Micro Motion T-SERIES Installation Manual

Installation Manual

20002172, Rev BC

Micro Motion™ T-Series Coriolis Flow and
Density Sensors

February 2020

Safety messages

Safety messages are provided throughout this manual to protect personnel and equipment. Read each safety message carefully
before proceeding to the next step.

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

United States 800-522-6277 U.K. 0870 240 1978 Australia 800 158 727

Canada [phone] The Netherlands [phone]

Mexico [phone]

111

Argentina [phone] Germany 0800 182 5347 Pakistan 888 550 2682

Brazil [phone] Italy 8008 77334 China [phone]

Europe and Middle East Asia Pacific

666

France 0800 917 901 India 800 440 1468

Central & Eastern [phone]

111

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

New Zealand 099 128 804

Japan [phone]

2

Installation Manual Contents

20002172 February 2020

Contents

Chapter 1 Before you begin............................................................................................................5

1.1 About this document........................................................................................................................5

1.2 Hazard messages..............................................................................................................................5

1.3 Related documentation....................................................................................................................5

Chapter 2 Planning........................................................................................................................ 7

2.1 Installation checklist.........................................................................................................................7

2.2 Best practices................................................................................................................................... 8

2.3 Temperature limits...........................................................................................................................8

2.4 Recommendations for hygienic and self-draining applications......................................................... 9

Chapter 3 Mounting.....................................................................................................................13

3.1 Mount the sensor........................................................................................................................... 13

3.2 Attach extended electronics...........................................................................................................13

3.3 Rotate junction box or 800 core processor (optional)..................................................................... 15

Chapter 4 Transmitter power and I/O wiring................................................................................ 17

4.1 Options for wiring...........................................................................................................................17

4.2 Connect 4-wire cable......................................................................................................................18

4.3 Connect the 9-wire cable ............................................................................................................... 22

Chapter 5 Grounding....................................................................................................................23

Chapter 6 Supplementary information.........................................................................................25

6.1 Purge the sensor case .................................................................................................................... 25

Installation Manual iii

Contents Installation Manual

February 2020 20002172

iv Micro Motion T-Series

Installation Manual Before you begin

20002172 February 2020

1 Before you begin

1.1 About this document

This document provides information on planning, mounting, wiring, and grounding the T­Series sensor.

The information in this document assumes that users understand basic transmitter and
sensor installation, configuration, and maintenance concepts and procedures.

1.2 Hazard messages

This document uses the following criteria for hazard messages based on ANSI standards
Z535.6-2011 (R2017).

DANGER

Serious injury or death will occur if a hazardous situation is not avoided.

WARNING

Serious injury or death could occur if a hazardous situation is not avoided.

CAUTION

Minor or moderate injury will or could occur if a hazardous situation is not avoided.

NOTICE

Data loss, property damage, hardware damage, or software damage can occur if a
situation is not avoided. There is no credible risk of physical injury.

Physical access

NOTICE

Unauthorized personnel can potentially cause significant damage and/or misconfiguration
of end users' equipment. Protect against all intentional or unintentional unauthorized use.

Physical security is an important part of any security program and fundamental to
protecting your system. Restrict physical access to protect users' assets. This is true for all
systems used within the facility.

1.3 Related documentation

You can find all product documentation on the product documentation DVD shipped with
the product or at www.emerson.com.

See any of the following documents for more information:

• The hazardous area approvals documentation shipped with the sensor or available at

www.emerson.com/flowmeasurement.

• Micro Motion T-Series Flow and Density Meters Product Data Sheet

Installation Manual 5

Before you begin Installation Manual

February 2020 20002172

• Micro Motion 9-Wire Flowmeter Cable Preparation and Installation Guide

• The transmitter installation and configuration and use guides

6 Micro Motion T-Series

Installation Manual

20002172 February 2020

Planning

2 Planning

2.1 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.

WARNING

Failure to abide by approvals can cause an explosion resulting in injury or death.

□ 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.

Table 2-1: Maximum cable lengths

Cable type To transmitter Maximum length

Micro Motion
9-wire

Micro Motion
4-wire

Table 2-2: Maximum lengths for user-supplied 4-wire cable

Wire function Wire size Maximum length

Power (VDC) 22 AWG (0.326 mm²) 300 ft (91 m)

Signal (RS-485) 22 AWG (0.326 mm²) or larger 1,000 ft (305 m)

9739 MVD and 5700
transmitter

All other MVD transmitters 60 ft (18 m)

All 4-wire MVD transmitters 1,000 ft (305 m) without Ex-approval

20 AWG (0.518 mm²) 500 ft (152 m)

18 AWG (0.823 mm²) 1,000 ft (305 m)

1,000 ft (305 m)

500 ft (152 m) with IIC-rated sensors
1,000 ft (305 m) with IIB-rated sensors

□ For optimal performance, install the sensor in the preferred orientation. The sensor will

work in any orientation as long as the flow tubes remain full of process fluid.

