Micro Motion Specific Gravity Meter Installation 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: [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]

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 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

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.

Planning

Process

Confirm you have all parts necessary and meet the basic installa­tion requirements.

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.

Select the control pressure for the meter. See Micro Motion Specific Gravi‐

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.

Reference

See Section 1.2

See Chapter 3

ty Meters (SGM): Configuration
and Use Manual

Installation Manual 1

Planning

Part Quantity

Micro Motion® Specific Gravity Meter (SGM) 1

Labeled enclosure (if applicable), which includes:

- Enclosure mounting feet

- Instructions for attaching the mounting feet

Accessories kit:

- M20 to 1/2-inch NPT adapter (if applicable)

- 1/2-inch NPT blanking plug

- 2.5 mm hex key

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

1

1.3

2 Micro Motion Specific Gravity Meters

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

• 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.

Installation Manual 3

I

G

E

J

B

F

H

A

D

C

M

K

L

O

N

SGM

Planning

Typical wall-mounted installation of the SGM in an enclosureFigure 1-1:

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

4 Micro Motion Specific Gravity Meters

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

Planning

• 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:

A. AWG
B. Distance of installation

Installation Manual 5

Planning

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

A. Minimum wire area (mm2)
B. Distance of installation

6 Micro 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.

Mounting

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

Installation Manual 7

Mounting

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:

8 Micro 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:

Mounting

A. Pressure relief
B. Process gas output
C. Process gas input

Installation Manual 9

B

C

D

A

D

E

Mounting

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:

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.

10 Micro Motion Specific Gravity Meters

Mounting

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.

Installation Manual 11

Wiring

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 single­loop wiring or HART multi-drop wiring.

Transmitter outputsTable 3-1:

Output channels

Transmitter version

Analog 4–20 mA + HART 4–20 mA Modbus/RS-485

Time period signal (TPS) 4–20 mA + HART Time Period Sig-

Fixed 4–20 mA (tem-

Processor for remote-mount Model
2700 FOUNDATION fieldbus

A B C

Modbus/RS-485

nal (TPS)

Time period sig-

perature)

Disabled Disabled Modbus/RS-485

nal (TPS)

Disabled

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

Wiring

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:

4–20 mA /Discrete
Output/Time Period

Parameter Power supply

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)

Internal inductance (Li) 0.0 H 0.0 H 0.0 H

0.0 pF 0.0 pF 0.0011 pF

Signal RS-485

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.

Installation Manual 13

Wiring

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

Hazardous area
current

The meter entity parameters require the selected barrier’s open­circuit voltage to be limited to less than 30 VDC (Vmax = 30 VDC).

The meter entity parameters require the selected barrier’s short­circuit 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

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

[e-mail] 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.

Wiring

Output(s)

4–20 mA MTL7728P+

• 4–20 mA

• Time Period Signal (TPS)

• Discrete

Modbus/RS-485 MTL7761AC

Power MTL7728P+

Barrier

MTL7728P+

Procedure

Wire the barriers to the appropriate output terminal and pins (see Figure 3‐1).

Installation Manual 15

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

Wiring

Intrinsically safe mA/DO/TPS output wiring using safety barriersFigure 3-1:

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.

16 Micro Motion Specific Gravity Meters

Wiring

3.2.3 Wire the intrinsically safe Analog outputs version using galvanic isolators

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 [e-mail] for more information on
ordering an isolator kit for your meter.

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.emerson.com.

The galvanic isolator kit (Analog version) provides isolators for connecting the following
outputs. Use the provided isolators with the designated output.

Note

The RS-485 barrier is not isolated.

Output(s)

4–20 mA + HART MTL5541

4–20 mA MTL5541

Modbus/RS-485 MTL7761AC

Power MTL5523

Isolator

Procedure

Wire the isolators to the appropriate output terminal and pins (see Figure 3‐2).

Installation Manual 17

mA1+
HART

PWR

mA2

Hazardous Area

Non-Hazardous Area

MTL7761AC

RS-485 A

RS-485 B

3

4

1

2

MTL5541

2

1

14

13

12

11

MTL5523

2

1

24 VDC

14

13

12

11

24 VDC

LINK

250 Ω

MTL5541

2

1

14

13

12

11

24 VDC

250 Ω

A
B

A

B

Wiring

Intrinsically safe output wiring using galvanic isolators (mA outputs option)Figure 3-2:

A. HART/Field Communicator device
B. Signal device

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.

