Emerson Micro Motion Fork Viscosity Meters User Manual

Micro Motion® Fork Viscosity Meters

Direct insertion viscosity meter installation

Installation Manual

MMI-20020994, Rev AA

December 2013

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.

Micro Motion 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

Saudia 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 Power requirements ........................................................................................................................2

1.4 Other installation considerations .................................................................................................... 4

1.5 Recommended installations for short-stem meters .........................................................................7

1.6 Perform a meter check (pre-installation) .........................................................................................9

Chapter 2 Mounting ........................................................................................................................11

2.1 Mount in free-stream application (flanged fitting) .........................................................................11

2.2 Mount in free-stream application (weldolet fitting) .......................................................................12

2.3 Mount with a T-piece (flanged fitting) ........................................................................................... 13

2.4 Mount with a flow-through chamber .............................................................................................15

2.5 Mount in an open tank (long-stem meter) .....................................................................................16

2.6 Mount in a closed tank (long-stem meter) .....................................................................................19

2.7 Attach the PFA ring and circlip .......................................................................................................24

2.8 Rotate the electronics on the meter (optional) ..............................................................................25

2.9 Rotate the display on the transmitter (optional) ............................................................................26

Chapter 3 Wiring ............................................................................................................................ 29

3.1 Available output terminals and wiring requirements ..................................................................... 29

3.2 Explosion-proof/flameproof or non-hazardous output wiring ........................................................30

3.3 Processor wiring for remote-mount 2700 FOUNDATION fieldbus™ option .................................... 34

3.4 Wiring to external devices (HART multidrop) ................................................................................ 39

3.5 Wiring to signal converters and/or flow computers .......................................................................41

Chapter 4 Grounding ...................................................................................................................... 43

Installation Manual i

Contents

ii Micro Motion Fork Viscosity Meter

1 Planning

Topics covered in this chapter:

• Installation checklist

• Best practices

• Power requirements

• Other installation considerations

• Recommended installations for short-stem meters

• Perform a meter check (pre-installation)

1.1 Installation checklist

Verify the contents of the product shipment to confirm you have all parts and

□

information necessary for the installation.

Verify the meter calibration range and boundary corresponds to the planned

□

installation. A calibration mismatch can cause measurement error, and will need to
be corrected.

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.

Make sure that you will have adequate access to the meter for verification and

□

maintenance.

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.

If your meter will be wired to a remote-mount 2700 FOUNDATION fieldbus

□

transmitter:

- Refer to the instructions in this manual for preparing the 4-wire cable and wiring

to the processor connections.

- Refer to the instructions in the transmitter installation manual for mounting and

wiring the 2700 FOUNDATION fieldbus™ transmitter. See Micro Motion
Model 1700 and Model 2700 Transmitters: Installation Manual.

- Consider the maximum cable length between the meter and transmitter. The

maximum recommended distance between the two devices is 1000 ft (300 m).
Micro Motion recommends using Micro Motion cable.

Planning

™

Installation Manual 1

Planning

1.2 Best practices

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

• Handle the meter with care. Follow local practices for lifting or moving the meter.

• Perform a Known Density Verification (KDV) check of the meter prior to installing

the meter in your system.

• For the PFA-coated tines, always fit the protective cover over the tines when the

meter is not in use. The tine coating is not resistant to impact damage.

• Always store and transport the meter in its original packaging. For the long-stem

meters, be sure to include the transit cover secured by the grub screws.

• Do not use liquids incompatible with the materials of construction.

• 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.

• For optimal performance of the meter, ensure the operating conditions correspond

to the meter calibration range and boundary.

• Ensure all piping connections conform to the local and national regulations and

codes of practice.

• Ensure the transmitter housing cover is tightened properly after wiring to maintain

ingress protection and hazardous area approvals.

• Ensure the meter and associated pipework are pressure tested to 1½ times the

maximum operating pressure after installation.

• Thermally insulate the meter and the inlet and bypass-loop pipeline to maintain

stable temperatures.

1.3 Power requirements

Following are the DC power requirements to operate the meter:

• 24 VDC, 0.65 W typical, 1.1 W maximum

• Minimum recommended voltage: 21.6 VDC with 1000 ft of 24 AWG (300 m of

0.20 mm2) power-supply cable

• At startup, power source must provide a minimum of 0.5 A of short-term current at

a minimum of 19.6 V at the power input terminals.

