Aquametro Oil & Marine Viscomaster User manual

Version: VD 7-425 02.2021
Installation and Operation Manual
Visco
sity Control System
Viscomaster™ / Viscomaster™ Dynamic
Fuel Viscosity System

2 VCS - Viscomaster™
Content
1 Introduction......................................................................................................................................... 3
1.1 Liability Disclaimer ..............................................................................................................................................................................3
1.2 Safety precautions...............................................................................................................................................................................3
1.3 Receiving and Storage Requirements .........................................................................................................................................4
2Application.................................................................................................................................... 4
2.1 Description of Viscomaster™ Sensor...........................................................................................................................................4
3Viscosity Sensor installation / implementation ........................................................................ 5
3.1 Planning...................................................................................................................................................................................................5
3.1.1 Installation checklist.....................................................................................................................................................................6
3.1.2 Best practices..................................................................................................................................................................................6
3.1.3 Power requirements.....................................................................................................................................................................6
3.1.4 Other installation considerations............................................................................................................................................7
3.1.5 Perform a pre-installation meter check.............................................................................................................................12
3.2 Mounting ............................................................................................................................................................................................. 12
3.2.1 Prepare the installation............................................................................................................................................................13
3.2.2 Mount the meter........................................................................................................................................................................13
3.2.3 Rotate the electronics on the meter (optional)..............................................................................................................18
3.2.4 Rotate the display on the transmitter (optional)...........................................................................................................18
3.3 Wiring.................................................................................................................................................................................................... 19
3.3.1 Terminals and wiring requirements ....................................................................................................................................19
3.3.2 Wire power and outputs in Signal device and Modbus Environment ..................................................................20
3.3.3 Grounding..................................................................................................................................................................................... 21
4Viscomaster Operation .............................................................................................................. 22
4.1 Putting into Operation ................................................................................................................................................................... 22
4.2 Check meter status .......................................................................................................................................................................... 22
4.3 Configure Modbus communication ..........................................................................................................................................23
5Maintenance and Repair............................................................................................................ 25
5.1 Calibration ...........................................................................................................................................................................................25
5.2 Service maintenance .......................................................................................................................................................................25
5.3 Spare Parts ..........................................................................................................................................................................................27
6Troubleshooting ......................................................................................................................... 28
7Decommissioning, Dismantling and Disposal ......................................................................... 31
7.1 Decommissioning............................................................................................................................................................................. 31
7.2 Dismantling.........................................................................................................................................................................................31
7.3 Return of materials........................................................................................................................................................................... 31
7.4 Disposal................................................................................................................................................................................................32
8Technical Data ............................................................................................................................ 32
8.1 Viscomaster.........................................................................................................................................................................................32
8.2 Dimensional drawings .................................................................................................................................................................... 33
8.3 Electrical Connection diagrams...................................................................................................................................................34
9Appendix ..................................................................................................................................... 40
9.1 Using the transmitter display (Option) ....................................................................................................................................40
9.1.1 Components of the transmitter interface.........................................................................................................................40
9.1.2 Use the optical switches..........................................................................................................................................................40
9.1.3 Access and use the display menu system ........................................................................................................................41
9.2 Display operation ............................................................................................................................................................................. 42
9.2.1 View process variables using the display .........................................................................................................................42
9.2.2 View and acknowledge status alerts ..................................................................................................................................42
9.2.3 You can control the process variables shown on the display and a variety of display behaviors. ............ 45
9.3 Display codes and abbreviations................................................................................................................................................45