□ 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.)

Installation Manual 7

Planning Installation Manual

February 2020 20002172

2.2 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.

2.3 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.

Note

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

below -40 °F (-40.0 °C) or above 140 °F (60.0 °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 areas 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 at

www.emerson.com/flowmeasurement.

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

covering the transmitter, core processor, or junction box, but does not affect
temperature ratings. When insulating the sensor case at elevated process
temperatures above 140 °F (60.0 °C), ensure electronics are not enclosed in insulation
as this may lead to electronics failure.

8 Micro Motion T-Series

122 (50)

D

A

B

C

125.5
(52)

140 (60)

-40 (-40)

-60 (–51)

-20 (-29)

20 (7)

60 (16)

100 (38)

-60 (-51)
300 (149)

-20 (-29)

20 (7)

60 (16)

100 (38)

140 (60)

200 (93)

280 (138)

240 (116)

320 (160)

Installation Manual

Planning

20002172 February 2020

Ambient and process temperature limits for all models

A. Ambient temperature of core processor or transmitter in °F (°C)

B. Maximum process temperature in °F (°C)
C. Mount transmitter remotely and use a junction box
D. Temperature is below -40 °F (-40 °C); mount transmitter remotely and use a junction box

2.4 Recommendations for hygienic and self­draining applications

For optimal cleanability and drainability:

• If possible, install the sensor in a vertical pipeline with the process fluid flowing upward

through the sensor.

• The minimum angle of inclination of the sensor depends on the process fitting. See

Figure 2-1 and Table 2-3.

• For clean-in-place (CIP) applications, Micro Motion recommends using the generally-

accepted flow velocity of at least 1.5 m/s for cleaning the sensor.

• If the process piping must be larger than the sensor, eccentric reducers may be used to

ensure full drainability. In this case, the process end connections for the piping and
sensor must be the same size. See Figure 2-2.

Note

As part of the cleaning process, you can purge skid-based systems with nitrogen at the
end of the cleaning cycle. When using eccentric reducers, it is possible to trap gas in
the section of process piping adjacent to the reducer. Sensor performance can be
impacted by intermittent flow of the captured gas in a liquid fluid stream.

Installation Manual 9

$

%

Planning Installation Manual

February 2020 20002172

• The gap between the electronics housing and sensor body should be inspected

periodically. Manually clean this gap when necessary.

• Tri-Clamp® and DIN 11851 style process connections require special gaskets to comply

with EHEDG requirements for hygienic design.

Figure 2-1: Sensor inclination

A. Angle of inclination

B. Direction of gravity

Table 2-3: Minimum angle of inclination

Model

T025F, T025T 621 0.5 in (13 mm) Tri-Clamp compatible sanitary

T050F, T050T 621 0.5 in (13 mm) Tri-Clamp compatible sanitary

T075F, T075T 622 0.75 in (19.0 mm) Tri-Clamp compatible sanitary

Fitting
code

670 DN10 DIN 11851 sanitary coupling 47°

671 DN15 DIN 11851 sanitary coupling 47°

676 DN15 DIN 11864-1A sanitary coupling 47°

671 DN15 DIN 11851 sanitary coupling 47°

676 DN15 DIN 11864-1A sanitary coupling 47°

623 1 in (25 mm) Tri-Clamp compatible sanitary clamp 47°

662 DN25 ISO 2853 (IDF) sanitary coupling 47°

Description Min. angle

clamp

clamp

clamp

47°

0°

0°

672 DN25 DIN 11851 sanitary coupling 47°

677 DN25 DIN 11864-1A sanitary coupling 47°

692 DN25 SMS 1145 sanitary coupling 32°

T100F, T100T 623 1 in (25 mm) Tri-Clamp compatible sanitary clamp 0°

10 Micro Motion T-Series

B

C

A

Installation Manual Planning

20002172 February 2020

Table 2-3: Minimum angle of inclination (continued)