2 Micro Motion Fork Viscosity Meter

Power cable recommendations for explosion-proof/flameproof meters

300 600 900 1200 1500 1800 2100 2400 2700 3000

Distance of Installation (f t)

21.6V

24V

14

15

16

17

18

19

20

21

22

23

24

25

26

AWG Maximum

Minimum Wire Gauge

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

0.400

100 200 300 400 500 600 700 800 900 100 0

Minimum Wire Area (mm

2

)

Distance of Installation (m)

Minimum Wire Area (mm2)

21.6V

24V

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

Planning

Minimum wire area (mm2 per meter)Figure 1-2:

Installation Manual 3

Planning

1.4 Other installation considerations

A variety of external factors exist that affect the ability of the meter to operate
successfully. To ensure that your system works correctly, consider the effects of these
factors when designing your installation.

1.4.1 Calibration boundaries

Important

Micro Motion calibrates all meters at the factory according to the sensor calibration range selected at
point of purchase. The factory calibration process takes into account the potential boundary effect of
the planned installation. At point of installation, confirm that the meter calibration range and
boundary matches the planned installation to ensure optimum performance of the meter. If the
meter calibration does not match the planned installation, measurement error may occur and you
will need to perform an onsite calibration.

The boundary effect of an installation refers to the sensitive, or effective, region of the
meter sensing device being interrupted by the boundary of the pipe walls. This effect can
vary based on the type of installation or the size of the pipeline diameter. Considering this
effect when calibrating the meter is important because the direct insertion meter can only
measure the properties of the fluid that are within the region that the meter is sensitive.

The vibration of the fork meter tines creates an effective measurement region that is
shaped as an ovoid centered on the tips of the tines. The long axis of the ovoid is aligned
with the direction that the tines are vibrating. The meter sensor is insensitive to any fluid
properties outside of this region, and progressively more sensitive to the fluid properties
the closer the fluid is to the meter tines (see Figure 1-3).

4 Micro Motion Fork Viscosity Meter

B

A

C

STATUS

SCROLL SELECT

Planning

Region of measurement boundary or sensitivityFigure 1-3:

A. Long axis
B. Short axis
C. Sensitive, or effective, region

When installing the meter, if part of this effective region or volume is interfered with
because of the pipework or fittings a boundary effect exists (see Figure 1-4).

Installation Manual 5

A

STATUS

SCROLL SELECT

Planning

Example of pipeline installation (with boundary effect)Figure 1-4:

A. Pipe walls interrupt effective region of meter sensitivity

1.4.2 Flow rate considerations

You must maintain flow rates and velocities to be relatively constant within the limits
specified for the meter. The fluid flow provides a steady heat flow into the meter
installation, and the flow rate influences the self-cleaning of the meter tines and the
dissipation of bubbles and solid contaminants around the meter.

If you install the meter in a bypass configuration (such as in a free-stream installation in a 4­inch diameter horizontal bypass, or a flow-through chamber): you can maintain flow by
using a pressure drop, pitot scoop, or a sample pump. When using a sample pump, place
the pump upstream from the meter.

1.4.3 Entrained gas considerations

Entrained gas, or gas pockets, can disrupt the measurement of a fluid. A brief disruption in
the signal caused by transient gas pockets can be corrected in the meter configuration,
but you must avoid more frequent disruptions or serious gas entrainment to ensure
accurate and reliable fluid measurement.

To minimize the possibility of entrained gas:

• Keep pipe lines full of fluid at all times.

• Vent any gas prior to the meter installation location.

• Avoid sudden pressure drops or temperature changes which may cause dissolved

gases to break out of the fluid.

6 Micro Motion Fork Viscosity Meter

• Maintain a back pressure on the system sufficient to prevent gas break out.

• Maintain flow velocity at the sensor within the specified limits.

1.4.4 Solids measurement considerations

Consider the following to avoid issues related to solids contamination:

• Avoid sudden changes of the fluid velocity that may cause sedimentation.

• Install the meter far enough downstream from any pipework configuration that may

cause centrifuging of solids (such as at a pipe bend).

• Maintain flow velocity at the meter installation that is within the specified limits.

• Use filtration in your process, if necessary.