VCS - Viscomaster™ 3
1 Introduction
Thank you for your decision to work with Aquametro Oil & Marine Viscosity System (VM).
This manual describes the installation, commissioning and use of ViscomasterTM Sensor of the Aquametro
Viscosity System. For additional information, please contact your local sales agent.
1.1 Liability Disclaimer
The manufacturer cannot monitor the compliance to this manual as well as the conditions and methods during
the installation, operation, usage and maintenance of the system regulator.
Improper installation can cause damages and endanger people. Therefore, we assume no responsibility and
liability for losses, damages or costs that result due to incorrect installation, improper operation, usage and
maintenance or in any manner associated therewith. Similarly, we assume no responsibility for patent right or
other right infringements of third parties caused by usage of this system regulator. The manufacturer reserves
the right, without prior notification, to make modifications concerning the product, technical data or installation
and operating manual.
1.2 Safety precautions
Viscosity Control System components must only be used for their intended purpose and comply with local and
international safety regulations. All documentation is to be followed exactly. None of the information stated
here or elsewhere releases planners, installers and operators from their own careful and comprehensive
assessment of the respective plant configuration in terms of functional capability and operational safety.
Local applicable working regulations must be complied with, during all work on the plant and/or ship.
All safety-, installation- and operation instruction as described in this manual must be followed.
Sensors, actuators and control valves are sensitive instruments and should be treated carefully.
When removing or reinstalling sensors or components from the Viscomaster System, safety instructions in
the respective operating manual must be followed.
Check the Viscosity Control System parts periodically for tightness of the connections and for proper
functioning.
The unit must be installed to 110 VAC or 230 VAC according to wiring diagram.
Electrical wiring and installations are subject to statutory regulations, which must be taken into account
when planning the system.
Viscosity Control System is not for installation in zones subject to explosion hazards.
If work is to be done on the installation, before each intervention release the pressure in the installation
This manual provides instruction for installation, start-up and operation of Aquametro Viscosity Control System
part ViscomasterTM Sensor.
It is essential that this manual be thoroughly reviewed, with full comprehension of the
matters explained herein, before attempting installation and start-up.
The materials and workmanship incorporated into the Aquametro Oil & Marine Viscosity Control System are
designed to provide trouble-free service throughout the equipment lifetime. However, like any rotating
equipment, satisfactory performance depends on correct initial sizing, proper installation and periodic
inspection, monitoring of operating conditions (pressure, temperature, vibration, flow and electric power) and
prescribed maintenance. This Manual has been prepared to assist the operator in understanding the workings of
the Viscomaster® Sensor and provide direction for proper installation, start-up, operation and maintenance.

4 VCS - Viscomaster™
IMPORTANT SAFETY INFORMATION
WORK SAFE SYMBOL
This symbol will appear in this manual at all remarks for operational safety, where risks
for health and life of personnel exist. Observe these points and proceed with caution in
these cases.
Cautions should be identified to other users.
ATTENTION NOTICE
This symbol will appear in this manual where special attention must be paid in
order to maintain a correct operating procedure and to avoid damage to the
Viscosity Control System components and/or other plant equipment.
1.3 Receiving and Storage Requirements
Inspect Viscosity Control System components and separate delivered parts as soon as it is received.
Make notes and photos of damage (also package damages) or missing items.
File any claims with the transportation company immediately and notify vendor of the damages.
Normal packaging is designed to protect Viscosity Control System components and separate parts during
shipping and storage. Upon receipt at customers’ warehouse, store ViscomasterTM System components and
separate parts indoors, in a sheltered and dry location.
2Application
The Aquametro Oil & Marine Viscomaster Sensor is built to tackle the most demanding process and marine
applications in viscosity control systems. It is built for the use in fuel oil systems to achieve high accurate
measurements and control of the fuel oil viscosity.
Rugged and reliable with very low maintenance, the sensor provides fully integrated “fit and forget”
viscosity measurement.
With available Retrofit kits for easy replacement of existing viscosity meter the greatest installation
flexibility is given.
A Viscomaster™ may be part of a complete Aquametro Viscosity Control System. For instructions covering the
other components of this system, refer to the separate MBA as supplied with these components.
2.1 Description of Viscomaster™ Sensor
The Aquametro HFVM Viscosity sensor family is a proven technology for the accurate, continuous real-time
measurement and control of liquid viscosity. The HFVM Viscosity sensor has been designed for installation in
fuel oil applications that supply engines, turbines, and burners in onshore and off-shore applications.
As part of its unique and rugged design, the HFVM Viscosity sensor directly measures dynamic viscosity and
temperature/density. The meter is also programmable to output calculated density and kinematic viscosity
measurements.
The HFVM Viscosity sensor can easily cope with a range of fuels from heavy fuel oil (HFO) to marine gas oil
(MGO) and has worldwide marine industry approvals including Lloyds Register, GL, DNV, ABS, and BV.

