Micro Motion CNG Installation Manual

Micro Motion® CNG050 Sensors

Installation Manual

20002586, Rev BB

January 2016

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 Temperature limits .........................................................................................................................3

Chapter 2 Mounting .........................................................................................................................4

2.1 Mount the sensor ........................................................................................................................... 4

Chapter 3 Wiring ............................................................................................................................. 5

3.1 Options for wiring .......................................................................................................................... 5

3.2 Connect 4-wire cable ......................................................................................................................5

Chapter 4 Grounding ......................................................................................................................10

Installation Manual i

Contents

ii Micro Motion CNG050

1 Planning

Topics covered in this chapter:

• Installation checklist

• Best practices

• Temperature limits

1.1 Installation checklist

Make sure that the hazardous area specified on the approval tag is suitable for the

□

environment in which the meter will be installed.

Verify that the local ambient and process temperatures are within the limits of the

□

meter.

If your sensor has an integral transmitter, no wiring is required between the sensor

□

and transmitter. Follow the wiring instructions in the transmitter installation manual
for signal and power wiring.

If your transmitter has remote-mounted electronics, follow the instructions in this

□

manual for wiring between the sensor and the transmitter, and then follow the
instructions in the transmitter installation manual for power and signal wiring.

Planning

Maximum lengths for Micro Motion cableTable 1-1:

Cable type To transmitter Maximum length

Micro Motion 4-wire All 4-wire MVD transmitters - 1000 ft (300 m) without Ex-

approval

- 500 ft (150 m) with IIC rated

sensors

- 1000 ft (300 m) with IIB rated

sensors

Maximum lengths for user-supplied 4-wire cableTable 1-2:

Wire function Wire size Maximum length

Power (VDC) 22 AWG (0,35 mm2) 300 ft (90 m)

20 AWG (0,5 mm2) 500 ft (150 m)

18 AWG (0,8 mm2) 1000 ft (300 m)

Signal (RS-485) 22 AWG (0,35 mm2) or larger 1000 ft (300 m)

The sensor will work in any orientation as long as the flow tubes remain full of

□

process fluid.

Installation Manual 1

B

A

Planning

The sensor has a pressure relief feature to evacuate the case in the unlikely event of

□

a loss of primary containment:

- The pressure relief feature is located underneath the calibration tag.

- Orient the sensor so that personnel and equipment will not be exposed to

escaping pressurized discharge along the pressure relief path.

Pressure relief featureFigure 1-1:

A. Pressure relief path
B. Calibration tag

CAUTION!

Failure to properly orient the sensor could result in exposure to pressurized
discharge. Orient the sensor in a way that will not expose personnel and equipment
to the pressure relief path.

- If the pressure relief feature is activated by a loss of primary containment, the

calibration tag will release from the case.

Install the meter so that the flow direction arrow on the sensor case matches the

□

actual forward flow of the process. (Flow direction is also software-selectable.)

1.2 Best practices

The following information can help you get the most from your sensor.

• There are no pipe run requirements for Micro Motion sensors. Straight runs of pipe

upstream or downstream are unnecessary.

• If the sensor is installed in a vertical pipeline, liquids and slurries should flow upward

through the sensor. Gases should flow downward.

• Keep the sensor tubes full of process fluid.

• For halting flow through the sensor with a single valve, install the valve downstream

from the sensor.

• Minimize bending and torsional stress on the meter. Do not use the meter to align

misaligned piping.

• The sensor does not require external supports. The flanges will support the sensor in

any orientation.

2 Micro Motion CNG050

1.3 Temperature limits

Sensors can be used in the process and ambient temperature ranges shown in the
temperature limit graphs. For the purposes of selecting electronics options, temperature
limit graphs should be used only as a general guide. If your process conditions are close to
the gray area, consult with your Micro Motion representative.