1.4.5 Thermal effects considerations

For high viscosity fluids, you should minimize any temperature gradients in the fluid, and
in the piping and fittings immediately upstream and downstream of the meter. Minimizing
temperature gradients reduces the effect of viscosity changes. We recommend the
following to reduce the thermal effects to your meter installation:

• Always insulate the meter and surrounding pipework thoroughly.

- Insulation must be at least 1 inch (25 mm) of rockwool, preferably 2 inches (50

mm), or use an equivalent insulating heat jacket.

- Insulation must be enclosed in a sealed protective casing to prevent moisture

ingress, air circulation, and crushing of the insulation.

- For flow-through chamber installations, Micro Motion provides a special

insulation jacket because of the opportunity for low volumetric flow rates
(hence, low heat flow) and increased vulnerability to temperature effects.

• Avoid direct heating or cooling of the meter and associated pipe work upstream and

downstream that is likely to create temperature gradients.

• If it is necessary to provide protection against cooling because of loss of flow, you

can apply electrical trace heating. This type of heating must be thermostatically
controlled, and the thermostat must be set to operate below the minimum
operating temperature of the system.

Planning

1.5 Recommended installations for short-stem meters

Micro Motion recommends three standard installations for the short-stem meter to
alleviate any need for onsite calibration. All meters are factory calibrated for these types of
installations and take into consideration the potential boundary effect of each installation.

Table 1-1 highlights these different installations according to specific conditions or

requirements that may exist for your process environment.

Installation Manual 7

Planning

Standard installation types: short-stem metersTable 1-1:

Installation type: Free stream T-Piece

Meter placement Meter tines are

inserted directly into
the main fluid flow.
The meter must always
be installed
horizontally and with
the tines oriented to
allow flow through or
between the gap of
the tines.

Flow rate 0.3 to 0.5 m/s (at the

meter)

Viscosity Up to 500 cP Up to 100 cP (250 cP in

Temperature –50 °C to 200 °C (–58

°F to 392 °F)

Main flow pipe size • Horizontal pipe:

minimum
diameter, 100 mm
(4 inch)

• Vertical pipe:

minimum
diameter, 150 mm
(6 inch)

Advantages • Simple installation

in large bore pipes

• Ideal for clean

fluids and non­waxing oils

• Suitable for line

viscosity
measurement and
simple referrals

Meter tines are
contained in a side
pocket off the main
flow. The meter must
always be installed
horizontally and with
the tines oriented to
allow flow through or
between the gap of
the tines.

0.5 to 3 m/s (at main
pipe wall)

some cases)

–50 °C to 200 °C (–58
°F to 392 °F)

Minimum diameter,
100 mm (4 inch)

• Simple installation

in large bore pipes

• Ideal for clean

fluids and non­waxing oils

• Suitable for line

viscosity
measurement and
simple referrals

Flow-through
chamber

Meter tines are
contained in a flow­through chamber in
which fluid is
circulated from the
main flow.

10 to 30 l/min

Up to 500 cP

–50 °C to 200 °C (–58
°F to 392 °F)

Suitable for all sizes, if
mounted in a bypass
(slipstream)
configuration

• Adaptable

installation to any
diameter main
pipe and for tank
applications

• Ideal for flow and

temperature
conditioning

• Suitable for

complex referrals
and for use with
heat exchangers

• Suitable for step

changes in
viscosity

• Fast response

• Ideal for analyzer

cubicles

8 Micro Motion Fork Viscosity Meter

Standard installation types: short-stem meters (continued)Table 1-1:

Installation type: Free stream T-Piece

Recommendations Do not use with:

• Dirty fluids

• Low or unstable

flow rates

• Where step

changes in
viscosity can occur

• For small bore

pipes

Do not use with:

• Dirty fluids

• Low or unstable

flow rates

• Where step

changes in
viscosity can occur

• For small bore

pipes

• Where

temperature
effects are
significant

Planning

Flow-through
chamber

• Do not use with

uncontrolled flow
rates.

• Careful system

design is required
to ensure
representative
measurement.

• Frequently requires

the use of a pump.

1.6 Perform a meter check (pre-installation)

Micro Motion® recommends that you perform a check of the meter prior to installation.
This check confirms that no damage occurred to the meter during shipment.

1. Remove the meter from the box.

CAUTION!

Handle the meter with care. Follow local practices for lifting or moving the meter.