VCS - Viscomaster™ 5
Advantages
Fully integrated “fit and forget” digital viscosity and temperature measurement for monitoring and control
Two 4–20 mA outputs of kinematic viscosity and temperature/density
Modbus/RS-485 communications output of all parameters, including calculated density and calculated
kinematic viscosity at operating temperature
Continuous measurement
No moving parts means virtually no maintenance
PFA-coated tines for asphaltene rich fuels
Integral Class B PT100 temperature sensor
Hazardous-area approved (ATEX and CSA)
Insensitive to vibration
Direct insertion meter suitable for high-line pressure
PC configuration tools for diagnostics and data logging
Controller with preadjusted selectable functions
Adapter for existing Viscosity system or direct insertion
Matched components for easy installation
Scope of Supply
Viscomaster HFVM-B Viscosity Sensor Dynamic
For viscosity and temperature measurements
HFVM-R Viscosity Sensor
For viscosity and density measurements
Standard
Adapter
In-Line
The In-Line viscosity retrofit kit provides a simple, direct replacement for
existing meters and the installation solution for new building
Flow
Through
Chamber
The capillary viscosity retrofit kit provides a simple, direct replacement for
existing capillary meters
Flange
The flange adapter viscosity retrofit kit provides a simple, direct
replacement for existing VAF or Nakakita viscosity meters
3Viscosity Sensor installation / implementation
3.1 Planning
Topics covered in this chapter:
Installation checklist
Best practices
Power requirements
Other installation considerations
Recommended installations for the HFVM
Perform a pre-installation meter check

6 VCS - Viscomaster™
3.1.1 Installation checklist
Verify the contents of the product shipment to confirm that you have all parts and information necessary for
the installation.
Verify that the meter calibration-type code corresponds to the pipe size. If it does not, measurement
accuracy may be reduced due to the boundary effect.
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.
3.1.2 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.
If you have an HFVM with calibration code B (viscosity and density calibration), perform a Known Density
Verification (KDV) check of the meter prior to installing the meter.
For the DLC-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.
Do not use liquids that are 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 that operating conditions correspond to the meter
calibration-type code and boundary.
Ensure that all piping connections conform to the local and national regulations and codes of practice.
Follow fluid velocity guidelines and install the tines vertically for side insertion.
Properly tighten the transmitter housing cover after wiring to maintain ingress protection and hazardous
area approvals.
After installation, pressure test the meter and the associated pipework to 1½ times the maximum
operating pressure.
Install thermal insulation in the meter, the inlet, and the bypass-loop pipeline to maintain stable
temperatures. The thermal insulation should cover the process connection.
3.1.3 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.

VCS - Viscomaster™ 7
Power cable recommendations for explosion-proof/flameproof meters
3.1.4 Other installation considerations
Numerous external factors can affect the meter's successful operation. To ensure that your system works
correctly, consider the factors covered in this section when designing your installation.

8 VCS - Viscomaster™
3.1.4.1 Boundary effect
Boundary effect refers to the distortion in the wave forms in the process fluid that are caused by reflections from
the pipe wall. If the pipe wall is within the meter's effective measurement region, the boundary effect produces
measurement inaccuracy.
The factory calibration compensates for the boundary effect. The meter can be calibrated for 2-inch, 2.5-inch, or
3-inch pipe. If the meter is installed in a pipe, that does not match the calibration size, the compensation will be
inaccurate, and process measurement will be inaccurate.
Verify that the meter was calibrated for the pipe size you plan to use.
3.1.4.2 Flow rates
Maintain constant flow rates and velocities that are 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, the dissipation of bubbles, and the solid contaminants around the meter.
If you install the meter in a bypass configuration (such as in a flow-through chamber), use a pressure drop, pitot
scoop, or a sample pump to maintain flow. When using a sample pump, place the pump upstream from the
meter.
3.1.4.3 Entrained gas
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.