The environmental limits of the sensor are as follows:

• Process fluid: –40 to +257 °F (–40 to +125 °C)

• Ambient temperature: –40 to +140 °F (–40 to +60 °C)

Notes

• In all cases, the electronics cannot be operated where the ambient temperature is below –40

°F (–40 °C) or above +140 °F (+60 °C). If a sensor is to be used where the ambient temperature
is outside of the range permissible for the electronics, the electronics must be remotely
located where the ambient temperature is within the permissible range, as indicated by the
shaded area of the temperature limit graphs.

• Temperature limits may be further restricted by hazardous area approvals. Refer to the

hazardous area approvals documentation shipped with the sensor or available from the Micro
Motion web site (www.micromotion.com).

• The extended-mount electronics option allows the sensor case to be insulated without

covering the , but does not affect temperature ratings. When insulating the sensor case at
elevated process temperatures (above 140 °F), please ensure electronics are not enclosed in
insulation as this may lead to electronics failure.

Planning

Installation Manual 3

Mounting

2 Mounting

2.1 Mount the sensor

Use your common practices to minimize torque and bending load on process connections.

Tip

To reduce the risk of condensation problems, do not orient transmitters or sensor junction boxes
with their conduit openings pointing upward.

CAUTION!

Do not lift the sensor by the electronics. Lifting the sensor by the electronics can damage the
device.

Mounting the sensorFigure 2-1:

Notes

• Do not use the sensor to support the piping.

• The sensor does not require external supports. The flanges will support the sensor in any

orientation.

4 Micro Motion CNG050

3 Wiring

Topics covered in this chapter:

• Options for wiring

• Connect 4-wire cable

3.1 Options for wiring

The wiring procedure you follow depends on which electronics option you have.

Wiring procedures by electronics optionTable 3-1:

Electronics option Wiring procedure

Integral transmitter The transmitter is already connected to the sensor. No wiring is required

between sensor and transmitter. See the transmitter installation manual for
wiring the power and signal cable to the transmitter.

MVD™Direct Connect

Integral core processor with remote
transmitter

™

There is no transmitter to wire. See the MVD Direct Connect manual for wiring
the power and signal cable between the sensor and the direct host.

The core processor is already connected to the sensor. Connect a 4-wire cable
between the core processor and transmitter. Refer toSection 3.2.

Wiring

CAUTION!

Make sure the hazardous area specified on the sensor approval tag is suitable for the
environment in which the sensor will be installed. Failure to comply with the requirements for
intrinsic safety in a hazardous area could result in an explosion.

CAUTION!

Fully close and tighten all housing covers and conduit openings. Improperly sealed housings
can expose electronics to moisture, which can cause measurement error or flowmeter failure.
Inspect and grease all gaskets and O-rings.

3.2 Connect 4-wire cable

3.2.1 4-wire cable types and usage

Micro Motion offers two types of 4-wire cable: shielded and armored. Both types contain
shield drain wires.

Installation Manual 5

Wiring

The 4-wire cable supplied by Micro Motion consists of one pair of red and black 18 AWG
(0.75 mm2) wires for the VDC connection, and one pair of white and green 22 AWG
(0.35 mm2) wires for the RS-485 connection.

User-supplied 4-wire cable must meet the following requirements:

• Twisted pair construction.

• Applicable hazardous area requirements, if the core processor is installed in a

hazardous area.

• Wire gauge appropriate for the cable length between the core processor and the

transmitter.

Wire gaugeTable 3-2:

Wire gauge Maximum cable length

VDC 22 AWG (0.35 mm2) 300 ft (90 m)

VDC 20 AWG (0.5 mm2) 500 ft (150 m)

VDC 18 AWG (0.8 mm2) 1000 ft (300 m)

RS-485 22 AWG (0.35 mm2) or larger 1000 ft (300 m)

3.2.2 Prepare the 4-wire cable

Important

For user-supplied cable glands, the gland must be capable of terminating the drain wires.