2. Visually inspect the meter for any physical damage.

If you notice any physical damage to the meter, immediately contact Micro Motion
Customer Support at [e-mail].

3. Connect and power up the meter.

You must remove the back transmitter housing cover to access the PWR terminals.

Installation Manual 9

A

Planning

Power supply wiring terminalsFigure 1-5:

A. 24 VDC

4. Perform a Known Density Verification (KDV) check.

The Known Density Verification procedure is used to verify that the meter's current
operation matches the factory calibration. If the meter passes the test, then it has
not drifted or changed since its factory calibration.

For more information on performing a KDV check, see the configuration and use
manual that shipped with the product.

10 Micro Motion Fork Viscosity Meter

2 Mounting

Topics covered in this chapter:

• Mount in free-stream application (flanged fitting)

• Mount in free-stream application (weldolet fitting)

• Mount with a T-piece (flanged fitting)

• Mount with a flow-through chamber

• Mount in an open tank (long-stem meter)

• Mount in a closed tank (long-stem meter)

• Attach the PFA ring and circlip

• Rotate the electronics on the meter (optional)

• Rotate the display on the transmitter (optional)

Mounting

2.1 Mount in free-stream application (flanged
fitting)

Prerequisites

Free-stream (flanged) installations are recommended for processes with the following
conditions:

Flow 0.3 to 0.5 m/s (at the meter)

Viscosity 0.5 to 12,500 cP

Temperature -50 °C to 200 °C (–58 °F to 392 °F)

-40 °C to 200 °C (-40 °F to 392 °F) in hazardous
areas

Procedure

See Figure 2-1 for information on installing the meter (with a flanged fitting) in a free­stream application.

Important

You must always install the meter horizontally and oriented to allow flow in the gap between the
tines, irrespective of the pipeline orientation (horizontal or vertical). This position helps to prevent
the trapping of bubbles or solids on the meter – allowing the solids to sink and the bubbles to rise.

Installation Manual 11

B

A

STATUS

SCROLL SELECT

Plan view of a vertical pipe installation

Mounting

Free-stream (flanged fitting) meter installationFigure 2-1:

A. 4-inch pipe for horizontal installations; 6-inch (152 mm) pipe for vertical installations
B. Size the recess mount so that the meter tines are inserted fully into the liquid [approximately 2.75 in

(70 mm)].

2.2 Mount in free-stream application (weldolet fitting)

The weldolet for free-stream installations has a 1.5-inch taper lock fitting and is supplied to
be welded on 4-inch, 6-inch, 8-inch or 10-inch pipelines. A weldolet installation ensures
that the tines of the meter are oriented correctly and are fully inserted into the fluid
stream.

Prerequisites

• Free-stream (weldolet) installations are recommended for processes with the

following conditions:

Flow 0.3 to 0.5 m/s (at the meter)

Viscosity 0.5 to 12,500 cP

Temperature –50 °C to 200 °C (–58 °F to 392 °F)

–40 °C to 200 °C (–40 °F to 392 °F) in
hazardous areas

Note

If temperature variations are a critical factor in your process, the reduced thermal mass of the
taper-lock fitting of the weldolet can track changes in temperature more efficiently.

• Before fitting the weldolet, you must bore a 2.1 in (52.5 mm) diameter opening in

the pipeline to accept the meter. You must weld the weldolet to the pipeline
concentrically with the pre-bored hole.

12 Micro Motion Fork Viscosity Meter

STATUS

SCROLL SELECT

A

C

D

B

Plan view of a vertical pipe installation

Mounting

Procedure

See Figure 2-2 for information on installing the meter (with a weldolet fitting) in a free­stream application.

Important

You must always install the meter horizontally and oriented to allow flow in the gap between the
tines, irrespective of the pipeline orientation (horizontal or vertical). This position helps to prevent
the trapping of bubbles or solids on the meter – allowing the solids to sink and the bubbles to rise.

