Installation Manual MMI-20020979, Rev AB May 2015 Micro Motion® Gas Density Meters (GDM) Fiscal gas density measurement
Safety and approval information This Micro Motion product complies with all applicable European directives when properly installed in accordance with the instructions in this manual. Refer to the EC declaration of conformity for directives that apply to this product. The EC declaration of conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available on the internet at www.micromotion.com or through your local Micro Motion support center.
Contents Contents Chapter 1 Planning ...........................................................................................................................1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Chapter 2 Mounting ....................................................................................................................... 16 2.1 2.2 2.3 2.4 2.5 Chapter 3 Mount the meter in the pipeline ...................................................................................................
Contents ii Micro Motion® Gas Density Meters
Planning 1 Planning Topics covered in this chapter: 1.1 • • • • 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 □ Verify the contents of the product shipment to confirm that you have all parts and information necessary for the installation.
Planning 1.2 □ 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. □ Follow recommended best practices for installing the GDM to account for the effects of density, temperature, and pressure equilibrium.
Planning 1.3 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 ft3/hr), although a flow rate between 1 to 10 l/hr (0.035 to 0.35 ft3/hr) is acceptable. At flow rates greater than 10 l/hr (0.
Planning 1.4 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 mm2 (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. Power cable recommendations Figure 1-2: Minimum wire gauge (AWG per feet) Minimum Wire Gauge 26 25 24 23 AWG 22 21 20 22.
Planning Figure 1-3: Minimum wire area (mm2 per meter) Minimum Wire Area (mm2) Minimum Wire Area (mm2) 0.900 0.850 0.800 0.750 0.700 0.650 0.600 0.550 0.500 0.450 0.400 0.350 0.300 0.250 0.200 0.150 0.100 0.050 0.000 100 22.8V 24V 200 300 400 500 600 700 800 900 1000 Distance of Installation (m) 1.5 Installation requirements for the thermo-well pocket Installation of the GDM in a thermo-well pocket helps maintain temperature equilibrium between the sample gas and pipeline gas.
Planning Figure 1-4: Micro Motion thermo-well pocket dimensions Dimensions in inches (mm) Ø3.94 (100.00) 6.00 (152.30) 1.59 (40.30) 2.83 (72.00) 1.6 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. 1.6.
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. Tip Use 6-mm (1/4-in) instrument tubing for the gas input pipework.
Planning Figure 1-5: Meter installation in pressure recovery application J K C GDM B A A D STATUS E SCROLL SELECT H I F G A. B. C. D. E. F. G. H. I. J. K.
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. • The measured density at the density point is used in the mass flow calculation, as defined by ISO 5167 and AGA 3.
Planning Figure 1-6: Meter installation in differential pressure application H G C GDM B STATUS A E SCROLL SELECT D A F A. B. C. D. E. F. G. H. 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.
Planning Tip 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 atmosphere.
Planning Figure 1-7: Meter installation in a vented gas application H I G C GDM A A. B. C. D. E. F. G. H. I. B A F E D 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. 1.6.
Planning Figure 1-8: Meter installation in an ultrasonic meter application G H C B A E GDM F STATUS SCROLL A A. B. C. D. E. F. G. H. SELECT D 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. 1.6.
Planning Figure 1-9: Meter installation with a turbine flow meter H G C D E B GDM A STATUS SCROLL SELECT A F A. B. C. D. E. F. G. H. 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. 1.7 Perform a pre-installation meter check 1. 14 Remove the meter from the box.
Planning CAUTION! Handle the meter with care. Follow all corporate, local, and national safety regulations for lifting and moving the meter. 2. 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. 3. Position and secure the meter in a vertical position with the flow arrow pointing upward. 4. Connect the power wiring, and power up the meter.
Mounting 2 Mounting Topics covered in this chapter: 2.1 • • • • 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 temperature equilibrium between the sample gas and the pipeline gas.
Mounting Figure 2-1: Meter installation pieces STATUS SCROLL SELECT A B C D E A. B. C. D. E. M8 socket-head cap screw (for mounting) Meter housing Aluminum sleeve (cylinder) Anti-vibration gasket Thermo-well pocket Procedure 1. (Recommended) Install the thermo-well pocket in the aperture created in the pipeline and weld it into place. 2. Pour the supplied silicon fluid (an amount of 20 cm3) into the interior of the pocket. 3. Place one 5-mm anti-vibration gasket on top of the pocket.
