Emerson Micro Motion User manual

Installation Manual
MMI-20020984, Rev AC
March 2018
Micro Motion® Specific Gravity Meters (SGM)
Gas specific gravity 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 EU declaration of conformity for directives that apply to this product. The EU declaration of
conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available on
the internet at www.emerson.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.emerson.com.
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 configuration
manual. Product data sheets and manuals are available from the Micro Motion web site at www.emerson.com.
Return policy
Follow Micro Motion procedures when returning equipment. These procedures ensure legal compliance with government
transportation agencies and help provide a safe working environment for 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.
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]
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 and commissioning overview ....................................................................................... 1
1.2 Installation checklist .......................................................................................................................1
1.3 Best practices ................................................................................................................................. 2
1.4 Recommended installation for specific gravity applications ........................................................... 3
1.5 Power requirements .......................................................................................................................4
Chapter 2 Mounting .........................................................................................................................7
2.1 Mount the meter enclosure to a wall .............................................................................................. 7
2.2 Connect the gas bypass lines ..........................................................................................................9
2.3 Rotate the display on the transmitter (optional) ...........................................................................10
Chapter 3 Wiring ........................................................................................................................... 12
3.1 Terminals and wiring requirements .............................................................................................. 12
3.2 Intrinsically safe output wiring ......................................................................................................13
3.3 Heater wiring ............................................................................................................................... 21
Chapter 4 Grounding ......................................................................................................................23
Contents
Installation Manual i

Contents
ii Micro Motion Specific Gravity Meters

1 Planning
Topics covered in this chapter:
•Installation and commissioning overview
•Installation checklist
•Best practices
•Recommended installation for specific gravity applications
•Power requirements
1.1 Installation and commissioning overview
Following is an overview of the tasks to install and commission the Specific Gravity Meter
(SGM). These tasks must be completed before configuring and using the meter.
As part of the SGM commissioning process, you are required to perform an onsite
calibration of the meter. Onsite meter calibration requires calibration gases and additional
hardware to calibrate the meter. See the configuration and use manual for more
information on planning the SGM commissioning. The configuration and use manual
provides guidance on selecting the calibration gases, as well as instruction on performing
an onsite calibration.
Process Reference
Confirm you have all parts necessary and meet the basic installa-
tion requirements.
See Section 1.2
Consider the installation best practices for the meter. See Section 1.3
Mount the meter. See Section 2.1
Connect the gas bypass lines to the meter. See Section 2.2
Wire the meter according to the recommended practices for
your process environment and required approvals.
See Chapter 3
Select the control pressure for the meter. See Micro Motion Specific Gravi‐
ty Meters (SGM): Configuration
and Use Manual
Purge cycle the meter.
Calibrate the meter.
1.2 Installation checklist
□Verify the contents of the product shipment to confirm that you have all parts and
information necessary for the installation.
Planning
Installation Manual 1

Part Quantity
Micro Motion® Specific Gravity Meter (SGM) 1
Labeled enclosure (if applicable), which includes:
-Enclosure mounting feet
-Instructions for attaching the mounting feet
1
Accessories kit:
-M20 to 1/2-inch NPT adapter (if applicable)
-1/2-inch NPT blanking plug
-2.5 mm hex key
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.
□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 SGM.
1.3 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.
•Do not operate the meter above its rated pressure or process temperature.
Planning
2Micro Motion Specific Gravity Meters

•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.
•Installing the meter in a weather-proof enclosure thermally insulates the meter to
maintain temperature equilibrium between the sample and pipeline gases.
•Ensure good ventilation around the meter and/or enclosure to prevent gas build-up
in the unlikely event of a leak.
•Ensure meter is not transported when it contains hazardous substances, including
fluids that may have leaked into and are still contained within the case.
1.4 Recommended installation for specific gravity
applications
To ensure optimum performance of the meter, Micro Motion recommends that you install
the meter inside an enclosure that is mounted to a wall. The following diagram illustrates
the recommended installation of the SGM.
Planning
Installation Manual 3

Typical wall-mounted installation of the SGM in an enclosureFigure 1-1:
I
G
E
JB
F
H
A
D
C
M
K
L
O
N
SGM
A. Input valve
B. Calibration valve
C. Exit valve
D. Isolation valve
E. Purging valve
F. Pipeline
G. Coalescing filter
H. Pressure regulator
I. Flowmeter
J. Calibration gas inputs
K. Pressure relief connection
L. Gas outlet connection
M. Gas inlet connection
N. Vent
O. Electrical cable conduit
P. Wall‐mounted enclosure with SGM
Note
•To ensure that you do not operate the meter above its rated pressure, you must install a pressure regulator between the
gas line and the meter.
•For ATEX installations, you are required to install a coalescing filter and element (as supplied).
1.5 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
Planning
4Micro Motion Specific Gravity Meters