Free-stream (weldolet fitting) meter installationFigure 2-2:

A. 4-inch pipe for horizontal installations; 6-inch (152 mm) pipe for vertical installations
B. 2.1 in (52.5 mm) meter opening in pipeline
C. Weld
D. Free-stream weldolet (purchased to fit pipe diameter)

2.3 Mount with a T-piece (flanged fitting)

Prerequisites

• T-piece (flanged) installations are recommended for processes with the following

conditions:

Flow 0.3 to 0.5 m/s (at the pipe wall)

Viscosity 0.5 to 100 cP

Temperature - -50 °C to 200 °C (–58 °F to 392 °F)

- -40 °C to 200 °C (-40 °F to 392 °F) in

hazardous areas

Installation Manual 13

STATUS

SCROLL SELECT

B

A

C

Plan view of a vertical pipe installation

Mounting

Note

- Flow velocity at the pipe wall and fluid viscosity must be within the limits shown to ensure

that the fluid within the pocket is refreshed in a timely manner. This installation will not
respond as rapidly as the free-stream installation to step changes in viscosity.

- The thermal mass of the flanges may affect the response time of the meter to

temperature changes.

• Attach the PFA ring and circlip to the underside of the meter flange before installing

the meter in your application (see Section 2.7).

Procedure

See Figure 2-3 for information on installing the meter (with a flanged fitting) in a T-piece.

Size the T-piece so that the meter tines are retracted 1 in (25 mm) from the main pipe wall.
For higher flow rates, increase this by 0.4 in (10 mm) for every 1 m/s increase in the main
flow rate.

Important

You must always install the meter horizontally and oriented to allow flow in the gap between the
tines, irrespective of the pipeline orientation (horizontal or vertical). This position helps to prevent
the trapping of bubbles or solids on the meter – allowing the solids to sink and the bubbles to rise.

T-piece (flanged fitting) meter installationFigure 2-3:

A. 4-inch pipe or larger for horizontal or vertical installations
B. Distance of meter tines from main pipe wall is determined by the maximum flow rate of the process.
C. PFA ring and circlip

14 Micro Motion Fork Viscosity Meter

2.4 Mount with a flow-through chamber

Flow-through chambers are manufactured by Micro Motion, and are available with either
weld-prepared ends or with flange or compression fittings for connection into the process
pipelines. They are available with 1- inch NB, 2-inch NB, or 3-inch NB inlet and outlet pipes.

Important

The length of the inlet and outlet pipes must not be altered, otherwise the temperature response
and stability of the fitting may be adversely affected.

Prerequisites

Installations in flow-through chambers are recommended for processes with the following
conditions:

Flow Constant

• 10–30 l/min for 2-inch Schedule 40

calibration bore section

• 5–300 l/min for 3-inch Schedule 80

calibration bore section

Viscosity 0.5 to 1000 cP

Temperature –50 °C to 200 °C (–58 °F to 392 °F)

–40 °C to 200 °C (–40 °F to 392 °F) in hazardous
areas

Pressure 70 bar @ 204 °C, subject to process connections

Mounting

Important

• Flow velocity at the pipe wall and fluid viscosity must be within the limits shown to ensure

that the fluid within the pocket is refreshed in a timely manner. This installation will not
respond as rapidly as the free-stream installation to step changes in viscosity.

• The thermal mass of the flanges may affect the response time of the meter to temperature

changes.

Procedure

See Figure 2-4 for an example installation of a meter in a flow-through chamber.

Installation Manual 15

A

Mounting

Flow-through chamber meter installationFigure 2-4:

A. Optional temperature port

Note

• This flow-through chamber is a direct-insertion type chamber that does not have a thermowell and

uses a ¾-inch Swagelok connection.

• The three compression fittings on the flow pockets (½-inch drain, ¾-inch temperature probe, and 1-½-

inch mounting nut for the meter) are rated to above the working pressure of the flow pocket. The
fittings may be Swagelok or Parker.

2.5 Mount in an open tank (long-stem meter)

CAUTION!

Only the safe area version of the long-stem meter can be mounted in an open tank.

Procedure

1. Clamp the long-stem meter to a structure, positioning the clamp to determine the
insertion depth of the meter.

16 Micro Motion Fork Viscosity Meter

B

A

A

B

Mounting

Open-tank meter installation (long stem)Figure 2-5:

2. Confirm the meter tines are away from the tank wall.

Meter placement (away from tank wall)Figure 2-6:

A. 50 mm
B. 200 mm

3. Confirm the meter tines are immersed in fluid.

Installation Manual 17

AA

Mounting

Meter placement (immersed in fluid)Figure 2-7:

4. Confirm the meter tines are placed away from objects and disturbed flow.

Meter placement (distance from objects and disturbed flow)Figure 2-8:

A. 200 mm

5. If flow exists, confirm the meter tines are aligned so that the flow is directed towards
or through the gap between the tines.