18 Micro Motion Specific Gravity Meters

3.2.4 Wire the intrinsically safe Time Period Signal (TPS) or Discrete output version using galvanic isolators

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 [e-mail] for
more information on ordering an isolator kit for your meter.

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.emerson.com.

The galvanic isolator kit (TPS/Discrete version) provides isolators for connecting the
following outputs. Use the provided isolators with the designated output.

Wiring

Note

The RS-485 barrier is not isolated.

Output(s)

4–20 mA + HART MTL5541

• Time Period Signal (TPS)

• Discrete

Modbus/RS-485 MTL7761AC

Power MTL5523

Isolator

MTL5532

Procedure

1. Wire the isolators to the appropriate output terminal and pins (see Figure 3‐3).

Installation Manual 19

mA1+
HART

RS-485

PWR

TPS/DO

SIG

Hazardous Area

Non-Hazardous Area

MTL7761AC

MTL5532

RS-485 A

RS-485 B

5

3

4

1

2

1

11

12

13

14

4

1 kΩ

MTL5541

2

1

14

13

12

11

A

24 VDC

24 VDC

1 kΩ

250 Ω

B

A
B

MTL5523

2

1

14

13

12

11

24 VDC

LINK

Wiring

Hazardous area output wiring using galvanic isolators (TPS and Discrete output options)Figure 3-3:

A. HART/Field Communicator
B. Signal device

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.

20 Micro Motion Specific Gravity Meters

1 2 3 4

OFF
ON

Wiring

2. Set the isolator switch settings for the TPS/DO connection (MTL5532 isolator). You

must set the isolator switches appropriately for Pins 1 through 5 (see Table 3‐4).

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).

MTL5532 switch location (plus ON/OFF switch position)Figure 3-4:

MTL5532 switch settingsTable 3-4:

Switch ON/OFF?

1 ON

2 OFF

3 OFF

4 OFF

3.3 Heater wiring

Use this procedure to wire a 115/230 volt heater.

Prerequisites

• Use THHN wire or equal for connecting lines rated for 90 ºC minimum, and for

connectors rated for 105 ºC.

• Refer to the name plate on the heater for the temperature setting, heater watts, and

supply voltage.

Procedure

1. Open the junction box cover.

Installation Manual 21

Wiring

2. Use the following table and figure to wire the heater.

N or L2 NEUTRAl OR LIVE 2

L1 LIVE 1

PN GROUND

A. N or L2
B. L1
C. Ground
D. Thermostat
E. Black
F. Inside junction box
G. Heater block
H. Red/white stripe
I. White or black
J. Green

22 Micro Motion Specific Gravity Meters

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.

• For IECEx installations, IEC 60079-14 is applicable.

If no external standards are applicable, follow these guidelines to ground the meter:

• Use copper wire, 18 AWG (0.75 mm2) or larger wire size.

• Keep all ground leads as short as possible, less than 1 Ω impedance.

• Connect ground leads directly to earth, or follow plant standards.

Grounding

CAUTION!

Ground the meter to earth, or follow ground network requirements for the facility. Improper
grounding can cause measurement error.

Procedure

Check the joints in the pipeline.

- If the joints in the pipeline are ground-bonded, the sensor is automatically grounded

and no further action is necessary (unless required by local code).

- If the joints in the pipeline are not grounded, connect a ground wire to the grounding

screw located on the sensor electronics.

Installation Manual 23

*MMI-20020984*

MMI-20020984

Rev AC

2018

Micro Motion Inc. USA

Worldwide Headquarters
7070 Winchester Circle
Boulder, Colorado USA 80301
T [phone]
T [phone]
F [phone]

www.emerson.com

Micro Motion Asia

Emerson Automation Solutions
1 Pandan Crescent
Singapore 128461
Republic of Singapore
T [phone]
F [phone]

©

2018 Micro Motion, Inc. All rights reserved.

The Emerson logo is a trademark and service mark of Emerson Electric Co. Micro Motion, ELITE,
ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Automation
Solutions family of companies. All other marks are property of their respective owners.

Micro Motion Europe

Emerson Automation Solutions
Neonstraat 1
6718 WX Ede
The Netherlands
T [phone]
F [phone]

www.micromotion.nl

Micro Motion United Kingdom

Emerson Automation Solutions
Emerson Process Management Limited
Horsfield Way
Bredbury Industrial Estate
Stockport SK6 2SU U.K.
T [phone]
F [phone]

Micro Motion Japan

Emerson Automation Solutions
1-2-5, Higashi Shinagawa
Shinagawa-ku
Tokyo 140-0002 Japan
T [phone]
F [phone]