press the DOWN arrow one time. Use the UP, DOWN, LEFT, and RIGHT arrows to navigate the menu structure. A map of the LOI menu structure is shown in . 7.2.2 Basic features (wall mount) The basic features of the LOI include totalizer control, diagnostics, basic config, and menu...
  • Page 67 Operation Figure 7-2: Local Operator Interface and Character Display TOTALIZER CONTROL DIAGNOSTICS STOP START VIEW METER TOTAL DIAG VERIFY READ RESET HOME SENSOR SENSOR XMTR SIZE MENU FLOW RATE FLOW RANGE UNITS MENU NAVIGATION BASIC CONFIG Totalizer The totalizer control buttons enable you to view, start, stop, read, and Control reset the totalizer.
  • Page 68 Operation Diagnostics The diagnostics buttons provide direct access to the advanced diagnostic functions of the transmitter and meter verification. —ADV DIAG. Access the advanced diagnostic menu. —METER VERIFY. Run Meter Verification. Basic Config The basic config buttons provide direct access to the most common transmitter parameters.
  • Page 69 Operation Press XMTR MENU to access the menu. Use , , , and to navigate the menu structure. A map of the LOI menu structure is shown in Section 7.2.10. 7.2.3 Data entry The LOI keypad does not have alphanumeric keys. Alphanumeric and symbolic data is entered by the following procedure.
  • Page 70 Operation to increase/decrease the sensor size. When you reach the desired sensor size, press . Set the loop to manual if necessary, and press again. After a moment, the LOI will display VALUE STORED SUCCESSFULLY and then display the selected value. Select value example Changing the upper range limit: Procedure...
  • Page 71 Operation The first option is the totalizers. Under this section, you can view and configure the totalizers. See Section 8.2.3 for more information on the totalizer functionality. Start all / Stop all Totalizers can be started or stopped simultaneously. See Section 8.2.3.
  • Page 72 Operation 7.2.8 Diagnostic messages Diagnostic messages may appear on the LOI. See Chapter 9 for a complete list of messages, potential causes, and corrective actions for these messages. 7.2.9 Display symbols When certain transmitter functions are active, a symbol will appear in the lower-right corner of the display.
  • Page 73 Operation 7.2.10 LOI menu tree Figure 7-3: Totalizers menu map Reference manual...
  • Page 74 Operation Figure 7-4: Diagnostics menu map ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 75 Operation Figure 7-5: Basic setup menu map Reference manual...
  • Page 76 Operation Figure 7-6: Detailed setup menu map ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 77: Advanced Configuration Functionality

    Advanced Configuration Functionality Advanced Configuration Functionality Topics covered in this chapter: • Introduction • Configure outputs • Configure LOI • Additional parameters • Configure special units Introduction This section contains information for advanced configuration parameters. The software configuration settings for the transmitter can be accessed through the Local Operator Interface (LOI) or a modbus host.
  • Page 78 Advanced Configuration Functionality Each register is identified by its address (or starting address). Depending on the PLC that will be used to communicate with the transmitter, you may need to subtract 1 from the address, or starting address, of the register. Refer to PLC documentation to determine if this applies.
  • Page 79 Advanced Configuration Functionality Modbus register Used to configure error-checking methodology for the data. Register value Parity No parity Even (default) Stop bits LOI menu path Detailed Setup > Output Config > Modbus > Stop Bits Modbus register Sets the last bit of the data packet. Register value Stop bits 1 bit (default)
  • Page 80 Advanced Configuration Functionality Variable slots allows for the customization of variables into fixed Modbus register locations. Up to 30 slots can be configured using ProLink III or a Modbus configuration tool. Through the LOI, configuration functionality is limited to 10 slots. Slot indices LOI menu path Detailed Setup >...
  • Page 81 Advanced Configuration Functionality View the variable values indexed to slots 0 through 9 on the LOI. Slots 10 through 29 can only be viewed through ProLink III or a Modbus configuration tool. These are read-only variables. 8.2.2 Pulse output LOI menu path Detailed Setup >...
  • Page 82 Advanced Configuration Functionality The best choice for this parameter depends upon the required resolution, the number of digits in the totalizer, the extent of range required, and the maximum frequency limit of the external counter. Pulse factor units Modbus register The pulse factor unit assigns the unit of measure to the pulse scaling factor.
  • Page 83 Advanced Configuration Functionality Table 8-3: Pulse factor other units (continued) Register value Units Special units (1) See Section 8.5. Pulse width LOI menu path Detailed Setup > Output Config > Pulse > Pulse Width Modbus register 329, 330 The factory default pulse width is 0.5 ms. The width, or duration, of the pulse can be adjusted to match the requirements of different counters or controllers (see Figure...
  • Page 84 Advanced Configuration Functionality Minimum period (50% duty Pulse width cycle) Maximum frequency 100 ms 200 ms 1 cycle = 5 Hz 200 ms 0.5 ms 1.0 ms 1 cycle = 1000 Hz 1.0 ms To achieve the greatest maximum frequency output, set the pulse width to the lowest value that is consistent with the requirements of the pulse output power source, pulse driven external totalizer, or other peripheral equipment.
  • Page 85 Advanced Configuration Functionality 3,000 gpm Pulse Scaling = × 10,000 Hz Pulse Scaling = 0.005 pulse 1 pulse = 0.005 gal Pulse mode LOI menu path Detailed Setup > Output Config > Pulse > Pulse Mode Modbus register The pulse mode configures the frequency output of the pulse. It can be set to either 50% duty cycle, or fixed.
  • Page 86 Advanced Configuration Functionality View Totals LOI menu path Totalizer A: Totalizers > View Total A Totalizer B: Totalizers > View Total B Totalizer C: Totalizers > View Total C Modbus registers Totalizer A: 203, 204 Totalizer B: 205, 206 Totalizer C: 207, 208 Displays the current value for each totalizer and shows the totalizer incrementing/ decrementing based on totalizer configuration and flow direction.
  • Page 87 Advanced Configuration Functionality Modbus register Totalizer A: 101 Totalizer B: 103 Totalizer C: 105 Configure the direction for the totalizers as either Net, Forward, or Reverse. Register value Totalizer direction Net (default for Total A) Forward (default for Total B) Revers (default for Total C) Totalizer units LOI menu path...
  • Page 88 Advanced Configuration Functionality Table 8-5: Totalizer mass units Register value Units Kilograms Metric tons Pounds Short tons Table 8-6: Totalizer other units Register value Units Feet (default) Meters Special units (see Section 8.5.) Reset configuration LOI menu path Totalizer A: Totalizers > Config/Control > Total A > Total A Config >...
  • Page 89 Advanced Configuration Functionality Modbus coil Totalizer A: 104 Totalizer B: 105 Totalizer C: 106 Independently reset the totalizers. This requires the reset option to be configured as resettable. Register value Reset options Reset Reset all totalizers LOI menu path Totalizers > Config/Control > Reset All Modbus coil This global command will reset totalizer values to zero for all totalizers that have been configured as resettable.
  • Page 90 Advanced Configuration Functionality Modbus coil Enable/disable the ability to start or stop totalizers through the LOI. Modbus coil value Operating mode Prevent totalizer reset through the LOI Allow totalizer reset through the LOI (default) LOI totalizer reset LOI menu path Totalizers >...
  • Page 91 Advanced Configuration Functionality Configure write protection on the ability to reset the totalizers. This is a global command and applies to all totalizers. Register value Reset options Disable totalizer reset write protect (default) Enable totalizer reset write protect 8.2.4 Discrete input/output This configuration option is only available if the auxiliary output suite (option code AX) was ordered.
  • Page 92 Advanced Configuration Functionality DI/O 1 control LOI menu path Detailed Setup > Output Config > DI/DO Config > DI/O 1 > DI/O 1 Control Modbus register This parameter configures the auxiliary output channel 1. It controls whether channel 1 will be a discrete input or discrete output on terminals. Note The transmitter must have been ordered with the auxiliary output suite (option code AX) to have access to this functionality.
  • Page 93 Advanced Configuration Functionality code AX) and the outputs are enabled. If a discrete output is configured for flow limit, the discrete output will activate when the conditions defined under mode configuration are met. See Mode below. Control LOI menu path Flow 1: Detailed Setup >...
  • Page 94 Advanced Configuration Functionality Modbus register Flow limit 1: 337, 338 Flow limit 2: 341, 342 Set the flow rate value that corresponds to the high limit set point for the flow limit alert. Low limit LOI menu path Flow 1: Detailed Setup > Output Config > DI/DO Config > Flow Limit 1 >...