18 Micro Motion Fork Viscosity Meter

Meter placement (flow direction through tine gap)Figure 2-9:

6. Confirm the meter tines are kept away from deposit buildup.

Mounting

Meter placement (away from deposit buildup)Figure 2-10:

2.6 Mount in a closed tank (long-stem meter)

1. Attach the long-stem meter using the fitted flange attachment (shipped with the
product).

Installation Manual 19

Mounting

Closed-tank installation (fitted flange attachment)Figure 2-11:

2. (Optional) To vary the insertion depth of the meter, mount the meter on a standoff
section that attaches to the flange (not provided).

20 Micro Motion Fork Viscosity Meter

B

A

A

B

Mounting

Closed-tank installation (with standoff)Figure 2-12:

A. Standoff height can vary (provided by customer)

3. Confirm the meter tines are away from the tank wall.

Meter placement (away from tank wall)Figure 2-13:

A. 50 mm
B. 200 mm

4. Confirm the meter tines are immersed in fluid.

Installation Manual 21

A

A

Mounting

Meter placement (immersed in fluid)Figure 2-14:

5. Confirm the meter placement has allowed for the flexing of the tank lid to prevent
the meter from being pushed towards a tank wall or into the path of disturbed flow.

Meter placement (allowance for tank lid flexing)Figure 2-15:

A. 200 mm

6. Confirm the meter tines are placed away from objects and disturbed flow.

22 Micro Motion Fork Viscosity Meter

AA

Mounting

Meter placement (distance from objects and disturbed flow)Figure 2-16:

A. 200 mm

7. If flow exists, confirm the meter tines are aligned so that the flow is directed towards
or through the gap between the tines.

Meter placement (flow direction through tine gap)Figure 2-17:

8. Confirm the meter tines are kept away from deposit buildup.

Installation Manual 23

Mounting

Meter placement (away from deposit buildup)Figure 2-18:

2.7 Attach the PFA ring and circlip

You attach the PFA ring (and circlip) around the boss on the underside of the meter flange
to center the meter tines within a 2-inch Schedule 40 or 80 pipe. The circlip holds the ring
in place.

Note

If you are using the Zirconium version of the meter, a self-locking PFA ring is provided and does not
require a circlip to keep it in place.

Procedure

See Figure 2-19 for information on attaching the PFA ring and circlip to the meter.

24 Micro Motion Fork Viscosity Meter

Attaching a PFA ring and circlipFigure 2-19:

B

A

C

A

A. Circlip (not provided with self-locking PFA rings)
B. PFA ring
C. PFA ring and circlip attached

Mounting

2.8 Rotate the electronics on the meter (optional)

You can rotate the transmitter on the meter up to 90°.

1. Using a 4 mm hex key, loosen the cap screw that holds the transmitter in place.

Component to secure transmitter in placeFigure 2-20:

A. M5 socket-head cap screw

2. Rotate the transmitter clockwise to the desired orientation up to 90°.

3. Secure the cap screw in place and tighten to 60 lb·in (6.8 N·m).

Installation Manual 25

B

C

D

A

D

E

Mounting

2.9 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 2-21:

A. Transmitter housing
B. Sub-bezel
C. Display module
D. Display screws
E. Display cover

Procedure

1. Power down the meter.

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.

26 Micro Motion Fork Viscosity Meter

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. Power up the meter.

Installation Manual 27

Mounting

28 Micro Motion Fork Viscosity Meter

3 Wiring

Topics covered in this chapter:

• Available output terminals and wiring requirements

• Explosion-proof/flameproof or non-hazardous output wiring

• Processor wiring for remote-mount 2700 FOUNDATION fieldbus™ option

• Wiring to external devices (HART multidrop)

• Wiring to signal converters and/or flow computers

3.1 Available output 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.

Wiring

For meters connecting to a remote-mount 2700 FOUNDATION fieldbus™ transmitter, you
must wire the meter to the remote-mount 2700 transmitter using a 4-wire cable
connection. See the processor wiring content in this manual for information on how to
wire the meter. Refer to the transmitter installation manual for information on wiring the
remote-mount 2700 FOUNDATION fieldbus™ transmitter.

