Emerson Micro Motion GDM Installation Manual
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Emerson Micro Motion GDM Installation Manual

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Installation Manual
MMI-20020979, Rev AB
May 2015
®
Micro Motion
Gas Density Meters (GDM)
Fiscal gas density measurement

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Summary of Contents for Emerson Micro Motion GDM

  • Page 1 Installation Manual MMI-20020979, Rev AB May 2015 ® Micro Motion Gas Density Meters (GDM) Fiscal gas density measurement...
  • Page 2 Micro Motion procedures will result in your equipment being refused delivery. Information on return procedures and forms is available on our web support system at www.micromotion.com, or by phoning the Micro Motion Customer Service department. Emerson Flow customer service Email: •...

  • Page 3: Table Of Contents

    Contents Contents Chapter 1 Planning ...........................1 Installation checklist ........................1 Best practices ..........................2 Recommended sample flow rate ....................3 Power requirements ........................4 Installation requirements for the thermo-well pocket ..............5 Recommended installations for gas density applications ..............6 Perform a pre-installation meter check ..................14 Chapter 2 Mounting ........................
  • Page 4 Contents Micro Motion ® Gas Density Meters...

  • Page 5: Planning

    Planning Planning Topics covered in this chapter: • Installation checklist • Best practices • Recommended sample flow rate • Power requirements • Installation requirements for the thermo-well pocket • Recommended installations for gas density applications • Perform a pre-installation meter check Installation checklist □...

  • Page 6: Best Practices

    Planning □ Make sure that the process gas meets the recommended characteristics regarding composition, temperature, and pressure for your installation. □ Verify that you have all equipment necessary for your installation. Depending on your application, you may be required to install additional parts for optimal performance of the meter.

  • Page 7: Recommended Sample Flow Rate

    Planning Recommended sample flow rate Use the smallest acceptable flow rate for the process gas passing through the meter. This ensures a sample gas flow rate that is representative of the main flow with regard to the proportions of different gas constituents. Micro Motion recommends a gas flow rate of 5 ±1 l/hr (0.176 ±0.35 ft /hr), although a flow rate between 1 to 10 l/hr (0.035 to 0.35 ft...

  • Page 8: Power Requirements

    Planning Power requirements Following are the DC power requirements to operate the meter: • 24 VDC, 0.45 W maximum • Minimum 22.8 VDC with 1000 m (3280 ft) of 0.20 mm (18 AWG) power-supply cable • At startup, power source must provide a minimum of 0.5 A of short-term current at a minimum of 19.6 V at the power-input terminals.

  • Page 9: Installation Requirements For The Thermo-Well Pocket

    Micro Motion provides thermo-well pocket installation kits for purchase. Contact your local sales representative or Micro Motion Customer Support at flow.support@emerson.com for more information. A thermo-well pocket installation requires the following, before you can mount and...

  • Page 10: Recommended Installations For Gas Density Applications

    Planning Figure 1-4: Micro Motion thermo-well pocket dimensions inches Dimensions in (mm) Ø3.94 (100.00) 6.00 (152.30) 1.59 (40.30) 2.83 (72.00) Recommended installations for gas density applications Micro Motion recommends specific installations for the GDM depending on the gas density application – as defined by international standards, ISO 5167 and AGA 3. This information is provided for your reference only.
  • Page 11 Planning Meter installation in a pressure recovery application The most common location for a density device in an orifice plate metering system is downstream from the orifice plate. This installation is commonly referred to as the pressure recovery method. The pressure recovery method allows an optimal gas flow rate, and provides easy access for checking filters and verifying the meter calibration.
  • Page 12 Planning Figure 1-5: Meter installation in pressure recovery application STATUS SCROLL SELECT Meter isolation valves Flowmeter Venting valve Flow control needle valve Filter Pipeline diameter Differential pressure transmitter Density point Distance is eight times the pipeline diameter Thermal insulation Vent/vacuum test point Note Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter housing.
  • Page 13 Planning • Pressure drops through the valves and filters do not affect the reading. The pressure inside the meter and at the gas outlet is equal to the pressure at the orifice downstream point. • The correct expansion factor for the downstream point is used in the orifice flow calculations.
  • Page 14 Planning Figure 1-6: Meter installation in differential pressure application STATUS SCROLL SELECT Meter isolation valves Flowmeter Venting valve Flow control needle valve Filter Differential pressure transmitter Thermal insulation Vent/vacuum test point Note Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter housing.
  • Page 15 Planning To avoid excessive pressure drops in your sample pipeline, be sure to monitor the condition of the filters. Do this by varying the sample flow rate and monitoring the magnitude of the resultant density changes. Pressure drops through the filters can cause density errors if they become too large. 1.6.2 Meter installation in a vented gas application The vented gas method allows the gas to be vented to flare or, in some cases, to...
  • Page 16 Planning Figure 1-7: Meter installation in a vented gas application STATUS SCROLL SELECT Meter isolation valves Flowmeter Venting valve Flow control needle valve Filter Pressure regulator Thermal insulation Vent/vacuum test point Low-pressure vent system connection point Note Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter housing.
  • Page 17 Planning Figure 1-8: Meter installation in an ultrasonic meter application STATUS SCROLL SELECT Meter isolation valves Flowmeter Venting valve Flow control needle valve Filter Annubar flowmeter Thermal insulation Vent/vacuum test point Note Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter housing.

