Emerson Micro Motion GDM User manual

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.
Information affixed to equipment that complies with the Pressure Equipment Directive can be found on the internet at
www.micromotion.com/documentation.
For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.
Other information
Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the transmitter
configuration manual. Product data sheets and manuals are available from the Micro Motion web site at
www.micromotion.com/documentation.
Return policy
Micro Motion procedures must be followed when returning equipment. These procedures ensure legal compliance with
government transportation agencies and help provide a safe working environment for Micro Motion employees. Failure to follow
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:
•Worldwide: [email protected]
•Asia-Pacific: [email protected]
Telephone:
North and South America Europe and Middle East Asia Pacific
United States 800-522-6277 U.K. 0870 240 1978 Australia 800 158 727
Canada [phone] The Netherlands [phone] New Zealand 099 128 804
Mexico [phone] France 0800 917 901 India 800 440 1468
Argentina [phone] Germany 0800 182 5347 Pakistan 888 550 2682
Brazil [phone] Italy 8008 77334 China [phone]
Venezuela [phone] Central & Eastern [phone] Japan [phone]
Russia/CIS [phone] South Korea [phone]
Egypt 0800 000 0015 Singapore [phone]
Oman 800 70101 Thailand 001 800 441 6426
Qatar 431 0044 Malaysia 800 814 008
Kuwait 663 299 01
South Africa 800 991 390
Saudi Arabia 800 844 9564
UAE 800 0444 0684

Contents
Chapter 1 Planning ...........................................................................................................................1
1.1 Installation checklist .......................................................................................................................1
1.2 Best practices .................................................................................................................................2
1.3 Recommended sample flow rate ....................................................................................................3
1.4 Power requirements .......................................................................................................................4
1.5 Installation requirements for the thermo-well pocket .................................................................... 5
1.6 Recommended installations for gas density applications ................................................................6
1.7 Perform a pre-installation meter check .........................................................................................14
Chapter 2 Mounting .......................................................................................................................16
2.1 Mount the meter in the pipeline ...................................................................................................16
2.2 Connect the gas bypass lines ........................................................................................................18
2.3 Rotate the electronics on the meter (optional) .............................................................................20
2.4 Rotate the display on the transmitter (optional) ...........................................................................20
2.5 Post-installation check ................................................................................................................. 22
Chapter 3 Wiring ........................................................................................................................... 23
3.1 Available output terminals and wiring requirements .................................................................... 23
3.2 Hazardous area output wiring ...................................................................................................... 23
Chapter 4 Grounding ......................................................................................................................32
Contents
Installation Manual i

Contents
ii Micro Motion® Gas Density Meters

1 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
1.1 Installation checklist
□Verify the contents of the product shipment to confirm that you have all parts and
information necessary for the installation.
Part Quantity
Micro Motion® Gas Density Meter (GDM) 1
Accessories kit:
-M20 to 1/2-inch NPT adapter (if applicable)
-1/2-inch NPT blanking plug
-2.5 mm hex key
1
Aluminum sleeve 1
Silicon fluid 1
Thermo-well pocket kit (if applicable) 1
Calibration certificate 1
Safety instructions booklets 2
Micro Motion Product Documentation DVD 1
□Make sure that all electrical safety requirements are met for the environment in
which the meter will be installed.
□Make sure that the local ambient and process temperatures and process pressure
are within the limits of the meter.
□Make sure that the hazardous area specified on the approval tag is suitable for the
environment in which the meter will be installed.
□If installing the meter in a hazardous area, confirm that you have the required safety
barriers or galvanic isolators for your installation.
□Make sure that you will have adequate access to the meter for verification and
maintenance.
Planning
Installation Manual 1