The screw connectors for each output terminal accept a maximum wire size of 14 AWG
(2.5 mm2).

Important

• Output wiring requirements depend on whether the meter will be installed in a safe area or a

hazardous area. It is your responsibility to verify that the specific installation meets the 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/analog
single-loop wiring or HART multi-drop wiring.

Available transmitter outputsTable 3-1:

Output channels

Transmitter version

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

Discrete 4–20 mA + HART Discrete output Modbus/RS-485

Processor for remote-mount 2700
FOUNDATION fieldbus

™

A B C

Disabled Disabled Modbus/RS-485

Installation Manual 29

Wiring

3.2 Explosion-proof/flameproof or non-hazardous output wiring

3.2.1 Wire the Analog outputs version in an explosion-proof/ flameproof or non-hazardous area

CAUTION!

Meter installation and wiring should be performed by suitably trained personnel only in
accordance with the applicable code of practice.

Procedure

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

30 Micro Motion Fork Viscosity Meter

mA1+
HART

RS-485

PWR

mA2

AA
B

RS-485 A

RS-485 B

C

D

B

B

A

A

A

Wiring

Wiring the Analog outputs versionFigure 3-1:

A. 24 VDC
B. R

(250 Ω resistance)

load

C. HART-compatible host or controller; and/or signal device
D. Signal device

Note

For operating the milliamp outputs with a 24V supply, a maximum total loop resistance of 657

Ω

allowed.

CAUTION!

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the

meter be connected using a suitable instrumentation cable. The instrumentation cable should
have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all
cores. Where permissible, the overall screen should be connected to earth at both ends (360°
bonded at both ends). The inner individual screen(s) should be connected at only one end, the
controller end.

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable

ports should be fitted with metal blanking plugs.

Installation Manual 31

is

Wiring

3.2.2 Wire the Discrete output version in an explosion-proof/ flameproof or non-hazardous area

CAUTION!

Meter installation and wiring should be performed by suitably trained personnel only in
accordance with the applicable code of practice.

Procedure

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

32 Micro Motion Fork Viscosity Meter

mA1+
HART

RS-485

PWR

DO

AA
B

RS-485 A

RS-485 B

C

E

D

B

A

A

A

Wiring

Wiring the Discrete output versionFigure 3-2:

A. 24 VDC
B. R

(250 Ω resistance)

load

C. HART-compatible host or controller; and/or signal device

Ω

D. R

load

E. Discrete input device

Note

resistance recommended)

(500

• For operating the milliamp output with a 24V supply, a maximum total loop resistance of 657 Ω is

allowed.

• When operating the Discrete output with a 24 VDC power supply, a maximum total loop resistance of

Ω

is allowed.

1300

CAUTION!

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the

meter be connected using a suitable instrumentation cable. The instrumentation cable should
have individual screen(s), foil or braid over each twisted pair and an overall screen to cover all
cores. Where permissible, the overall screen should be connected to earth at both ends (360°
bonded at both ends). The inner individual screen(s) should be connected at only one end, the
controller end.

Installation Manual 33

Wiring

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable

ports should be fitted with metal blanking plugs.

3.3 Processor wiring for remote-mount 2700
FOUNDATION fieldbus™ option

3.3.1 RS-485 entity parameters for the remote-mount 2700
FOUNDATION fieldbus™ option

DANGER!

Hazardous voltage can cause severe injury or death. To reduce the risk of hazardous voltage,
shut off power before wiring the meter.

DANGER!

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.

RS-485 output and cable entity parametersTable 3-2:

Cable parameters for intrinsically safe circuit (linear)

Voltage (Ui) 17.22 VDC

Current (Ii) 484 mA

Maximum capacitance (Ci) 1 nF

Maximum inductance (Li) Negligible

Cable parameters for Ex ib IIB, Ex ib IIC

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

Maximum external capacitance (Co) 85 nF

Maximum external inductance (Lo) 25 µH

Maximum external inductance/resistance ratio
(Lo/Ro)

31.1 µH/Ω

Cable parameters for Group IIB

Maximum external capacitance (Co) 660 nF

34 Micro Motion Fork Viscosity Meter

RS-485 output and cable entity parameters (continued)Table 3-2:

Maximum external inductance (Lo) 260 µH

Maximum external inductance/resistance ratio
(Lo/Ro)

3.3.2 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.