  • Page 18: Perform A Pre-Installation Meter Check

    Planning Figure 1-9: Meter installation with a turbine flow meter STATUS SCROLL SELECT Meter isolation valves Flowmeter Venting valve Flow control needle valve Filter Turbine flowmeter Thermal insulation Vent/vacuum test point Note Do not insulate the transmitter (electronics) and maintain a nominal 1-in clearance between the insulation and the transmitter housing.
  • Page 19 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 20: Chapter 2 Mounting

    Mounting Mounting Topics covered in this chapter: • Mount the meter in the pipeline • Connect the gas bypass lines • Rotate the electronics on the meter (optional) • Rotate the display on the transmitter (optional) • Post-installation check Mount the meter in the pipeline Prerequisites Important Micro Motion recommends that you install the meter in a thermo-well pocket to maintain...
  • Page 21 Mounting Figure 2-1: Meter installation pieces STATUS SCROLL SELECT M8 socket-head cap screw (for mounting) Meter housing Aluminum sleeve (cylinder) Anti-vibration gasket Thermo-well pocket Procedure (Recommended) Install the thermo-well pocket in the aperture created in the pipeline and weld it into place. Pour the supplied silicon fluid (an amount of 20 cm ) into the interior of the pocket.

  • Page 22: Connect The Gas Bypass Lines

    Mounting Figure 2-2: Typical installation in pipeline (with thermo-well pocket) Dimensions in inches (mm) STATUS SCROLL SELECT 3.74 (95) Connect the gas bypass lines Once you have mounted the meter in the pipeline, you are ready to connect the gas bypass lines.
  • Page 23 Mounting Figure 2-3: Gas inlet/outlet connectors STATUS SCROLL SELECT A. Process gas outlet B. Process gas inlet C. Filter Installation Manual...

  • Page 24: Rotate The Electronics On The Meter (Optional)

    Mounting Rotate the electronics on the meter (optional) You can rotate the transmitter on the meter up to 90°. Using a 4 mm hex key, loosen the cap screw that holds the transmitter in place. Figure 2-4: Component to secure transmitter in place A.
  • Page 25 Mounting Figure 2-5: 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.

  • Page 26: Post-Installation Check

    Mounting Post-installation check After you complete the installation of the meter, pressure test the meter and associated pipework to 1½ times the maximum operating pressure. Micro Motion ® Gas Density Meters...

  • Page 27: Chapter 3 Wiring

    Wiring Wiring Topics covered in this chapter: • Available output terminals and wiring requirements • Hazardous area output wiring Available output terminals and wiring requirements Three pairs of wiring terminals are available for transmitter outputs. These outputs vary depending on your transmitter output option ordered. The Analog (mA), Time Period Signal (TPS), and Discrete (DO) outputs require external power, and must be connected to an independent 24 VDC power supply.
  • Page 28 Wiring Information provided about wiring the safety barriers and galvanic isolators is intended as an overview. You should wire the meter according to the standards that are applicable at your site. CAUTION! • Meter installation and wiring should be performed by suitably trained personnel only in accordance with the applicable code of practice.
  • Page 29 Wiring Table 3-3: 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 30 Wire all available 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 Micro Motion Customer Support at flow.support@emerson.com for more information on ordering a barrier kit. CAUTION! •...
  • Page 31 Micro Motion provides a galvanic isolator installation kit specific to wiring the Analog version of the meter in a hazardous area. Contact your local sales representative or Micro Motion Customer Support at flow.support@emerson.com for more information on ordering an isolator kit for your meter.
  • Page 32 Wiring CAUTION! • 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 Micro Motion Product Documentation DVD and accessible on the Micro Motion website at www.micromotion.com.
  • Page 33 Micro Motion provides a galvanic isolator installation kit specific to wiring the Time Period Signal (TPS) and Discrete versions of the meter in a hazardous area. Contact your local sales representative or Micro Motion Customer Support at flow.support@emerson.com more information on ordering an isolator kit for your meter. CAUTION! •...
  • Page 34 Wiring Note The RS-485 barrier is not isolated. Output(s) Isolator 4–20 mA + HART MTL5541 • Time Period Signal (TPS) MTL5532 • Discrete Modbus/RS-485 MTL7761AC Power MTL5523 Procedure Wire the isolators to the appropriate output terminal and pins. Figure 3-3: Hazardous area output wiring using galvanic isolators (TPS and Discrete output options) Hazardous Area Non-Hazardous Area...
  • Page 35 Wiring 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). Figure 3-4: MTL5532 switch location (plus ON/OFF switch position) 1 2 3 4 Table 3-4: MTL5532 switch settings Switch ON/OFF?

  • Page 36: Chapter 4 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 37 Grounding Installation Manual...
  • Page 38 © Micro Motion Japan 2015 Micro Motion, Inc. All rights reserved. Emerson Process Management The Emerson logo is a trademark and service mark of Emerson 1-2-5, Higashi Shinagawa Electric Co. Micro Motion, ELITE, ProLink, MVD and MVD Direct Shinagawa-ku Connect marks are marks of one of the Emerson Process Tokyo 140-0002 Japan Management family of companies.

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