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Summary of Contents for Emerson Micro Motion 7835
- Page 1 Installation Manual MMI-20020999, Rev AC May 2018 ® Micro Motion Compact Density Meter (CDM) 7835/7845 Liquid Density Meter Retrofit Installation...
- Page 2 Micro Motion employees. Micro Motion will not accept your returned equipment if you fail to follow Micro Motion procedures. Return procedures and forms are available on our web support site at www.emerson.com, or by phoning the Micro Motion Customer Service department.
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Page 3: Table Of Contents
Contents Contents Chapter 1 Planning ...........................1 Retrofit installation overview ......................1 Installation checklist ........................1 Best practices ..........................2 Pressure drop in the meter ......................3 Power requirements ........................5 Spacing requirements ........................9 Perform a pre-installation meter check ..................11 Chapter 2 Removing a 7835/7845 meter ..................12 Disconnect the 7835/7845 meter wiring ..................12 Remove the meter from the pipeline ....................14 Chapter 3... - Page 4 Contents Micro Motion Compact Density Meter 7835/7845 Retrofit...
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Page 5: Chapter 1 Planning
Retrofit installation overview Following is an overview of the tasks required to install the Compact Density Meter (CDM) as a replacement to the Micro Motion 7835/7845 liquid density meter. We recommend that you review this information before beginning the retrofit installation. -
Page 6: Best Practices
Micro Motion provides safety barrier and galvanic isolator installation kits for wiring the CDM in a hazardous environment. These kits provide the appropriate barriers or isolators depending on the outputs available and approvals required. Contact flow.support@emerson.com for more information on ordering these kits. □... -
Page 7: Pressure Drop In The Meter
The pressure drop in the meter depends on the process conditions. The following figures illustrate the pressure drop for the meter at varying fluid density and viscosity. In addition, these charts show how the meter compares to the Micro Motion 7835/7845 liquid density meters. - Page 8 Planning Figure 1-1: Sample pressure drop calculations (fluid viscosity equals 2 cP) Pressure drop (bar) Flow rate (m /hr) Note • Density = 800 kg/m • Viscosity = 2 cP Micro Motion Compact Density Meter 7835/7845 Retrofit...
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Page 9: Power Requirements
Planning Figure 1-2: Sample pressure drop calculations (fluid viscosity equals 10 cP) Pressure drop (bar) Flow rate (m /hr) Note • Density = 800 kg/m • Viscosity = 10 cP Power requirements Following are the DC power requirements to operate the meter: •... - Page 10 Planning Power cable recommendations for explosion-proof/flameproof meters Figure 1-3: Minimum wire gauge (AWG per feet ) 2 1 . 6V 24 V 300ft 600ft 900ft 1200ft 1500ft 1800ft 2100ft 2400ft 2700ft 3000ft 91.44m 182.88m 274.32m 365.76m 457.2m 548.64m 640.08m 731.52m 822.96m 914.4m AWG maximum Distance of installation Micro Motion Compact Density Meter 7835/7845 Retrofit...
- Page 11 Planning Figure 1-4: Minimum wire area (mm per meter) 0.700 0.600 0.500 0.400 2 1 . 6V 0.300 24 V 0.200 0.100 0 . 00 0 10 0m 20 0m 30 0m 40 0m 50 0m 60 0m 70 0m 80 0m 90 0m 100 0m 328.084 ft...
- Page 12 Planning Power cable recommendations for intrinsically safe meters Figure 1-5: Minimum wire gauge (AWG per feet) 22 . 8 V 24 V 3 0 0 6 0 0 9 0 0 12 0 0 1 50 0 18 0 0 21 0 0 24 0 0 27 0 0...