Model

Fitting
code

Description Min. angle

624 1.5 in (38 mm) Tri-Clamp compatible sanitary

clamp

672 DN25 DIN 11851 sanitary coupling 0°

677 DN25 DIN 11864-1A sanitary coupling 0°

T150F, T150T 624 1.5 in (38 mm) Tri-Clamp compatible sanitary

clamp

625 2 in (51 mm) Tri-Clamp compatible sanitary clamp 46°

663 DN51 ISO 2853 (IDF) sanitary coupling 47°

673 DN40 DIN 11851 sanitary coupling 0°

674 DN50 DIN 11851 sanitary coupling 47°

678 DN50 DIN 11864-1A sanitary coupling 47°

693 DN51 SMS 1145 sanitary coupling 32°

Figure 2-2: Eccentric reducer

46°

0°

A. Eccentric reducer

B. Process end connection is the same size as the sensor connection

C. Sensor case

Installation Manual 11

Planning Installation Manual

February 2020 20002172

12 Micro Motion T-Series

Installation Manual

20002172 February 2020

Mounting

3 Mounting

3.1 Mount the sensor

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

NOTICE

• Lifting the sensor by the electronics or purge connections can damage the device.

• To reduce the risk of collecting liquid in the electronics housing, do not orient

transmitters or sensor junction boxes with their conduit openings pointing upward.

Procedure

Mount the sensor.

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.

3.2 Attach extended electronics

If your installation has a sensor with extended electronics, you will need to install the
extender onto the sensor case.

Extended core processors are matched at the factory to specific sensors. Keep each core
processor together with the sensor with which it was shipped.

Installation Manual 13

G

H

E

D

C

A

B

F

Mounting

Installation Manual

February 2020 20002172

NOTICE

Keep the extender and feedthrough clean and dry. Moisture or debris in the extender or
feedthrough can damage electronics and result in measurement error or flowmeter
failure.

Procedure

1. Remove and recycle the plastic cap from the feedthrough on the sensor.

Figure 3-1: Feedthrough and extender components

A. Transmitter or core processor
B. Extender
C. O-ring

D. Feedthrough

E. Clamping ring

F. Clamping screw
G. Plastic plug
H. Plastic cap

2. Loosen the clamping screw and remove the clamping ring. Leave the O-ring in place
on the feedthrough.

3. Remove and recycle the plastic plug from the extender.

4. Fit the extender onto the feedthrough by carefully aligning the notches on the
bottom of the extender with the notches on the feedthrough.

5. Close the clamping ring and tighten the clamping screw to 13 in lbf (1.47 N m) to
18 in lbf (2.03 N m).

14 Micro Motion T-Series

Installation Manual Mounting

20002172 February 2020

3.3 Rotate junction box or 800 core processor (optional)

An integrally mounted junction box or 800 core processor can be rotated to one of eight
possible positions in 45 degree increments.

Figure 3-2: Parts for rotating the junction box or 800 core processor on the sensor

A

B

D

C

E

A. Housing

B. Clamping ring
C. Clamping ring screw
D. Feedthrough

E. Alignment notches

Note

The 800 core processor is shown in this figure. The junction box has a somewhat different
appearance.

Procedure

1. Loosen the clamping ring screw and remove the clamping ring.

2. Gently separate the housing from the feedthrough, but only until there is sufficient

clearance from the alignment notches to rotate the housing.

3. Rotate the housing to the desired position and in line with the alignment notches.

4. Seat the housing onto the feedthrough.

5. Replace the clamping ring and tighten the clamping ring screw.

Installation Manual 15

Mounting Installation Manual

February 2020 20002172

16 Micro Motion T-Series

Installation Manual Transmitter power and I/O wiring

20002172 February 2020

4 Transmitter power and I/O wiring

4.1 Options for wiring

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

Table 4-1: Wiring procedures by electronics option

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

™

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

Integral core processor with
remote transmitter

Remote core processor
attached to transmitter

Remote core processor
separate from transmitter –

double-hop

WARNING

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

Connect a 9-wire cable between the sensor and the transmitter/
core processor. Refer to Connect the 9-wire cable , as well as the
Micro Motion Micro Motion 9-Wire Flowmeter Cable Preparation
and Installation Guide.

• Connect a 4-wire cable between the core processor and

transmitter. Refer to Connect 4-wire cable.

• Connect a 9-wire cable between the sensor and the core

processor. Refer to Connect the 9-wire cable , as well as the
Micro Motion Micro Motion 9-Wire Flowmeter Cable Preparation

and Installation Guide

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
resulting in injury or death.