  • Page 95: Configure Loi

    Advanced Configuration Functionality Total mode LOI menu path Detailed Setup > Output Config > DI/DO Config > Total Limit > Total Mode Modbus register Total high limit LOI menu path Detailed Setup > Output Config > DI/DO Config > Total Limit > Tot Hi Limit Modbus register 347, 348...
  • Page 96 Advanced Configuration Functionality 8.3.1 Flow display LOI menu path Detailed Setup > LOI Config > Flow Display Modbus register Use flow display to configure the parameters that will appear on the LOI flowrate screen. The flowrate screen displays two lines of information. Register value Display Flowrate and Total A (default)

  • Page 97: Additional Parameters

    Advanced Configuration Functionality Register value Backlight control Always OFF (default for low power) 10 Seconds 20 Seconds 30 Seconds Always ON (default) 8.3.4 LOI display lock LOI menu path Detailed Setup > LOI Config > Disp Auto Lock Modbus register The transmitter has display lock functionality to prevent unintentional configuration changes.
  • Page 98 Advanced Configuration Functionality Modbus register Density units: 29 Density value: 333, 334 Use the process density value to convert from a volumetric flow rate to a mass flow rate using the following equation: Qm = Qv x p Where: Qm is the mass flow rate Qv is the volumetric flow rate, and p is the fluid density 8.4.3...

  • Page 99: Configure Special Units

    Advanced Configuration Functionality 8.4.6 Signal processing The transmitter contains several advanced functions that can be used to stabilize erratic outputs caused by process noise. The signal processing menu contains this functionality. If the 37 Hz coil drive mode has been set, and the output is still unstable, the damping and signal processing function should be used.
  • Page 100 Advanced Configuration Functionality Table 8-8: Mass units Register value Units Kilograms Metric tons Pounds Short tons Table 8-9: Other units Register value Units Feet Meters 8.5.2 Conversion factor LOI menu path Basic Setup > Flow Units > Special Units > Conv Factor Modbus register 323, 324 The special units conversion factor is used to convert base units to special units.
  • Page 101 Advanced Configuration Functionality Register value Units 8.5.4 Special volume unit LOI menu path Basic Setup > Flow Units > Special Units > Volume Unit Modbus register 411, 412 Special volume unit enables you to display the volume unit format to which you have converted the base volume units.
  • Page 102 Advanced Configuration Functionality ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 103: Advanced Diagnostics Configuration

    Advanced Diagnostics Configuration Advanced Diagnostics Configuration Topics covered in this chapter: • Introduction • Modbus communication diagnostics • Licensing and enabling • Tunable empty pipe detection • Electronics temperature • Ground/wiring fault detection • High process noise detection • Coated electrode detection ™...