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Page 13: Spacing Requirements
Planning Figure 1-6: Minimum wire area (mm per meter) Minimum wire area (mm Distance of installation Spacing requirements When determining spacing requirements, be sure to consider the height requirements of the CDM in relation to the existing 7835/7845 meter (see Figure 1-8). - Page 14 Planning Figure 1-7: CDM retrofit meter dimensions Dim. A — face to face is up to 40.4 inches (1026 mm) ± 0.125 in (3 mm) Nominal flow direction — the meter can be configured for normal (forward), reversed, or bi- directional flow 2x 1/2-14 NPT female electronic interface Note...
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Page 15: Perform A Pre-Installation Meter Check
Visually inspect the meter for any physical damage. If you notice any physical damage to the meter, immediately contact Micro Motion Customer Support at flow.support@emerson.com. Position and secure the meter in a vertical position with the flow arrow pointing upward. -
Page 16: Removing A 7835/7845 Meter
Removing a 7835/7845 meter Removing a 7835/7845 meter Topics covered in this chapter: • Disconnect the 7835/7845 meter wiring • Remove the meter from the pipeline Disconnect the 7835/7845 meter wiring Prerequisites • Be prepared to manually record the existing wiring connections to the 7835/7845 meter. - Page 17 Removing a 7835/7845 meter Figure 2-1: Standard electronics terminal locations Figure 2-2: Advanced electronics terminal locations Disconnect wiring from the meter. Installation Manual...
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Page 18: Remove The Meter From The Pipeline
Removing a 7835/7845 meter Remove the meter from the pipeline Prerequisites Before you loosen or remove any connection, depressurize and drain the meter in accordance with the applicable codes of practice. CAUTION! You must take suitable precautions to ensure your safety if the equipment has come into contact with aggressive substances. -
Page 19: Chapter 3 Mounting
Mounting Mounting Topics covered in this chapter: • Mount the meter • Rotate the electronics on the meter (optional) • Rotate the display on the transmitter (optional) Mount the meter Use your common practices to minimize torque and bending load on process connections. To reduce the risk of condensation or excessive moisture, the transmitter conduit opening should not point upward (if possible). -
Page 20: Rotate The Electronics On The Meter (Optional)
Mounting Figure 3-1: Mounting the sensor Notes • Do not use the meter to support the piping. • The meter does not require external supports. The flanges will support the meter in any orientation. • All pipework joints and couplings must be airtight to minimize the presence of gas bubbles in the fluid. -
Page 21: Rotate The Display On The Transmitter (Optional)
Mounting Figure 3-2: Component to secure transmitter in place A. M5 socket-head cap screw Rotate the transmitter clockwise to the desired orientation up to 90°. Secure the cap screw in place and tighten to 60 lb·in (6.8 N·m). Rotate the display on the transmitter (optional) The display on the transmitter electronics module can be rotated 90°... - Page 22 Mounting Figure 3-3: Display components Transmitter housing Sub-bezel Display module Display screws Display cover Procedure If the meter is powered up, power it down. Turn the display cover counterclockwise to remove it from the main enclosure. Carefully loosen (and remove if necessary) the semi-captive display screws while holding the display module in place.
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Page 23: Chapter 4 Wiring
Wiring Wiring Topics covered in this chapter: • Wiring to external devices (HART multidrop) • Terminals and wiring requirements • Retrofit wiring: terminal-to-output conversions • Explosion-proof/flameproof or non-hazardous output wiring • Intrinsically safe output wiring ™ Processor wiring for remote-mount 2700 FOUNDATION fieldbus option •... -
Page 24: Retrofit Wiring: Terminal-To-Output Conversions
Wiring Table 4-1: Transmitter outputs Output channels Transmitter version Analog 4–20 mA + HART 4–20 mA Modbus/RS-485 Time period signal (TPS) 4–20 mA + HART Time Period Sig- Modbus/RS-485 nal (TPS) Discrete 4–20 mA + HART Discrete output Modbus/RS-485 Processor for remote-mount Model Disabled Disabled Modbus/RS-485... - Page 25 Wiring Take the wire from terminal ...and, connect it to the CDM output ter- Function pin: minal: Temperature Signal converter/flow comput- Two wires from the signal converter/flow er terminals for temperature computer connect to: (See the signal converter/flow • mA 1 + computer manual for more in- •...