NOTICE

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.

Installation Manual 17

Transmitter power and I/O wiring Installation Manual

February 2020 20002172

4.2 Connect 4-wire cable

4.2.1 4-wire cable types and usage

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

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

User-supplied 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, or the host.

Wire gauge Maximum cable length

VDC 22 AWG (0.326 mm²) 300 ft (91 m)

VDC 20 AWG (0.518 mm²) 500 ft (152 m)

VDC 18 AWG (0.823 mm²) 1,000 ft (305 m)

RS-485 22 AWG (0.326 mm²) or larger 1,000 ft (305 m)

4.2.2 Prepare a cable with a metal conduit

Procedure

1. Remove the core processor cover using a flat-blade screw driver.

2. Run the conduit to the sensor.

3. Pull the cable through the conduit.

4. Cut the drain wires and let them float at both ends of the conduit.

4.2.3

Prepare a cable with user-supplied cable glands

Procedure

1. Remove the core processor cover using a flat-blade screw driver.

2. Pass the wires through the gland nut and gland body.

18 Micro Motion T-Series

Installation Manual Transmitter power and I/O wiring

20002172 February 2020

A. Gland body
B. Gland nut

3. Terminate the RS-485 shield and drain wires to the housing internal grounding

screw.

4. Assemble the gland according to vendor instructions.

4.2.4 Prepare a cable with Micro Motion-supplied cable glands

Procedure

1. Remove the core processor cover using a flat-blade screw driver.

2. Pass the wires through the gland nut and clamping insert.

A. Gland nut
B. Clamping insert

3. Strip the cable jacket.

Option

NPT gland type Strip 4.5 in (114 mm)

M20 gland type Strip 4.25 in (108 mm)

4. Remove the clear wrap and filler material.

5. Strip most of the shielding.

Option

NPT gland type Strip all but 0.75 in (19 mm)

M20 gland type Strip all but 0.5 in (13 mm)

Description

Description

Installation Manual 19

Transmitter power and I/O wiring Installation Manual

February 2020 20002172

6. Wrap the drain wires twice around the shield and cut off the excess drain wires.

A. Drain wires wrapped around shield

7. For foil (shielded cable) only:

Note

For braided (armored cable) skip this step and contine to the next step.

Option Description

NPT
gland
type

M20
gland
type

a. Slide the shielded heat shrink over the drain wires. Ensure that the

wires are completely covered.

b. Apply 250 °F (121.1 °C) heat to shrink the tubing. Do not burn the

cable.

c. Position the clamping insert so the interior end is flush with the

braid of the heat shrink.

A. Shielded heat shrink
B. After heat is applied

Trim 0.3 in (8 mm).

A. Trim

8. Assemble the gland by folding the shield or braid back over the clamping insert and

0.125 in (3 mm) past the O-ring.

A. Shield folded back

20 Micro Motion T-Series

A

B

D

C

AA

Installation Manual Transmitter power and I/O wiring

20002172 February 2020

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

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

A. Shield folded back
B. Gland body

4.2.5 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.

Procedure

1. Connect the wires to the core processor terminals.

• If you are connecting to a standard core processor, use the following image and

connections:

A. Terminal 1 (Power supply +): Red wire

B. Terminal 2 (Power supply -): Black wire
C. Terminal 3 (RS-485/A): White wire
D. Terminal 4 (RS-485/B): Green wire

• If you are connecting to an enhanced core processor, use the following image

and connections:

Installation Manual 21

D

A

B

C

Transmitter power and I/O wiring Installation Manual

February 2020 20002172

A. Terminal 1 (Power supply +): Red wire

B. Terminal 2 (Power supply -): Black wire
C. Terminal 3 (RS-485/A): White wire
D. Terminal 4 (RS-485/B): Green wire

2. Reinstall the core processor cover.

3. Torque the cover screws to:

• For aluminum housing: 10 in lbf (1.13 N m) to 13 in lbf (1.47 N m)

• For stainless steel housing: minimum 19 in lbf (2.15 N m)

If properly seated, there will be no gap between cover and base.

4. Connect the wires to the transmitter terminals using the transmitter installation
manual.

4.3 Connect the 9-wire cable

Procedure

1. Prepare and install the cable according to the instructions in the Micro Motion 9-Wire
Flowmeter Cable Preparation and Installation Guide.

2. Insert the stripped ends of the individual wires into the terminal blocks of the
junction box. Ensure that no bare wires remain exposed.