  • Page 104: Modbus Communication Diagnostics

    Advanced Diagnostics Configuration Table 9-2: Advanced diagnostics availability Diagnostic name Diagnostic category Product capability High Process Noise Process Suite 1 (DA1) Grounding and Wiring Fault Installation Suite 1 (DA1) Coated Electrode Detection Process Suite 1 (DA1) Commanded Meter Verifica- Meter Health Suite 2 (DA2) tion Continuous Meter Verification...

  • Page 105: Licensing And Enabling

    Advanced Diagnostics Configuration The transmitter has been placed into listen only mode through either the host system or LOI. The transmitter is not actively sending Modbus data, but is receiving commands from the host system. Restart Modbus communication LOI menu path Diagnostics >...

  • Page 106: Tunable Empty Pipe Detection

    Advanced Diagnostics Configuration 9.3.1 Licensing the diagnostics Power up the transmitter. Verify the software version is 4.4 software or later. LOI menu path Detailed Setup > Device Info > Software Rev Determine the Device ID. LOI menu path Detailed Setup > Device Info > Device ID Modbus register 151, 152 Obtain a license key from a local Rosemount representative.
  • Page 107 Advanced Diagnostics Configuration 9.4.1 Tunable empty pipe parameters The tunable empty pipe diagnostic has one read-only parameter, and two parameters that can be custom configured to optimize the diagnostic performance. Empty pipe (EP) value LOI menu path Diagnostics > Variables > Empty Pipe Modbus register 219, 220 This parameter shows the current empty pipe value.

  • Page 108: Electronics Temperature

    Advanced Diagnostics Configuration Example: Full reading = 0.2 Record the empty pipe value with an empty pipe condition. Example: Empty reading = 80.0 Set the empty pipe trigger level to a value between the full and empty readings. For increased sensitivity to empty pipe conditions, set the trigger level to a value closer to the full pipe value.

  • Page 109: Ground/Wiring Fault Detection

    Advanced Diagnostics Configuration LOI menu path Diagnostics > Variables > Elect Temp Modbus register 209, 210 This parameter shows the current temperature of the electronics. This is a read-only value. Ground/wiring fault detection The transmitter continuously monitors signal amplitudes over a wide range of frequencies. For the ground/wiring fault detection diagnostic, the transmitter specifically looks at the signal amplitude at frequencies of 50 Hz and 60 Hz which are the common AC cycle frequencies found throughout the world.

  • Page 110: High Process Noise Detection

    Advanced Diagnostics Configuration The line noise parameter shows the amplitude of the line noise. This is a read-only value. This number is a measure of the signal strength at 50/60 Hz. If the line noise value exceeds 5 mV, then the ground/wiring fault diagnostic alert will activate. High process noise detection The high process noise diagnostic detects if there is a process condition causing an unstable or noisy reading that is not an actual flow variation.

  • Page 111: Coated Electrode Detection

    Advanced Diagnostics Configuration Modbus register 215, 216 This parameter shows the current value of the signal to noise ratio at the coil drive frequency of 37 Hz. This is a read-only value. This number is a measure of the signal strength at 37 Hz relative to the amount of process noise.

  • Page 112: Smart ™ Meter Verification

    Advanced Diagnostics Configuration Electrode coating (EC) level 1 limit LOI menu path Diagnostics > Advanced Diag > Elec Coat > EC Limit 1 Modbus register 353, 354 Set the criteria for the electrode coating limit 1 which indicates when coating is starting to occur, but has not compromised the flow measurement.
  • Page 113 Advanced Diagnostics Configuration 9.9.1 Sensor baseline (signature) parameters The SMART Meter Verification diagnostic functions by taking a baseline sensor signature and then comparing measurements taken during the verification test to these baseline results. The sensor signature describes the magnetic behavior of the sensor. Based on Faraday's law, the induced voltage measured on the electrodes is proportional to the magnetic field strength.
  • Page 114 Advanced Diagnostics Configuration Reset baseline (re-signature meter) LOI menu path Diagnostics > Advanced Diag > Meter Verif > Sensr Baseline > Re- set Baseline Modbus coil Having the transmitter take an initial sensor signature when first installed will provide the baseline for the verification tests that are done in the future.

  • Page 115: Run Manual Smart Meter Verification

    Advanced Diagnostics Configuration Set the test criteria for the no flow condition. The factory default for this value is set to five percent with limits configurable between one and ten percent. This parameter applies to manually initiated test only. Flowing full limit LOI menu path Diagnostics >...
  • Page 116 Advanced Diagnostics Configuration 9.10.1 Test conditions LOI menu path Diagnostics > Advanced Diag > Meter Verif > Run Meter Ver > Test Condition Modbus host SMART Meter Verification can be initiated under three possible test conditions. This parameter is set at the time that the sensor baseline or SMART Meter Verification test is manually initiated.

  • Page 117: Continuous Smart Meter Verification

    Advanced Diagnostics Configuration Modbus register Run the SMART Meter Verification test and verify the entire flowmeter installation. This parameter results in the diagnostic performing the transmitter calibration verification, sensor calibration verification, coil health check, and electrode health check. Transmitter calibration and sensor calibration are verified to the percentage associated with the test condition selected when the test was initiated.

  • Page 118: Smart Meter Verification Test Results

    Advanced Diagnostics Configuration Register value Units Exclude coil tests in the continuous SMART Meter Verification di- agnostic (default). Include coil tests in the continuous SMART Meter Verification di- agnostic. Electrodes LOI menu path Diagnostics > Diag Controls > Cont Meter Ver > Electrodes Modbus coil Continuously monitor the electrode resistance by enabling this continuous SMART Meter Verification parameter.
  • Page 119 Advanced Diagnostics Configuration the calibration verification report (see Section 9.14.1) . This report can be used to validate that the meter is within the required calibration limits to comply with governmental regulatory agencies. Depending on the method used to view the results, they will be displayed in either a menu structure, as a method, or in the report format.