VCS - Viscomaster™ 9
To minimize the possibility of entrained gas:
Keep pipelines full of fluid at all times.
Vent any gas prior to the meter installation location.
Avoid sudden pressure drops or temperature changes that may cause dissolved gases
to break out of the fluid.
Maintain a back pressure on the system that is sufficient to prevent gas breakout.
Maintain flow velocity at the sensor within the specified limits.
3.1.4.4 Solid contamination
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.
3.1.4.5 Temperature gradients and insulation
For high-viscosity fluids, 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. Aquametro Oil & Marine recommends using the following guidelines to reduce the thermal
effects to your meter installation:
Always insulate the meter and surrounding pipework thoroughly.
- Avoid insulating the transmitter housing.
- Use rock wool or any equivalent heat jacket material that is at least 1 inch (25 mm) thick, but
preferably 2 inches (50 mm) thick.
- Enclose insulation in a sealed protective casing to prevent moisture ingress, air circulation, and
crushing of the insulation.
- For flow-through chamber installations, use the special insulation jacket provided by Aquametro
Oil & Marine.
Avoid direct heat or cold on the meter or on the associated upstream or downstream pipe work that is
likely to create temperature gradients.
If it is necessary to protect against cooling because of flow loss, you can apply electrical-trace heating. If
you use electrical-trace heating, use a thermostat that operates below the minimum operating
temperature of the system.

10 VCS - Viscomaster™
ATTENTION!
Insulation must be carried out to minimize any temperature gradients in the
fluid, and in the piping and fittings immediately upstream and downstream
of the meter
Table 1-2: Standard HFVM installation types
Type
Characteristics
Advantages
Inline viscosity
Placement
Tines are contained in a side
pocket
off the main flow, recessed by 25.4
mm (1 in)
Simple replacement of
torsional meter
Fast response
Good flow and
temperature conditioning
Flow rate(1)
10 to 330 l/min
(0.6 to 20 m3/hr)
(2.6 to 87 US gal./min)
Viscosity Up to 100 cSt
Temperature –50 °C to 200 °C
(–58 °F to 392 °F)
Main flow pipe size 50 mm (2 in)
Flow-through chamber
Placement
Tines are contained in a flow-
through
chamber where fluid is circulated
from the main flow
Adaptable installation to
any diameter main pipe
and for tank applications
Ideal for flow and
temperature conditioning
Fast response
Flow rate(1)
10 to 330 l/min
(0.6 to 20 m3/hr)
(2.6 to 87 US gal./min)
Viscosity
Up to 100 cSt
Temperature –50 °C to 200 °C
(–58 °F to 392 °F)
Main flow pipe size
50 mm (2 in)

VCS - Viscomaster™ 11
Capillary viscosity
Placement
Tines project into adapter kit with
63.5 mm (2.5 in) Schedule 40
boundary
Simple replacement of
capillary meter
Fast response
Good flow and
temperature conditioning
Flow rate(1)
10 to 330 l/min
(0.6 to 20 m3/hr)
(2.6 to 87 US gal./min)
Viscosity
Up to 100 cSt
Temperature
–50 °C to 200 °C
(–58 °F to 392 °F)
Main flow pipe size
Defined by capillary meter
chamber
Direct Insertion
Placement
The fork should be fully inserted
into the main flow path up to the
weld bead
The AM Viscomaster is not
calibrated for direct
insertion
Flow rate
Velocity < 1.5ft/sec
(0.5m/s)
Viscosity
Up to 100cSt
Temperature –50 °C to 200 °C
(–58 °F to 392 °F)
Main Flow Pipe size
6” or larger vertical pipe or side of
4” or larger horizontal pipe

12 VCS - Viscomaster™
3.1.5 Perform a pre-installation meter check
1. Remove the meter from the box.
CAUTION!
Handle the meter with care. Follow all corporate, local, and national
safety regulations for lifting and moving the meter.
2. Visually inspect the meter for any physical damage. If you notice any physical damage to the meter,
immediately contact Aquametro Oil & Marine support at [e-mail].
3. Connect the power wiring, and power up the meter. Remove the back transmitter housing cover to
access the PWR terminals.
4. If you have an HFVM with calibration code B (viscosity and density calibration), perform a Known
Density Verification (KDV) check. Use the Known Density Verification procedure to match the current
meter calibration with the factory calibration. If the meter passes the test, then it has not drifted or
changed during shipment.
3.2 Mounting
Topics covered in this chapter:
Prepare the installation
Mount the meter
Install thermal insulation
Rotate the electronics on the meter (optional)
Rotate the display on the transmitter (optional)