Note

If you are installing unshielded cable in continuous metallic conduit with 360º termination shielding,
you only need to prepare the cable – you do not need to perform the shielding procedure.

6 Micro Motion CNG050

Wiring

4-wire cable preparationFigure 3-1:

Remove the core processor

cover

Cable glands

Micro Motion

cable gland

Pass the wires through the gland nut and clamping insert.

Gland nut

1. Strip 4-1/2 inch (115 mm) of cable jacket.

2. Remove the clear wrap and filler material.

3. Strip all but 3/4 inch (19 mm) of shielding.

Clamping
insert

NPT

Wrap the drain wires twice around the shield and cut off

Gland supplier

Gland type

the excess drain wires.

Cable layout

through the gland.

Terminate the drain

wires inside the

M20

1. Strip 4-1/4 inch (108 mm) of cable jacket.

2. Remove the clear wrap and filler material.

3. Strip all but 1/2 inch (12 mm) of shielding.

User-supplied

cable gland

Pass the wires

gland.

Metal conduit

Run conduit to

sensor

Lay cable in conduit

Done

(do not perform the

shielding procedure)

Drain wires
wrapped around
shield

Go to the shielding

procedure

Installation Manual 7

Wiring

4-wire cable shieldingFigure 3-2:

From the preparation

procedure

Micro Motion

cable gland

Braided

(armored cable)

Apply the Heat Shrink

1. Slide the shielded heat shrink over the drain wires. Ensure that the
wires are completely covered.

2. Apply heat (250 °F or 120 °C) to shrink the tubing. Do not burn the
cable.

3. Position the clamping insert so the interior end is flush with the braid
of the heat shrink.

Assemble the Gland

1. Fold the shield or braid back over the clamping insert and 1/8 inch
(3 mm) past the O-ring.

2. Install the gland body into the conduit opening on the core processor housing.

3. Insert the wires through gland body and tighten the gland nut onto the gland body.

Cable shield

type

Shielded heat
shrink

Foil

(shielded cable)

NPT

Gland supplier

Gland type M20

After heat applied

User-supplied

cable gland

Trim 7 mm from the shielded

heat shrink

Trim

Terminate the shield

and drain wires in the

Assemble the gland

according to vendor

gland

instructions

Shield folded back

Done

Gland body

3.2.3 Connect the wires to the core processor terminals

After the 4-wire cable has been prepared and shielded (if required), connect the individual
wires of the 4-wire cable to the terminals on the core processor.

8 Micro Motion CNG050

Wiring

Core processor terminalsFigure 3-3:

From Step 1 or 2

Connect the wires to the core processor terminals:
Red wire > Terminal 1 (Power supply +)
Black wire > Terminal 2 (Power supply –)
White wire > Terminal 3 (RS-485/A)
Green wire > Terminal 4 (RS-485/B)

Reinstall and tighten the core processor cover

Connect the wires to the transmitter

(see the transmitter manual)

terminals

Installation Manual 9

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, IEC 79-14 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.

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

• Use copper wire, 14 AWG (2,0 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.

CAUTION!

Ground the flowmeter 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.

Tip

The sensor electronics may be a transmitter, core processor, or junction box. The grounding
screw may be internal or external.

10 Micro Motion CNG050

Grounding

Installation Manual 11

Micro Motion Inc. USA

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

www.micromotion.com

Micro Motion Europe

Emerson Process Management
Neonstraat 1
6718 WX Ede
The Netherlands
T [phone]
F [phone]

www.micromotion.nl

*20002586*

20002586

Rev BB

2016

Micro Motion Asia

Emerson Process Management
1 Pandan Crescent
Singapore 128461
Republic of Singapore
T [phone]
F [phone]

Micro Motion United Kingdom

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

Micro Motion Japan

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

©

2016 Micro Motion, Inc. All rights reserved.

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Connect marks are marks of one of the Emerson Process
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