Wiring

124.4 µH/Ω

Installation Manual 35

Wiring

4-wire cable preparationFigure 3-3:

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

36 Micro Motion Fork Viscosity Meter

Wiring

4-wire cable shieldingFigure 3-4:

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

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 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:

Installation Manual 37

A

B

C

D

Wiring

• 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 gauge of 22 AWG or larger, with a maximum cable length of 1000 feet.

3.3.3 Processor wiring for the remote-mount 2700
FOUNDATION fieldbus™ option

The following figure illustrates how to connect the individual wires of a 4-wire cable to the
processor terminals. For detailed information on mounting and wiring to the remote­mount 2700 FOUNDATION fieldbus transmitter, see the transmitter installation manual.

Figure 3-5:

Processor (Modbus/RS-485) connections to the remote-mount 2700 FF
transmitter

A. White wire to RS-485/A terminal
B. Green wire to RS-485/B terminal
C. Red wire to Power supply (+) terminal
D. Black wire to Power supply (–) terminal

Important

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the

meter be connected using a suitable instrumentation cable. The instrumentation cable should have
individual screen(s), foil or braid over each twisted pair and an overall screen to cover all cores.
Where permissible, the overall screen should be connected to earth at both ends (360° bonded at
both ends). The inner individual screen(s) should be connected at only one end, the controller end.

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable

ports should be fitted with metal blanking plugs.

38 Micro Motion Fork Viscosity Meter

3.4 Wiring to external devices (HART multidrop)

You can wire up to three external HART devices with the meter. The following information
provides wiring diagrams for making those connections in safe and hazardous
environments.

Wiring

Installation Manual 39

250 Ω

24 VDC

mA1+

HART

A

B

C

E

D

Wiring

3.4.1 Wire external HART devices in an explosion-proof/ flameproof or non-hazardous area

Wiring external devices in an explosion-proof/flameproof or non-hazardous areaFigure 3-6:

A. HART Device 1
B. HART Device 2
C. HART Device 3
D. Meter (mA+/HART output)
E. HART/Field Communicator

CAUTION!

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that the meter be connected

using a suitable instrumentation cable. The instrumentation cable should have individual screen(s), foil or braid
over each twisted pair and an overall screen to cover all cores. Where permissible, the overall screen should be
connected to earth at both ends (360° bonded at both ends). The inner individual screen(s) should be connected at
only one end, the controller end.

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable ports should be

fitted with metal blanking plugs.

40 Micro Motion Fork Viscosity Meter

3.5 Wiring to signal converters and/or flow computers

For meters with a Time Period Signal (TPS) output, you can wire the meter to an signal
converter or flow computer directly. The following information provides wiring diagrams
for making those connections in safe and hazardous environments.

When wiring the meter to an active HART host or signal converter/flow computer, you are
not required to provide external power to the output connections. These active devices
provide the 24 VDC necessary for these connections.

Wiring

Installation Manual 41

mA1+
HART

RS-485

PWR

TPS

AA

B

24 VDC

RS-485 A

RS-485 B

A

B

Wiring

3.5.1 Wire to a signal converter/flow computer in an explosion-proof/flameproof or non-hazardous area

Figure 3-7:

Wiring to a signal converter/flow computer in an explosion-proof/
flameproof or non-hazardous area

A. Active HART host
B. Active signal converter/flow computer

CAUTION!

• To meet the EC Directive for EMC (Electromagnetic Compatibility), it is recommended that

the meter be connected using a suitable instrumentation cable. The instrumentation cable
should have individual screen(s), foil or braid over each twisted pair and an overall screen to
cover all cores. Where permissible, the overall screen should be connected to earth at both
ends (360° bonded at both ends). The inner individual screen(s) should be connected at only
one end, the controller end.

• Metal cable glands should be used where the cables enter the meter amplifier box. Unused

cable ports should be fitted with metal blanking plugs.

42 Micro Motion Fork Viscosity Meter

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 or tank installation.

- If the joints in the pipeline or tank are ground-bonded, the meter is automatically

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

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

grounding screw located on the meter electronics.

Installation Manual 43

Grounding

44 Micro Motion Fork Viscosity Meter

Grounding

Installation Manual 45

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

*MMI-20020994*

MMI-20020994

Rev AA

2013

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]

©

2013 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 Process
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