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Page 26: Explosion-Proof/Flameproof Or Non-Hazardous Output Wiring
Wiring Take the wire from terminal ...and, connect it to the CDM output ter- Function pin: minal: Analog 2 Pin 5 mA 2 + Pin 6 mA 2 – Power supply Pin 7 PWR + Pin 8 PWR – Remote display Pin 9 If you purchased a CDM with an integral transmitter and display, the Remote Dis-... - Page 27 Wiring Figure 4-1: Wiring the Analog outputs mA1+ HART RS-485 A RS-485 RS-485 B A. 24 VDC B. R (250 Ω resistance) load C. HART-compatible host or controller; and/or signal device D. Signal device Note For operating the milliamp outputs with a 24V supply, a maximum total loop resistance of 657 Ω is allowed.
- Page 28 Wiring 4.4.2 Wire the Time Period Signal (TPS) or Discrete output version in an explosion-proof/flameproof or non- hazardous area CAUTION! Meter installation and wiring should be performed by suitably trained personnel only in accordance with the applicable code of practice. Procedure Wire to the appropriate output terminal and pins (see Figure...
- Page 29 Wiring Figure 4-2: Wiring the TPS or Discrete output version mA1+ HART TPS/DO RS-485 A RS-485 RS-485 B A. 24 VDC B. R (250 Ω resistance) load C. HART-compatible host or controller; and/or signal device (500 Ω resistance recommended) D. R load E.
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Page 30: Intrinsically Safe Output Wiring
Meter installation and wiring should be performed by suitably trained personnel only in accordance with the applicable code of practice. • Refer to the hazardous area approvals documentation shipped with your meter. Safety instructions are available on the Product Documentation DVD and accessible at www.emerson.com. 4.5.1 Hazardous area entity parameters DANGER! •... - Page 31 Wiring Table 4-3: RS-485 output and cable entity parameters (MTL7761AC) Input parameters Voltage (U 18 VDC Current (I 100 mA Internal capacitance (C 1 nF Internal inductance (L 0.0 H Output parameters Voltage (U 9.51 VDC Current (instantaneous) (I 480 mA Current (steady state) (I) 106 mA Power (P...
- Page 32 Wire all intrinsically safe outputs using safety barriers Micro Motion provides a safety barrier installation kit for wiring the meter in a hazardous area. Contact your local sales representative or customer support at flow.support@emerson.com for more information on ordering a barrier kit. CAUTION! •...
- Page 33 Wiring Figure 4-3: Intrinsically safe mA/DO/TPS output wiring using safety barriers Hazardous Area Non-Hazardous Area mA1+ MTL7728P+ 250 Ω HART 24 VDC mA2/ MTL7728P+ TPS/DO 24 VDC RS-485 A RS-485 MTL7761AC RS-485 B 24 VDC MTL7728P+ A. HART/Field Communicator device B.
- Page 34 Refer to the hazardous area approvals documentation shipped with your meter. Safety instructions are available on the Micro Motion Product Documentation DVD and accessible on the Micro Motion website at www.emerson.com. The galvanic isolator kit (Analog version) provides isolators for connecting the following outputs.
- Page 35 Wiring Figure 4-4: Intrinsically safe output wiring using galvanic isolators (mA outputs option) Hazardous Area Non-Hazardous Area 24 VDC mA1+ HART 250 Ω 24 VDC 250 Ω RS-485 A RS-485 RS-485 B 24 VDC LINK A. HART/Field Communicator device B. Signal device CAUTION! •...
- Page 36 Refer to the hazardous area approvals documentation shipped with your meter. Safety instructions are available on the Micro Motion Product Documentation DVD and accessible on the Micro Motion website at www.emerson.com. The galvanic isolator kit (TPS/Discrete version) provides isolators for connecting the following outputs.