VCS - Viscomaster™ 13
3.2.1 Prepare the installation
Before you can install the meter and fit the thermal insulation, verify that the system is stable and leak free.
1. Fit a blanking compression nut to the meter mounting, pressurize, and flush the system.
2. Isolate the system, depressurize, and remove the blanking compression nut.
Adjustment of and work on the Meter may only be done by skilled labor.
Observe local instructions and safety regulation.
3.2.2 Mount the meter
There are three (plus one) ways to mount the meter.
Related information
Mount with a flow-through chamber
Mount with an inline viscosity retrofit kit
Mount with a capillary viscosity retrofit kit
3.2.2.1 Mount with a flow-through chamber
Flow-through chambers are manufactured by Aquametro Oil & Marine, and are available with either of the
following:
Welded ends or compression fittings that connect into the process pipelines
1- inch, 2-inch, or 3-inch inlet and outlet pipes
IMPORTANT
Do not alter the length of the inlet and outlet pipes. Pipe alterations can adversely
affect the fitting, temperature response and stability.
Prerequisites
Verify the following conditions:
Flow
• 5–40 l/min for 2-inch Schedule 40 calibration bore section
(1.5 - 10.5 gal/min)
• 5–300 l/min for 3-inch Schedule 80 calibration bore section
(1.5 – 80 gal/min)
Viscosity
0.5 to 100 cSt
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
IMPORTANT
To ensure that the fluid within the pocket is refreshed in a timely manner, verify that flow
velocity at the pipe wall and fluid viscosity are within the limits described in this table.
The thermal mass of the flanges may affect the response time of the meter to
temperature changes.

14 VCS - Viscomaster™
Procedure
3.2.2.2 Mount with an inline viscosity retrofit kit
The inline viscosity retrofit kit provides a simple, direct replacement for existing meters.
Typically, the flange-to-flange distance is 150 mm (5.9 in), although Aquametro Oil & Marine can accommodate
larger versions. Usually, no pipework changes are necessary.
CAUTION!
Observe all corporate and government safety regulations. Wear protective clothing,
safety glasses, and gloves to prevent burns and the absorption of hot oil.
Prerequisites
Verify the following conditions:
Temperature
–50 °C to 200 °C (–58 °F to 392 °F)
Flow
40 to 330 l/min
2.5 to 20 m3/hr
11 to 87 US gal/min
Viscosity
Up to 100 cSt
Pressure
As defined by process flanges
Calibration
boundary
2.5 in Schedule 40

VCS - Viscomaster™ 15
Procedure
1. Check that the isolation valves are fully closed.
2. Remove insulation and allow the equipment to cool to a safe level.
Cooling reduces retained pressure.
3. If you have a drain or a pressure-relieving valve, depressurize the system.
4. Slacken the lock nut 1 ½ to 2 turns so that you can rock the sensor.
If necessary, use your hand to jolt the meter loose from the amplifier housing. This breaks the seal between
the sensor and the chamber retrofit kit. Do not slacken the lock nut further unless the seal is broken and the
sensor is obviously loose in the fitting.
NOTE!
If the system is still pressurized, you will be able to lift and hold the meter against the retaining nut.
Rocking and alternately pushing the sensor in and out of the pocket within the limits allowed by
the slackened nut breaks the seal and allows oil under pressure to seep past the lock nut. If this
leakage is excessive, re-tighten the lock nut and take further action to depressurize the system.
5.
CAUTION
Keep all parts of your body away from the direction in which you will remove the sensor. Pressure
caused by a valve failure or a poorly placed lock nut can eject the instrument from the flow chamber
and cause serious injury.
6. Retrofit the meter per the following diagram.