  • Page 120: Smart Meter Verification Measurements

    Advanced Diagnostics Configuration 9.13 SMART Meter Verification measurements The SMART Meter Verification test will make measurements of the coil resistance, coil signature, and electrode resistance and compare these values to the values taken during the sensor signature process to determine the sensor calibration deviation, the coil circuit health, and the electrode circuit health.

  • Page 121: Optimizing The Smart Meter Verification

    Advanced Diagnostics Configuration The electrode circuit resistance is a measurement of the electrode circuit health. This value is compared to the electrode circuit resistance baseline measurement taken during the sensor signature process to determine electrode circuit health. This value can be continuously monitored using continuous SMART Meter Verification.
  • Page 122 Advanced Diagnostics Configuration A pharmaceutical company requires bi-annual verification of meter calibration on a critical feed line for one of their products. This is an internal standard, and the plant requires a calibration record be kept on-hand. Meter calibration on this process must meet two percent.
  • Page 123 Advanced Diagnostics Configuration Manual Calibration Verification Results Report parameters Calibration Conditions: ❑ Internal ❑ External User Name: _____________________________ ________________ Test Conditions: ❑ Flowing ❑ No Flow, Full Pipe Tag #:__________________________________ ❑ Empty Pipe ________________ Flowmeter information and configuration Software Tag: Calibration Number: Line Size: PV Damping:____________________________...
  • Page 124 Advanced Diagnostics Configuration ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 125: Digital Signal Processing

    Digital Signal Processing Digital Signal Processing Topics covered in this chapter: • Introduction • Safety messages • Process noise profiles • High process noise diagnostic • Optimizing flow reading in noisy applications • Explanation of signal processing algorithm 10.1 Introduction Magmeters are used in applications that can create noisy flow readings.

  • Page 126: Process Noise Profiles

    Digital Signal Processing WARNING! Explosions could result in death or serious injury. • Verify the operating atmosphere of the sensor and transmitter is consistent with the appropriate hazardous locations certifications. • Do not remove the transmitter cover in explosive atmospheres when the circuit is live. •...

  • Page 127: High Process Noise Diagnostic

    Digital Signal Processing 10.4 High process noise diagnostic The transmitter continuously monitors signal amplitudes over a wide range of frequencies. For the high process noise diagnostic, the transmitter specifically looks at the signal amplitude at frequencies of 2.5 Hz, 7.5 Hz, 32.5 Hz, and 42.5 Hz. The transmitter uses the values from 2.5 and 7.5 Hz and calculates an average noise level.
  • Page 128 Digital Signal Processing 37 Hz If the process fluid causes a noisy or unstable flow reading, increase the coil drive frequency to 37 Hz. If the 37 Hz mode is selected, perform the auto zero function for optimum performance. 10.5.2 Auto zero LOI menu path Diagnostics >...
  • Page 129 Digital Signal Processing Operating mode LOI menu path Detailed Setup > Signal Processing > Operating Mode Modbus register The operating mode should be used only when the signal is noisy and gives an unstable output. Filter mode automatically uses 37 Hz coil drive mode and activates signal processing at the factory set default values.

  • Page 130: Explanation Of Signal Processing Algorithm

    Digital Signal Processing Modbus register 361, 362 This parameter will set the tolerance band on either side of the running average, referring to percent deviation from the average. Values within the limit are accepted while value outside the limit are scrutinized to determine if they are a noise spike or an actual flow change.
  • Page 131 Digital Signal Processing Figure 10-1: Signal Processing Functionality Flow rate Time (10 samples = 1 second) Upper value Lower value Tolerance band Maximum percent limit Minimum percent limit Time limit • X = Input flow signal from sensor • O = Average flow signals and transmitter output, determined by the number of samples parameter •...
  • Page 132 Digital Signal Processing To avoid waiting for the slowly incrementing average value to catch up to the new level input, an algorithm is provided. This is the “time limit” parameter. The user can set this parameter to eliminate the slow ramping of the output toward the new input level.

  • Page 133: Chapter 11 Maintenance

    Maintenance Maintenance Topics covered in this chapter: • Introduction • Safety information • Installing a Local Operator Interface (field mount) • Installing a local operator interface (wall mount) • Replacing electronics stack (field mount) • Replacing electronics stack (wall mount) •...

  • Page 134: Installing A Local Operator Interface (Field Mount)

    Maintenance 11.3 Installing a Local Operator Interface (field mount) Figure 11-1: Installing a Local Operator Interface (LOI) Procedure If the transmitter is installed in a control loop, secure the loop. Remove power from the transmitter. Remove the cover on the electronics compartment of the transmitter housing. If the cover has a cover jam screw, loosen it before removing the cover.

  • Page 135: Installing A Local Operator Interface (Wall Mount)

    Maintenance 11.4 Installing a local operator interface (wall mount) Figure 11-2: Rosemount 8712 cover assembly with LOI Procedure If the transmitter is installed in a control loop, secure the loop. Remove power from the transmitter. Loosen the upper door screw and open the top electronics compartment of the transmitter housing.

  • Page 136: Replacing Electronics Stack (Field Mount)

    Maintenance Close the upper compartment door and tighten the upper door screw to ensure the housing is properly sealed to meet ingress protection requirements. Return power to the transmitter and verify that it is functioning correctly and reporting the expected flow rate. If installed in a control loop, return the loop to automatic control.
  • Page 137 Maintenance Figure 11-4: Transmitter Housing Electronics Board Identification Key indicators 8732EM housing (correct) 8732ES housing (incorrect) Figure 11-5: Electronics Stack Identification 8732EM stack board 8732ES electronics stack Follow the steps below to confirm the transmitter housing is compatible with this electronics kit.