Mounting Figure 2-2: Typical installation in pipeline (with thermo-well pocket) Dimensions in inches (mm) STATUS SCROLL SELECT 3.74 (95) 2.2 Connect the gas bypass lines Once you have mounted the meter in the pipeline, you are ready to connect the gas bypass lines. Adjacent to the gas connection ports, the meter provides two filters to ensure optimal performance of the meter sensing element.
Mounting Figure 2-3: Gas inlet/outlet connectors STATUS SCROLL SELECT C A B A. Process gas outlet B. Process gas inlet C.
Mounting 2.3 Rotate the electronics on the meter (optional) You can rotate the transmitter on the meter up to 90°. 1. 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 A. M5 socket-head cap screw 2.4 2. Rotate the transmitter clockwise to the desired orientation up to 90°. 3. Secure the cap screw in place and tighten to 60 lb·in (6.8 N·m).
Mounting Figure 2-5: Display components A B C D E D A. B. C. D. E. Transmitter housing Sub-bezel Display module Display screws Display cover Procedure 1. If the meter is powered up, power it down. 2. Turn the display cover counterclockwise to remove it from the main enclosure. 3. Carefully loosen (and remove if necessary) the semi-captive display screws while holding the display module in place. 4.
Mounting 2.5 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.
Wiring 3 Wiring Topics covered in this chapter: • • 3.1 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.
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! 3.2.1 • 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.
Wiring Table 3-3: RS-485 output and cable entity parameters (MTL7761AC) Input parameters Voltage (Ui) 18 VDC Current (Ii) 100 mA Internal capacitance (Ci) 1 nF Internal inductance (Li) 0.0 H Output parameters Voltage (Uo) 9.51 VDC Current (instantaneous) (Io) 480 mA Current (steady state) (I) 106 mA Power (Po) 786 mW Internal resistance (Ri) 19.
Wiring 3.2.2 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! • Meter installation and wiring should be performed by suitably trained personnel only in accordance with the applicable code of practice.
Wiring Figure 3-1: Hazardous area mA/DO/TPS output wiring using safety barriers Hazardous Area Non-Hazardous Area Bus Bar 3 mA1+ HART 1 250 Ω MTL7728P+ 4 2 HART Device 24 VDC 3 mA2/ TPS/DO 1 See note MTL7728P+ 4 2 Signal Device 24 VDC RS-485 A B PWR 3 1 MTL7761AC 4 2 3 RS-485 A RS-485 B 1 MTL7728P+ 4 2 24 VDC Note The recommended resistance will vary depending on your Channel B output. For mA outputs, 250 Ω is the recommended resistance.
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. The galvanic isolator kit (Analog version) provides isolators for connecting the following outputs.
Wiring Figure 3-2: Hazardous area output wiring using galvanic isolators (mA outputs option) Hazardous Area Non-Hazardous Area mA1+ HART 1 MTL5541 14 2 13 24 VDC 12 250 Ω 11 HART Device mA2 1 MTL5541 14 2 13 24 VDC 12 250 Ω RS-485 A B 3 4 MTL7761AC 11 MTL5523 1 1 RS-485 A 2 RS-485 B 14 2 PWR 13 12 11 3.2.
Wiring Note The RS-485 barrier is not isolated. Output(s) Isolator 4–20 mA + HART MTL5541 • Time Period Signal (TPS) • Discrete MTL5532 Modbus/RS-485 MTL7761AC Power MTL5523 Procedure 1. Wire the isolators to the appropriate output terminal and pins.
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).
Grounding 4 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. • In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associated applications and requirements.
Grounding Installation Manual 33
*MMI-20020979* MMI-20020979 Rev AB 2015 Micro Motion Inc. USA Worldwide Headquarters 7070 Winchester Circle Boulder, Colorado 80301 T +1 303-527-5200 T +1 800-522-6277 F +1 303-530-8459 www.micromotion.com Micro Motion Europe Emerson Process Management Neonstraat 1 6718 WX Ede The Netherlands T +31 (0) 70 413 6666 F +31 (0) 318 495 556 www.micromotion.