•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:
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 3 00 0
22 . 8 V
24 V
14
15
16
17
18
19
20
21
2 2
23
24
25
26
A
B
A. AWG
B. Distance of installation
Planning
Installation Manual 5

Minimum wire area (mm2 per meter)Figure 1-3:
A. Minimum wire area (mm2)
B. Distance of installation
Planning
6Micro Motion Specific Gravity Meters

2 Mounting
Topics covered in this chapter:
•Mount the meter enclosure to a wall
•Connect the gas bypass lines
•Rotate the display on the transmitter (optional)
2.1 Mount the meter enclosure to a wall
Micro Motion recommends that you install the meter in an enclosure that is mounted to a
wall.
When you order the meter with an enclosure, the meter and pipework inside the enclosure
are configured at the factory to allow for easy installation of the meter in your process
pipeline.
Important
If you are installing the SGM as a stand-alone device (not inside an enclosure): for best performance,
you must ensure that the SGM is not exposed to rapid changes in temperature.
SGM installed in mounting enclosureFigure 2-1:
A. Stainless steel insulated enclosure (600 x 800 x 300 mm)
B. Stainless steel insulated enclosure (600 x 800 x 300 mm) with sample conditioning system
Mounting
Installation Manual 7

Procedure
1. Attach the mounting brackets to the exterior of the meter enclosure. All necessary
parts and instructions for attaching the feet are shipped with the product.
2. Prepare the mounting location on the wall. See
Mounting dimensions for small enclosure and Section 2.1.1 for the mounting
dimensions of the small and large enclosures.
3. Attach the meter enclosure to the wall-mount location.
CAUTION!
When lifting or transporting the meter inside the enclosure, be sure not to drop the
meter. While the meter enclosure is designed to minimize damage due to shocks,
dropping the meter will damage the meter.
2.1.1 Mounting dimensions for a large enclosure
Mounting dimensions for large enclosureFigure 2-2:
Mounting
8Micro Motion Specific Gravity Meters

2.2 Connect the gas bypass lines
Once you have mounted the meter, you are ready to connect the gas bypass lines. There
are three lines: sample gas input, sample gas output, and pressure relief.
Each connector is a 1/4-inch Swagelok bulkhead fitting. These connectors are located on
the outside of the enclosure.
Procedure
Connect the lines to the appropriate connector.
CAUTION!
Be sure to connect the gas input line to the appropriate fitting. Connecting the gas input line to
the wrong fitting could cause damage to the meter.
Gas bypass connectors (located on the side of the enclosure)Figure 2-3:
A. Pressure relief
B. Process gas output
C. Process gas input
Mounting
Installation Manual 9

2.3 Rotate the display on the transmitter
(optional)
The display on the transmitter electronics module can be rotated 90° or 180° from the
original position.
Display componentsFigure 2-4:
B
C
D
A
D
E
A. Transmitter housing
B. Sub‐bezel
C. Display module
D. Display screws
E. 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. Carefully pull the display module out of the main enclosure until the sub-bezel pin
terminals are disengaged from the display module.
Note
If the display pins come out of the board stack with the display module, remove the pins and
reinstall them.
5. Rotate the display module to the desired position.
6. Insert the sub-bezel pin terminals into the display module pin holes to secure the
display in its new position.
Mounting
10 Micro Motion Specific Gravity Meters

7. If you have removed the display screws, line them up with the matching holes on the
sub-bezel, then reinsert and tighten them.
8. Place the display cover onto the main enclosure.
9. Turn the display cover clockwise until it is snug.
10. If appropriate, power up the meter.
Mounting
Installation Manual 11

3 Wiring
Topics covered in this chapter:
•Terminals and wiring requirements
•Intrinsically safe output wiring
•Heater wiring
3.1 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.
For meters connecting to a remote-mount Model 2700 FOUNDATION™ fieldbus
transmitter, you must wire the meter to the remote-mount Model 2700 transmitter using
a 4-wire cable connection. See the processor wiring content in this manual for information
on how to wire the meter.
The screw connectors for each output terminal accept a maximum wire size of 14 AWG
(2.5 mm2).
Important
•Output wiring requirements depend on the hazardous area classification of the environment
in which the meter is installed. It is your responsibility to verify that this installation meets all
corporate, local, and national safety requirements and electrical codes.
•If you will configure the meter to poll an external temperature or pressure device, you must
wire the mA output to support HART communications. You may use either HART/mA single-
loop wiring or HART multi-drop wiring.
Transmitter outputsTable 3-1:
Transmitter version
Output channels
A B C
Analog 4–20 mA + HART 4–20 mA Modbus/RS-485
Time period signal (TPS) 4–20 mA + HART Time Period Sig-
nal (TPS)
Modbus/RS-485
Fixed 4–20 mA (tem-
perature)
Time period sig-
nal (TPS)
Disabled
Processor for remote-mount Model
2700 FOUNDATION fieldbus
Disabled Disabled Modbus/RS-485
Wiring
12 Micro Motion Specific Gravity Meters