  • Page 138: Replacing Electronics Stack (Wall Mount)

    Maintenance Prerequisites Prior to installing the replacement electronics stack, it is important to verify that the transmitter housing you have is of the correct design to accept the Revision 4 electronics. Procedure Verify the model number is 8732EM. If the transmitter model is not 8732EM, then these electronics are not compatible.

  • Page 139: Replacing A Socket Module/Terminal Block

    Maintenance Remove the screws from the old electronics stack and insert them into the new electronics stack. While holding onto the new electronics handle, align the electronics stack with the housing, and push the electronics stack into the housing. Securely tighten the three electronic stack screws into the housing. If applicable, plug the display connector into the display receptacle on the top of the electronics stack.
  • Page 140 Maintenance 11.7.1 Replacing an integral mount socket module Prerequisites The integral mount socket module is shown in Figure 11-7. To gain access to the socket module, the transmitter must be removed from the sensor adapter. Figure 11-7: Socket Module—Integral Mount Removing an integral mount socket module Disconnect power.
  • Page 141 Maintenance The coil and electrode cables are keyed so they will only fit into their dedicated location. If the transmitter has an LOI, it will need to be removed to access the coil and electrode ports. Once the connections are made, the transmitter can be secured to the sensor adapter using the four mounting bolts.
  • Page 142 Maintenance When removing the socket module, do not pull on the wires. Installing a terminal block socket module Insert the new terminal block socket module, press the base into its keyed position, and tighten the two mounting screws. Connect the terminal block to the junction box housing by tightening the two mounting screws.

  • Page 143: Trims

    Maintenance Installing a terminal block Clip the connecting wires to the back of the terminal block, the clips are different sizes and must be connected to their matching receptacle. Connect the terminal block to the junction box housing by tightening the two mounting screws.
  • Page 144 Maintenance Before changing any of the configuration parameters, be sure to record the original values so that the transmitter can be returned to the original configuration prior to being placed back into operation. Failure to return the settings to the original configuration will result in incorrect flow and totalizer readings.

  • Page 145: Review

    Maintenance When the routine is completed, the sensor is ready for use. 11.9 Review LOI menu path Device Setup > Review The transmitter includes a capability to review the configuration variable settings. The flowmeter configuration parameters set at the factory should be reviewed to ensure accuracy and compatibility with the particular application of the flowmeter.
  • Page 146 Maintenance ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 147: Chapter 12 Troubleshooting

    Consider all sources when identifying a problem in the system. If the problem persists, consult the local Rosemount representative to determine if the material should be returned to the factory. Emerson offers several diagnostics that aid in the troubleshooting process. Instructions and procedures in this section may require special precautions to ensure the safety of the personnel performing the operations.

  • Page 148: Safety Information

    Troubleshooting 12.2 Safety information WARNING! Failure to follow these troubleshotting guidelines could result in death or serious injury. • Installation and servicing instructions should be performed by qualified personnel only. • Do not perform any servicing other than that contained in the operating instructions. •...
  • Page 149 Troubleshooting Procedure Check for an active error message or status alert. Refer to Section 12.4. Verify the correct sensor calibration number is entered in the transmitter. The calibration number is listed on the sensor nameplate. Verify the correct sensor line size is entered in the transmitter. The line size value is listed on the sensor nameplate.

  • Page 150: Diagnostic Messages

    Troubleshooting Verify there is minimal exposed wiring and shielding. Less than 1 inch (25 mm) is recommended. Verify that the single conduit that houses both the electrode signal and coil drive cables do not contain any other wires, including wires from other magmeters. Note For installations requiring intrinsically safe electrodes, the signal and coil drive cables must be run in Individual conduits.
  • Page 151 Troubleshooting Table 12-1: Basic Diagnostic Messages (continued) Error message Potential cause Corrective action Other manufacturer’s sensor Change coil current to 75 mA - set calibration num- bers to 10000550100000030 Perform a universal auto-trim to select the proper coil current Electronics board failure Replace electronics stack Coil circuit open fuse Return the unit to the factory for fuse replacement...
  • Page 152 Troubleshooting Table 12-1: Basic Diagnostic Messages (continued) Error message Potential cause Corrective action Verify the sensor calibration number and line size are correctly entered in the electronics Flowrate > 43 ft/sec Flow rate is greater than 43 ft/sec Lower flow velocity, increase pipe diameter Improper wiring Check coil drive wiring and sensor coils Perform sensor tests - see...
  • Page 153 Troubleshooting Table 12-2: Advanced Process Diagnostic Messages (continued) Error message Potential cause Corrective action Gas/air in line Move the sensor to another location in the process line to ensure that it is full under all conditions Electrode coating Enable coated electrode etection diagnostic Use bullet-nose electrodes Downsize sensor to increase flowrate above 3 ft/s (1 m/s)
  • Page 154 Troubleshooting Table 12-3: Advanced Meter Verification Messages (continued) Error message Potential cause Corrective action Rerun SMART Meter Verification (8714i) Perform sensor tests - see Section 12.7 Sensor electrode circuit test failed Verify electrode resistance has a baseline (signa- ture) value from a full pipe baseline Verify test condition was selected properly Verify pass/fail criteria Rerun SMART Meter Verification (8714i)
  • Page 155 Troubleshooting Table 12-3: Advanced Meter Verification Messages (continued) Error message Potential cause Corrective action If the problem persists, replace the sensor Electrode Resistance Out Moisture in the terminal block of the Perform sensor tests - see Section 12.7 of Spec sensor If the problem persists, replace the sensor Electrode coating...
  • Page 156 Troubleshooting Verify the sensor is full. Verify wiring between sensor and transmitter is prepared properly. Shielding should be stripped back less than 1 inch (25 mm). Use separate shielded twisted pairs for wiring between sensor and transmitter. Properly connect the wiring between the sensor and the transmitter. Corresponding terminal block numbers in the sensor and transmitter must be connected.
  • Page 157 Troubleshooting Procedure Increase transmitter coil drive frequency to 37 Hz (refer to Section 10.5.1 and, if possible, perform auto zero function Section 10.5.2). Verify sensor is electrically connected to the process with process reference electrode, grounding rings with grounding straps, or lining protector with grounding straps.
  • Page 158 Troubleshooting Table 12-4: Troubleshooting the Electrode Coating Diagnostic Error message Potential causes of error Steps to correct Electrode Coating • Insulating coating is start- • Verify process fluid conductivity Level 1 ing to build up on the elec- • Schedule maintenance to clean the trode and may interfere electrodes with the flow measurement...