- Page 37 Wiring Figure 4-5: Hazardous area output wiring using galvanic isolators (TPS and Discrete output options) Hazardous Area Non-Hazardous Area 24 VDC mA1+ HART 250 Ω 1 kΩ 1 kΩ TPS/DO 24 VDC RS-485 A RS-485 RS-485 B 24 VDC LINK A.
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Page 38: Processor Wiring For Remote-Mount 2700 Foundation Fieldbus Option
Wiring Set the isolator switch settings for the TPS/DO connection (MTL5532 isolator). You must set the isolator switches appropriately for Pins 1 through 5 (see Table 4-4). The switches are located on the side of the isolator, and must be set to either Off (the up position) or On (the down position). - Page 39 Wiring DANGER! Improper wiring in a hazardous environment can cause an explosion. Install the meter only in an area that complies with the hazardous classification tag on the meter. Table 4-5: RS-485 output and cable entity parameters Cable parameters for intrinsically safe circuit (linear) Voltage (U 17.22 VDC Current (I...
- Page 40 Wiring • Applicable hazardous area requirements, if the core processor is installed in a hazardous area. • Wire gauge appropriate for the cable length between the core processor and the transmitter. • Wire gauge of 22 AWG or larger, with a maximum cable length of 1000 feet. Prepare a cable with a metal conduit Prerequisites Note...
- Page 41 Wiring Strip the cable jacket. Option Description NPT gland type Strip 4-1/2 inch (115 mm) M20 gland type Strip 4-1/4 inch (108 mm) Remove the clear wrap and filler material. Strip most of the shielding. Option Description NPT gland type Strip all but 3/4 inch (19 mm) M20 gland type Strip all but 1/2 inch (12 mm)
- Page 42 Wiring Option Description Trim 0.3 in (7 mm). gland type A. Trim Assemble the gland by folding the shield or braid back over the clamping insert and 1/8 inch (3 mm) past the O-ring. A. Shield folded back Install the gland body into the conduit opening on the core processor housing. Insert the wires through the gland body and tighten the gland nut onto the gland body.
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Page 43: Wiring To Signal Converters And/Or Flow Computers
Wiring Figure 4-7: Processor (Modbus/RS-485) connections to the remote-mount 2700 FF transmitter White wire to RS-485/A terminal Green wire to RS-485/B terminal Red wire to Power supply (+) terminal Black wire to Power supply (–) terminal Important • To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the meter be connected using a suitable instrumentation cable. - Page 44 Wiring 4.7.1 Wire to a signal converter/flow computer in an explosion-proof/flameproof or non-hazardous area Figure 4-8: Wiring to a signal converter/flow computer in an explosion-proof/ flameproof or non-hazardous area mA1+ HART RS-485 A RS-485 RS-485 B 24 VDC Active HART host Active signal converter/flow computer CAUTION! •...
- Page 45 Wiring 4.7.2 Wire to a signal converter/flow computer in an intrinsically safe area Figure 4-9: Wiring to a signal converter/flow computer in an intrinsically safe area Hazardous Area Non-Hazardous Area mA1+ HART RS-485 A RS-485 RS-485 B 24 VDC Active HART host Active signal converter/flow computer CAUTION! •...
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Page 46: Chapter 5 Grounding
Grounding Grounding The meter must be grounded according to the standards that are applicable at the site. The customer is responsible for knowing and complying with all applicable standards. Prerequisites Micro Motion suggests the following guides for grounding practices: • In Europe, EN 60079-14 is applicable to most installations, in particular Sections 12.2.2.3 and 12.2.2.4. - Page 47 Grounding Installation Manual...
- Page 48 © 2018 Micro Motion, Inc. All rights reserved. The Emerson logo is a trademark and service mark of Emerson Electric Co. Micro Motion, ELITE, ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Automation Solutions family of companies. All other marks are property of their respective owners.