16 VCS - Viscomaster™
3.2.2.3 Mount with a capillary viscosity retrofit kit
The capillary viscosity retrofit kit provides a simple, direct replacement for existing capillary meters.
Typically, capillary meters operate with their own measurement chamber that attaches to the HFVM. No
pipework changes are necessary.
CAUTION
Observe all corporate and government safety regulations. Wear protective clothing,
safety glasses, and gloves to prevent burns and the absorption of hot oil
Prerequisites
Verify the following conditions:
Temperature
–50 °C to 200 °C (–58 °F to 392 °F)
Flow
40 to 330 l/min
2.5 to 20 m3/hr
11 to 87 US gal/min
Viscosity
Up to 100 cSt
Pressure
As defined by process flanges
Calibration
boundary
2.5 in Schedule 40
Procedure
1. Check that the isolation valves are fully closed.
2. Remove insulation and allow the equipment to cool to a safe level.
Cooling reduces retained pressure.
3. If you have a drain or a pressure-relieving valve, depressurize the system.
4. Slacken the lock nut 1 ½ to 2 turns so that you can rock the sensor.
If necessary, use your hand to jolt the meter loose from the amplifier housing. This breaks the seal between
the sensor and the chamber retrofit kit. Do not slacken the lock nut further unless the seal is broken and the
sensor is obviously loose in the fitting.
NOTE!
If the system is still pressurized, you will be able to lift and hold the meter against the retaining
nut. Rocking and alternately pushing the sensor in and out of the pocket within the limits
allowed by the slackened nut breaks the seal and allows oil under pressure to seep past the
lock nut. If this leakage is excessive, re-tighten the lock nut and take further action to
depressurize the system.
5.
CAUTION
Keep all parts of your body away from the direction in which you will remove the
sensor. Pressure caused by a valve failure or a poorly placed lock nut can eject the
instrument from the flow chamber and cause serious injury.
Remove the lock nut if you can rock the meter in the flow chamber, and there is no serious or continuous
escape of oil.
6. Retrofit the meter per the following diagram.

VCS - Viscomaster™ 17
3.2.2.4 Mount as direct insertion
The direct insertion retrofit is not recommendable due to severe restrictions about the flow rate and calibration
boundaries. For Direct Insertion Aquametro Oil & Marine does not take any responsibility for accuracy and
lifetime. For direct insertion, no adapter is available.

18 VCS - Viscomaster™
3.2.3 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.
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).
3.2.4 Rotate the display on the transmitter (optional)
The display on the transmitter electronics module can be rotated 90° or 180° from the original position.

VCS - Viscomaster™ 19
Procedure
1. If the meter is powered up, power it down.
2. Turn the display cover counterclockwise to remove it from the main enclosure.
3. Carefully loosen (and remove if necessary) the semi-captive display screws while holding the display
module in place.
4. Carefully pull the display module out of the main enclosure until the sub-bezel pin terminals are
disengaged from the display module.
NOTE!
If the display pins come out of the board stack with the display module, remove the pins
and reinstall them.
5. Rotate the display module to the desired position.
6. Insert the sub-bezel pin terminals into the display module pin holes to secure the display in its new
position.
7. If you have removed the display screws, line them up with the matching holes on the sub-bezel, then
reinsert and tighten them.
8. Place the display cover onto the main enclosure.
9. Turn the display cover clockwise until it is snug.
10. If appropriate, power up the meter.
3.3 Wiring
Topics covered in this chapter:
Terminals and wiring requirements
Wire power and outputs in a HART single-loop environment
Wiring to external devices (HART multidrop)
3.3.1 Terminals and wiring requirements
Three pairs of wiring terminals are available for transmitter outputs. A fourth pair is used for power wiring. These
outputs vary depending on your transmitter output option ordered. The mA outputs require external power, and
must be connected to an independent 24 VDC power supply.
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 this installation meets all corporate,
local, and national safety requirements and electrical codes.
If you will configure the meter to poll an external temperature or pressure device, you must
wire the mA output to support HART communications. You may use either HART/mA single-
loop wiring or HART multi-drop wiring.

20 VCS - Viscomaster™
3.3.2 Wire power and outputs in Signal device and Modbus Environment
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 power and output terminals and pins (see Figure 3-2).