  • Page 159: Basic Troubleshooting

    Troubleshooting Table 12-5: Troubleshooting the SMART Meter Verification Diagnostic (continued) Test Potential cause Corrective action Electrode Circuit • Electrode resistance base- Health line was not taken after in- stallation • Test condition was not se- lected properly • Moisture in the sensor ter- minal block •...
  • Page 160 Troubleshooting Table 12-6: Common magmeter issue (continued) Symptom Electronics failure Corrective action • PZR activated • Remove signal at terminals 5 and 6 to deactivate the PZR. • No power to transmitter • Check pulse output wiring at terminals 3 and 4. Refer to wiring diagram for pulse counter and pulse output.
  • Page 161 Troubleshooting Table 12-6: Common magmeter issue (continued) Symptom Electronics failure Corrective action • Improper wiring • If electrode shield and electrode signal wires are switched, flow indication will be about half of what is expected. Check wiring diagrams. • Flow rate is below 1 ft/s •...

  • Page 162: Sensor Troubleshooting

    Troubleshooting Table 12-6: Common magmeter issue (continued) Symptom Electronics failure Corrective action Meter output is un- • Medium to low conductivi- • Eliminate cable vibration stable ty fluids (10–25 microsie- • Move cable to lower vibration run mens/cm) combined with •...
  • Page 163 Troubleshooting Figure 12-1: Sensor Circuit Diagram (Simplified) Electrodes Coils Sensor housing 12.6.1 Sensor adapter feed through pins The sensor adapter is the part of the sensor that provides the internal connection feed- through wiring from the internal sensor components to the socket module connections. The top of the adapter has 10 pins - four pins for the coils, four pins for the electrodes, and two pins for the process reference.

  • Page 164: Installed Sensor Tests

    Troubleshooting Figure 12-2: Sensor Adapter Feed-through Pins Electrode side Coil side Process reference Orientation key 12.6.2 Socket module Figure 12-3: Remote Mount Socket Module 12.7 Installed sensor tests If a problem with an installed sensor is identified, refer to Table 12-7 through Table 12-11 assist in troubleshooting the sensor.
  • Page 165 Troubleshooting If possible, take all readings from feed-through pins in the sensor adapter. If the pins in the sensor adapter are inaccessible, take measurements at the sensor terminal block or through remote cabling as close to the sensor as possible. Readings taken through remote cabling that is more than 100 feet (30 meters) in length may provide incorrect or inconclusive information and should be avoided.

  • Page 166: Uninstalled Sensor Tests

    Troubleshooting Table 12-10: Test D. Electrode to electrode shield Expected Test conditions value Potential cause Corrective action • Location: installed • and R • Unstable R or R values con- • Remove coating from sensor • Required equipment: LCR should be firm coated electrode wall (Set to Resistance and 120...
  • Page 167 Troubleshooting The expected values in the test below assume the measurements have been taken directly at the pins. Reference manual...
  • Page 168 Troubleshooting Table 12-12: Test A. Terminal to front electrode Expected Test conditions value Potential cause Corrective action ≤ 1 Ω • Location: uninstalled • Shorted electrode • Replace sensor • Required equipment: Multi- • Open electrode • Remove coating from sensor meter •...

  • Page 169: Technical Support

    Clean terminal block meter • Replace terminal block • 17 and 1 12.9 Technical support Email addresses: Worldwide: flow.support@emerson.com Asia-Pacific: APflow.support@emerson.com Middle East and Africa: FlowTechnicalSupport@emerson.com North and South America Europe and Middle East Asia Pacific United States 800-522-6277 U.K.

  • Page 170: Service

    Troubleshooting North and South America Europe and Middle East Asia Pacific Kuwait 663 299 01 South Africa 800 991 390 Saudi Arabia 800 844 9564 800 0444 0684 12.10 Service To expedite the return process outside the United States, contact the nearest Rosemount representative.

  • Page 171: Appendix A Product Specifications

    Product Specifications Appendix A Product Specifications Topics covered in this appendix: • Rosemount 8700M Flowmeter Platform specifications • Transmitter specifications • Sensor specifications Rosemount 8700M Flowmeter Platform specifications The tables below outline some of the basic performance, physical, and functional specifications of the Rosemount 8700M Magnetic Flowmeter Platform.
  • Page 172 Product Specifications Table A-1: Rosemount Sensor Specifications (continued) Model 8721 Style Hygienic (sanitary) Base accuracy 0.5% Standard 0.25% High Accuracy Op- tion Line sizes ½-in. to 4-in. (15 mm to 100 mm) Design features 3-A and EHEDG CIP/SIP Detailed specifications 8721 Hygienic (Sanitary) Sensor Specifica- tions Ordering information...
  • Page 173 Product Specifications Table A-2: Lining Material Selection (continued) Liner material General characteristics Linatex Rubber Limited chemical resistance especially in acids Very good abrasion resistance for large particles Softer material than polyurethane and neoprene Typically applied in mining slurries Process temperature: 0 to 158 °F (-18 to 70 °C) Adiprene Ideal for applications with high salinity and/or hydrocarbon carryover Excellent abrasion resistance...
  • Page 174 Product Specifications Table A-4: Electrode Type Electrode type General characteristics Standard Meas- Lowest cost urement Good for most applications Measurement + Low cost grounding option especially for large line sizes Reference Elec- Minimum conductivity of 100 microSiemens/cm trode Not recommended for electrolytic or galvanic corrosion applications (Also see Table A-5 Table A-6...