3.2 Intrinsically safe output wiring
Micro Motion provides safety barrier and galvanic isolator installation kits for wiring the
meter in a hazardous environment. These kits provide the appropriate barriers or isolators
depending on the outputs available and approvals required.
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.
•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.
3.2.1 Hazardous area entity parameters
DANGER!
•Hazardous voltage can cause severe injury or death. To reduce the risk of hazardous
voltage, shut off power before wiring the meter.
•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.
Input entity parameters
Input entity parameters: all connectionsTable 3-2:
Parameter Power supply
4–20 mA /Discrete
Output/Time Period
Signal RS-485
Voltage (Ui) 30 VDC 30 VDC 18 VDC
Current (Ii) 484 mA 484 mA 484 mA
Power (Pi) 2.05 W 2.05 W 2.05 W
Internal capacitance
(Ci)
0.0 pF 0.0 pF 0.0011 pF
Internal inductance (Li) 0.0 H 0.0 H 0.0 H
RS-485 output and cable parameters
All connections to the meter receive their power from the connected intrinsically safe
barrier. All cable parameters are derived from the output parameters of these devices. The
RS-485 connection also receives power from the connected barrier (MTL7761AC),
although this connection has specific output and cable parameters.
Wiring
Installation Manual 13

RS-485 output and cable entity parameters (MTL7761AC)Table 3-3:
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)19.8 Ω
Cable parameters for Group IIC
External capacitance (Co) 85 nF
External inductance (Lo) 154 µH
External inductance/resistance ratio (Lo/Ro) 31.1 µH/Ω
Cable parameters for Group IIB
External capacitance (Co) 660 nF
External inductance (Lo) 610 µH
External inductance/resistance ratio (Lo/Ro) 124.4 µH/Ω
Hazardous area
voltage
The meter entity parameters require the selected barrier’s open-
circuit voltage to be limited to less than 30 VDC (Vmax = 30 VDC).
Hazardous area
current
The meter entity parameters require the selected barrier’s short-
circuit currents to sum to less than 484 mA (Imax = 484 mA) for all
outputs.
Hazardous area
capacitance
The capacitance (Ci) of the meter is 0.0011 μF. This value added to
the wire capacitance (Ccable) must be lower than the maximum
allowable capacitance (Ca) specified by the safety barrier. Use the
following equation to calculate the maximum length of the cable
between the meter and the barrier: Ci + Ccable ≤ Ca
Hazardous area
inductance
The inductance (Li) of the meter is 0.0 μH. This value plus the field
wiring inductance (Lcable), must be lower than the maximum
allowable inductance (La) specified by the safety barrier. The
following equation can then be used to calculate the maximum cable
length between the meter and the barrier: Li + Lcable ≤ La
Wiring
14 Micro Motion Specific Gravity Meters

3.2.2 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
[email protected] 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.
•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.
The safety barrier kit provides barriers for connecting all of the available meter outputs.
Use the provided barriers with the designated output.
Output(s) Barrier
4–20 mA MTL7728P+
•4–20 mA
•Time Period Signal (TPS)
•Discrete
MTL7728P+
Modbus/RS-485 MTL7761AC
Power MTL7728P+
Procedure
Wire the barriers to the appropriate output terminal and pins (see Figure 3‐1).
Wiring
Installation Manual 15

Intrinsically safe mA/DO/TPS output wiring using safety barriersFigure 3-1:
Bus
Bar
Hazardous Area Non-Hazardous Area
MTL7761AC
RS-485 A
RS-485 B
3
4
1
2
24 VDC
24 VDC
MTL7728P+
24 VDC
3
4
1
2
MTL7728P+
3
4
1
2
250 Ω
MTL7728P+
3
4
1
2
A
B
C
mA1+
HART
RS-485
PWR
mA2/
TPS/DO
A
B
A. HART/Field Communicator device
B. Signal device
C. The recommended resistance will vary depending on your Channel B output. For mA outputs, 250 Ω is the recommended
resistance. For TPS or Discrete outputs, 500–1000 Ω is the recommended resistance.
CAUTION!
•In an electrically noisy environment, screen the cable in a safe area.
•To meet the EC Directive for Electromagnetic Compatibility (EMC), use a suitable instrumentation cable to connect
the meter. The instrumentation cable should have individual screens, foil or braid over each twisted pair, and an
overall screen to cover all cores. Where permissible, connect the overall screen to earth at both ends (360° bonded at
both ends). Connect the inner individual screens at only the controller end.
•For safety, do not terminate the inner individual screens to earth in a hazardous area.
•Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal blanking
plugs.
Wiring
16 Micro Motion Specific Gravity Meters