Emerson Process Management MMI-20020979 User Manual

Installation Manual

MMI-20020979, Rev AB

Micro Motion® Gas Density Meters (GDM)

Fiscal gas density measurement

May 2015

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: [e-mail]

• Asia-Pacific: [e-mail]

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

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

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.

Planning

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

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.

1

Installation Manual 1

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.

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.

2 Micro Motion® Gas Density Meters

1.3 Recommended sample flow rate

Volume of gas in meter = 40 cm

3

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 in

3

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

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:

Planning

Installation Manual 3

300 600 900 1200 1500 1800 2100 2400 2700 3000

Distance of Installation (f t)

22.8V

24V

14

15

16

17

18

19

20

21

22

23

24

25

26

AWG

Minimum Wire Gauge

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

Minimum wire gauge (AWG per feet)Figure 1-2:

4 Micro Motion® Gas Density Meters

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 (mm

2

)

Distance of Installation (m)

Minimum Wire Area (mm2)

22.8V

24V

Planning

Minimum wire area (mm2 per meter)Figure 1-3:

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 [e-mail] 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

Installation Manual 5

dimensions).

Important

Micro Motion recommends that you do not exceed more than a 10% reduction of the cross­sectional 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.

6.00

(152.30)

Ø3.94

(100.00)

1.59

(40.30)

2.83

(72.00)

Dimensions in

inches
(mm)

Planning

Micro Motion thermo-well pocket dimensionsFigure 1-4:

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.

6 Micro Motion® Gas Density Meters

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. Use 12-mm (1/2-in) insertion
tubing for the gas return pipework.

Installation Manual 7

STATUS

SCROLL SELECT

C

A

E

A

B

D

G

F

H

J K

I

GDM

Planning

Meter installation in pressure recovery applicationFigure 1-5:

A. Meter isolation valves
B. Flowmeter
C. Venting valve
D. Flow control needle valve
E. Filter
F. Pipeline diameter
G. Differential pressure transmitter
H. Density point
I. Distance is eight times the pipeline diameter
J. Thermal insulation
K. 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.

With the pressure recovery installation method:

• No bypass of the orifice plate is necessary.

• Density is measured at the downstream tapping of the orifice plate, which reduces

the significance of pressure build-up across the fine-gauge filters.

• Flow is achieved because the pressure after the orifice plate is lower than that

further downstream.

8 Micro Motion® Gas Density Meters