  • Page 175: Transmitter Specifications

    Product Specifications Table A-6: Process Reference Installation Grounding Reference elec- Lining protec- Type of pipe straps Grounding rings trode tors Conductive un- Acceptable Not required Not required Not required lined pipe Conductive lined Not acceptable Acceptable Acceptable Acceptable pipe Non-conductive Not acceptable Acceptable Not recommen-...
  • Page 176 Product Specifications Switch-on current • At 250VAC: Maximum 35.7A (< 5ms) • At 42VDC: Maximum 42A (< 5ms) AC power supply requirements Units powered by 90 - 250VAC have the following power requirements. Peak inrush is 35.7A at 250VAC supply, lasting approximately 1ms. Inrush for other supply voltages can be estimated with: Inrush (Amps) = Supply (Volts) / 7.0 Figure A-1: AC current requirements...
  • Page 177 Product Specifications Figure A-3: DC current requirements Supply current (amps) Power supply (VDC) Ambient temperature limits • Operating: –58 to 140 °F (–50 to 60 °C) without local operator interface –4 to 140 °F (–20 to 60 °C) with local operator interface The Local Operator Interface (LOI) will not display at temperatures below -20°C •...
  • Page 178 Product Specifications Start-up time 50ms from zero flow Low flow cut-off Adjustable between 0.01 and 38.37 ft/s (0.003 and 11.7 m/s). Below selected value, output is driven to the zero flow rate signal level. Overrange capability Signal output will remain linear until 110% of upper range value or 44 ft/s (13 m/s). The signal output will remain constant above these values.
  • Page 179 Product Specifications the Alarm switch on the front of the electronics. NAMUR-compliant alarm limits are software configurable and can be preset via CDS (C1). Individual diagnostic alarms are also software configurable. Alarms will drive the analog signal to the following mA values. 3.75 mA Requires CDS (C1) High...
  • Page 180 Product Specifications Diagnostic status Activates switch closure output when the transmitter detects a condition that meets the configured criteria of this output. Optional discrete input function (AX option) Externally powered at 5 - 28VDC, 1.4 - 20mA to activate switch closure to indicate either: Reset Totalizer A (or B or C) Resets Totalizer A (or B or C) value to zero.
  • Page 181 Product Specifications 0.25% 0.25% 0.5% 0.5% 24 24 12 12 18 18 30 30 (10) (10) A. Percentage of rate B. Velocity in ft/s (m/s) Analog output effects Analog output has the same accuracy as frequency output plus an additional ±4 μ A at room temperature.
  • Page 182 Product Specifications Safety grounding External stainless assembly, M5; internal 8-32 (No. 8) screws Vibration rating 2G per IEC 61298 Dimensions See Product Data Sheet. Weight Wall mount transmit- Aluminum Approximately 9 lbs. (4 kg) Add 1 pound (0.5 kg) for local operator interface. A.2.6 Field mount transmitter physical specifications Materials of construction...

  • Page 183: Sensor Specifications

    Product Specifications Dimensions See Product Data Sheet. Weight Field mount transmit- Aluminum Approximately 7 lbs. (3.2 kg) ter only 316 stainless steel Approximately 23 lbs. (10.5 kg) Add 1 pound (0.5 kg) for local operator interface. Sensor specifications A.3.1 Functional specifications Service Conductive liquids and slurries Line sizes...
  • Page 184 Product Specifications Pressure limits Process temperature limits. Vacuum limits PTFE lining Full vacuum to 350 °F (177 °C) through 4-in. (100 mm) line sizes. Consult Technical Support for vacuum applications with line sizes of 6 inches (150 mm) or larger All other standard sen- Full vacuum to maximum material temperature limits for all available line sor lining materials...
  • Page 185 Product Specifications Table A-8: Temperature vs. Pressure Limits for AS2129 Table D and E flanges Sensor temperature vs. pressure limits for AS2129 Table D and E flanges (4-in. to 24-in. line sizes) Pressure @ -29 to 50 °C Flange Material Flange Rating (-20 to 122 °F) @ 100 °C (212 °F)
  • Page 186 Product Specifications Table A-11: Temperature vs. Pressure Limits for JIS B2220 Flanges Temperature vs. Pressure Limits for JIS B2220 Flanges Pressure (Mpa) Flange material Flange rating ≤ 50 °C (122 °F) @ 120 °C (248 °F) Carbon steel 304 stainless steel (15 mm to 65 mm) 304 stainless steel (≤...
  • Page 187 Product Specifications AS4087 • PN16, PN21: 2-in. to 40-in., 48-in. (8-in. excluded) (50 mm to 1000 mm, 1200 mm) • PN35: 2-in. to 36-in. (8-in. excluded) (50 mm to 900 mm) GB/T9119 • PN10: 8- and 24-, 36-, 40-, 48-in. (200 mm to 600 mm, 900 mm, 1000 mm, 1200 mm) •...
  • Page 188 Product Specifications ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 189: Appendix B Product Certifications

