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