3. Match the wires color for color. For wiring at the transmitter or remote core
processor, refer to the transmitter documentation.

4. Tighten the screws to hold the wires in place.

5. Ensure integrity of gaskets, then tightly close and seal the junction box cover and all
housing covers.

6. Refer to the transmitter installation manual for signal and power wiring
instructions.

22 Micro Motion T-Series

Installation Manual Grounding

20002172 February 2020

5 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

Use the following guides for grounding practices:

• In Europe, IEC 60079-14 is applicable to most installations, in particular sections

16.2.2.3 and 16.2.2.4.

• 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 (2.08 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.

NOTICE

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.

Installation Manual 23

Grounding Installation Manual

February 2020 20002172

24 Micro Motion T-Series

Installation Manual Supplementary information

20002172 February 2020

6 Supplementary information

6.1 Purge the sensor case

Prerequisites

Make sure the following are available before beginning the purge procedure:

• Teflon™ tape

• Argon or nitrogen gas sufficient to purge the sensor case

If the sensor has purge fittings, they should remain sealed at all times. The sensor is
purged of all oxygen and sealed at the factory. If the purge plugs are never removed, it is
not necessary to purge or re-seal the sensor. For more information, contact customer
support.

Whenever a purge plug is removed from the sensor case, you must purge the case again.

Procedure

1. Shut down the process, or set control devices for manual operation.

NOTICE

Before performing the case purging procedure, shut down the process or set the
control devices for manual operation. Performing the purge procedure while the
flowmeter is operating could affect measurement accuracy, resulting in inaccurate
flow signals.

2. Remove both purge plugs from the sensor case. If purge lines are being used, open

the valve in the purge lines.

WARNING

• If a rupture disk has been installed on the purge fitting, stay clear of the

rupture disk pressure relief area. High-pressure fluid escaping from the sensor
can cause severe injury or death. Orient the sensor so that personnel and
equipment will not be exposed to any discharge along the pressure relief path.

• Take all necessary precautions when removing purge plugs. Removing a purge

plug compromises the secondary containment of the sensor and could expose
the user to process fluid.

• Improper pressurization of the sensor case could result in injury.

NOTICE

If a rupture disk has been installed on the purge fitting, use thread protectors when
removing the purge fitting so as not to damage the disk membrane surrounding
the rupture disk.

3. Prepare the purge plugs for reinstallation by wrapping them with 2–3 turns of
Teflon tape.

Installation Manual 25

Supplementary information Installation Manual

February 2020 20002172

4. Connect the supply of nitrogen or argon gas to the inlet purge connection or open
inlet purge line. Leave the outlet connection open.

NOTICE

• Exercise caution to avoid introducing dirt, moisture, rust, or other contaminants

into the sensor case.

• If the purge gas is heavier than air (such as argon), locate the inlet lower than the

outlet, so that the purge gas will displace air from bottom to top.

• If the purge gas is lighter than air (such as nitrogen), locate the inlet higher than

the outlet, so that the purge gas will displace air from top to bottom.

5. Make sure that there is a tight seal between the inlet connection and sensor case, so
that air cannot be drawn by suction into the case or purge line during the purging
process.

6. Run purge gas through the sensor.

The purge time is the amount of time required for full exchange of atmosphere to
inert gas. The larger the line size, the greater amount of time is required to purge
the case. If purge lines are being used, increase the purge time to fill the additional
volume of the purge line.

Important

Keep the purge gas pressure below 7.25 psi (0.5 bar).

Table 6-1: Purge time

Sensor model Purge rate Time, in minutes

T025 20 ft3/h (566.3 l/h) 1

T050 20 ft3/h (566.3 l/h) 1

T075 20 ft3/h (566.3 l/h) 3

T100 20 ft3/h (566.3 l/h) 5

T150 20 ft3/h (566.3 l/h) 10

7. At the appropriate time, shut off the gas supply, then immediately seal the purge
outlet and inlet connections with the purge plugs.

Avoid pressurizing the sensor case. If pressure inside the case elevates above
atmospheric pressure during operation, the flowmeter density calibration will be
inaccurate.

8. Make sure that the purge fitting seals are tight so that air cannot be drawn by
suction into the sensor case.

26 Micro Motion T-Series

Installation Manual

20002172 February 2020

Installation Manual 27

*20002172*

20002172

Rev. BC

2020

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]

©

2020 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]
T [phone]
F [phone]

www.emerson.com/nl-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]