□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.
1.2 Best practices
The following information can help you get the most from your meter.
•Handle the meter with care. Follow local practices for lifting or moving the meter.
•Ensure that the process gas is clean and dry.
•Do not use gases incompatible with the materials of construction. To prevent
corrosion of the sensing element, the process gas should be compatible with
Ni-Span-C.
•Do not expose the meter to excessive vibration (greater than 0.5 g continuously).
Vibration levels in excess of 0.5 g can affect the meter accuracy.
•Perform a Known Density Verification (KDV) check of the meter prior to installing
the meter in your system.
•Installing the meter in a bypass configuration allows you to remove the meter for
servicing or calibration without affecting the main pipeline.
•Install the meter in a thermo-well pocket to ensure the temperature of the sample
gas is equal to that of the pipeline gas. Micro Motion thermo-well pocket kits are
available for purchase.
•Minimize the length and volume of the input sample pipe to ensure an optimal
meter response time. Use 6 mm (1/4 in) instrument tubing and low-volume inlet
filters.
•Control gas flow with a needle valve mounted before or after the meter, depending
on the installation.
•Install an external coalescing filter in the sample gas inlet pipework to minimize
condensate and dust contamination.
•Verify that the filters in your system are not causing any excessive flow restrictions.
•Verify that the pressure of the process gas is approximately equal to the pipeline
pressure.
•Do not exceed more than a 10% reduction of the cross-sectional area at the point of
insertion in the pipeline to ensure minimal effect on pressure.
•Ensure that the meter and associated pipework are pressure-tested to 1½ times the
maximum operating pressure after installation.
•Install thermal insulation to the meter and the inlet and bypass-loop pipeline to
maintain temperature equilibrium between the sample and pipeline gases. Do not
insulate the transmitter (electronics) and maintain a nominal 1-in clearance
between the insulation and the transmitter housing.
Planning
2Micro Motion® Gas Density Meters

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 (0.35 ft3/hr), the density reading can become slightly
unstable and may introduce a small density error. For natural gas with a typical application
density of approximately 0.06 g/cm3 (60 kg/m3), a pressure differential of approximately
1.66 mbar (0.67 in WC) is required to maintain a flow rate of 5 l/hr (0.176 ft3/hr) .
Pressure drop through the meterFigure 1-1:
Volume of gas in meter = 40 cm3
3.5
3
2.5
2
1.5
1
.5
0
0 2 4 6 8 10
Flowrate (lt/hr)
Recommended
operating
flow rate
Volume of gas in meter = 2.44 in3
1.2
1.0
.8
.6
.4
.2
0
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35
Flowrate (ft3/hr)
Pressure drop (mbar)
Pressure drop (inch WC)
Recommended
operating
flow rate
Planning
Installation Manual 3

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
Minimum wire gauge (AWG per feet)Figure 1-2:
300 600 900 1200 1500 1800 2100 2400 2700 3000
Distance of Installation (ft)
22.8V
24V
14
15
16
17
18
19
20
21
22
23
24
25
26
AWG
Minimum Wire Gauge
Planning
4Micro Motion® Gas Density Meters

Minimum wire area (mm2 per meter)Figure 1-3:
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.350
0.400
0.450
0.500
0.550
0.600
0.650
0.700
0.750
0.800
0.850
0.900
100 200 300 400 500 600 700 800 900 1000
Minimum Wire Area (mm2)
Distance of Installation (m)
Minimum Wire Area (mm2)
22.8V
24V
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. Micro Motion provides thermo-well pocket
installation kits for purchase. Contact your local sales representative or Micro Motion
Customer Support at [email protected] for more information.
A thermo-well pocket installation requires the following, before you can mount and
connect the GDM:
1. Create an aperture in the pipeline to receive the pocket (see Figure 1-4 for the pocket
dimensions).
Important
Micro Motion recommends that you do not exceed more than a 10% reduction of the cross-
sectional area at the point of insertion to ensure minimal effect on pressure. Follow local
practices and guidelines for welding in hazardous areas, if applicable.
2. Install and weld the pocket in place. Be sure to follow local practices and guidelines
for welding in hazardous areas, if applicable.
Planning
Installation Manual 5

Micro Motion thermo-well pocket dimensionsFigure 1-4:
6.00
(152.30)
Ø3.94
(100.00)
1.59
(40.30)
2.83
(72.00)
Dimensions in inches
(mm)
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.
1.6.1 Installation in an orifice plate metering system
The orifice plate metering system is a widely used method for accurate flow measurement
of natural gas. The orifice meter is a differential pressure device in which the orifice plate
causes a pressure drop between the upstream and downstream sides. The flow rate is
determined from the dimensions of the system (as defined by international standards ISO
5167 and AGA 3), and from measurements of differential pressure and fluid density.
Planning
6Micro Motion® Gas Density Meters