    Product Certifications For detailed approval certification information and installation drawings, please see the appropriate document listed below: • Document number 00825-MA00-0004: Rosemount 8750W Approval Document - IECEx and ATEX • Document number 00825-MA00-0005: Rosemount 8750W Approval Document – Class Division •...
  • Page 190 Product Certifications ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 191: Appendix C Mobus Coil And Register Map

    Mobus Coil and Register Map Appendix C Mobus Coil and Register Map Here is a complete listing of the registers and coils available in the transmitter. Configuration details for a particular register or coil can be found elsewhere in this manual. Table C-1: Modbus registers Parameter...
  • Page 192 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Status Register 1 bit #0 - Internal Flow Simulation Test Error bit #1 - Excess Auto Zero Correction, ZR too Low bit #2 - Excess Auto Zero Correction, ZR too High bit #3 - Auto Zero attempt with Nonzero flow bit #4 - Totalizer Limit Alert 1...
  • Page 193 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Transmitter software revision – (xxxx.x format, e.g., 141 means rev 14.1) MODBUS Module software revision Display Type Internal Flow Simulator Value units Internal Flow Simulator Deviation units Coil Inductance Deviation Units Coil Inductance Units...
  • Page 194 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Base Reference Units Code for Special Units Coil Drive Frequency Signal Processing Status Digital Signal Processing Operating Mode Signal Processing Number of Samples Flow Display Configuration LOI Language Configuration LOI Display Auto Lock Configuration...
  • Page 195 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Modbus Baud Rate Modbus Parity Modbus Stop Bits LOI Auto Lock Time Manufacturers Device Type Code Manufacturers Id Code LOI Backlight Control Configuration Device Identification Number Primary Variable Sensor Serial Number Final Assembly Number...
  • Page 196 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Status Register 1 bit #0 - Internal Flow Simulation Test Error bit #1 - Excess Auto Zero Correction, ZR too Low bit #2 - Excess Auto Zero Correction, ZR too High bit #3 - Auto Zero attempt with Nonzero flow bit #4 - Totalizer Limit Alert 1...
  • Page 197 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Electronics Temperature Value Line Noise Value 5 Hz Signal to Noise Ratio (Value) 37 Hz Signal to Noise Ratio (Value) Signal Power Empty Pipe Value Electrode Coating Value...
  • Page 198 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Electrode Resistance Signature Value Flow Damping Value Conversion Factor for Special Units Low Flow Cutoff Value Pulse Scaling Factor Pulse Output Width (milliseconds) Universal Flow Rate Process Density Value Empty Pipe Trigger Level...
  • Page 199 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Slot 6 Transmitter Variable Index Slot 7 Transmitter Variable Index Slot 8 Transmitter Variable Index Slot 9 Transmitter Variable Index Slot 10 Transmitter Variable Index Slot 11 Transmitter Variable Index Slot 12 Transmitter Variable Index...
  • Page 200 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Status Register 0 bit #0 - Sensor Out of Range bit #1 - Empty Pipe Condition Detected bit #2 - I/O Processor Failure bit #3 - Pulse Output, Out of Range bit #4 - Update Missed bit #5 - Output at Alarm Level...
  • Page 201 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Status Register 2 bit #0 - Digital I/O 1 Active bit #1 - Digital Output 2 Active bit #2 - Diagnostic Status Alert Active bit #3 - Modbus in Listen Only mode bit #4 - I/O Processor Comm Failure bit #5 - Coil Over Current Detected...
  • Page 202 Mobus Coil and Register Map Table C-1: Modbus registers (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Slot 20 Transmitter Variable Slot 21 Transmitter Variable Slot 22 Transmitter Variable Slot 23 Transmitter Variable Slot 24 Transmitter Variable Slot 25 Transmitter Variable Slot 26 Transmitter Variable Slot 27 Transmitter Variable...
  • Page 203 Mobus Coil and Register Map Table C-2: Modbus coils (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Excess Auto Zero Correction, ZR too Low Excess Auto Zero Correction, ZR too High Auto Zero attempt with Nonzero flow Totalizer Limit Alert 1 Universal Trim Failure Flow Limit Alert 1...
  • Page 204 Mobus Coil and Register Map Table C-2: Modbus coils (continued) Parameter Work Level Write Pro- Register Description Type Access tect? License Status - Meter Verification License Status - Electrode Coating Enable/Disable Flow Limit Alert 1 Enable/Disable Flow Limit Alert 2 Enable/Disable Reverse Flow Lock/Unlock LOI Start/Stop All Totalizers...
  • Page 205 Mobus Coil and Register Map Table C-2: Modbus coils (continued) Parameter Work Level Write Pro- Register Description Type Access tect? Enable/Disable Diagnostic Status Alert - Empty Pipe Enable/Disable Diagnostic Status Alert - Reverse Flow Enable/Disable Diagnostic Status Alert - Ground/ Wiring Fault Enable/Disable Diagnostic Status Alert - High Process Noise...
  • Page 206 Mobus Coil and Register Map ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...

  • Page 207: Appendix D Wiring Diagrams

    Wiring Diagrams Appendix D Reference manual...

  • Page 208: Installation And Wiring Drawings

    Wiring Diagrams Wiring Diagrams Installation and wiring drawings ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 209 Wiring Diagrams Reference manual...
  • Page 210 Wiring Diagrams ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 211 Wiring Diagrams Reference manual...
  • Page 212 Wiring Diagrams ® Rosemount 8750W Transmitter with Modbus Protocol Reference Manual...
  • Page 213 Wiring Diagrams Reference manual...
  • Page 214 © 2018 Rosemount, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. Rosemount, 8600, 8700, 8800 marks are marks of one of the Emerson Automation Solutions family of companies. All other marks are property of their respective owners.

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