Micro Motion® Fork Density Meters
Direct insertion density meter installation
Installation Manual
MMI-20020989, Rev AE
May 2019
Safety messages
Safety messages are provided throughout this manual to protect personnel and equipment. Read each safety message carefully
before proceeding to the next step.
Other information
Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the configuration
manual. Product data sheets and manuals are available from the Micro Motion web site at www.emerson.com.
Return policy
Follow Micro Motion procedures when returning equipment. These procedures ensure legal compliance with government
transportation agencies and help provide a safe working environment for Micro Motion employees. Micro Motion will not accept
your returned equipment if you fail to follow Micro Motion procedures.
Return procedures and forms are available on our web support site at www.emerson.com, or by phoning the Micro Motion
Customer Service department.
Emerson Flow customer service
Email:
• Worldwide: flow.support@emerson.com
• Asia-Pacific: APflow.support@emerson.com
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 +1 303-527-5200 The Netherlands +31 (0) 704 136
Mexico +41 (0) 41 7686
111
Argentina +54 11 4837 7000 Germany 0800 182 5347 Pakistan 888 550 2682
Brazil +55 15 3413 8000 Italy 8008 77334 China +86 21 2892 9000
France 0800 917 901 India 800 440 1468
Central & Eastern +41 (0) 41 7686
Russia/CIS +7 495 981 9811 South Korea +82 2 3438 4600
Egypt 0800 000 0015 Singapore +65 6 777 8211
Oman 800 70101 Thailand 001 800 441 6426
Qatar 431 0044 Malaysia 800 814 008
Kuwait 663 299 01
South Africa 800 991 390
Saudi Arabia 800 844 9564
UAE 800 0444 0684
666
111
New Zealand 099 128 804
Japan +81 3 5769 6803
2
Installation Manual Contents
MMI-20020989 May 2019
Contents
Chapter 1 Before you begin............................................................................................................5
1.1 About this manual............................................................................................................................ 5
1.2 Related documentation....................................................................................................................5
Chapter 2 Planning........................................................................................................................ 7
2.1 Installation checklist.........................................................................................................................7
2.2 Best practices................................................................................................................................... 8
2.3 Power requirements......................................................................................................................... 8
2.4 Other installation considerations....................................................................................................10
2.5 Recommended installations for short-stem meters........................................................................ 12
2.6 Perform a pre-installation meter check...........................................................................................14
Chapter 3 Mounting.....................................................................................................................17
3.1 Free stream applications.................................................................................................................17
3.2 T-piece applications........................................................................................................................21
3.3 Mount with a flow-through chamber..............................................................................................26
3.4 Mount in an open tank (long-stem meter)...................................................................................... 28
3.5 Mount in a closed tank (long-stem meter)...................................................................................... 31
3.6 Attach the PFA ring and circlip........................................................................................................ 35
3.7 Rotate the electronics on the meter (optional)............................................................................... 36
3.8 Rotate the display on the transmitter (optional)............................................................................. 37
Chapter 4 Wiring......................................................................................................................... 39
4.1 Terminals and wiring requirements................................................................................................ 39
4.2 Explosion-proof/flameproof or non-hazardous output wiring......................................................... 39
4.3 Processor wiring for remote-mount 2700 fieldbus..........................................................................43
4.4 Wiring to external devices (HART multidrop)..................................................................................48
4.5 Wiring to signal converters and/or flow computers........................................................................ 49
Chapter 5 Grounding....................................................................................................................51
Installation Manual iii
Contents Installation Manual
May 2019 MMI-20020989
iv Micro Motion Fork Density Meter
Installation Manual Before you begin
MMI-20020989 May 2019
1 Before you begin
1.1 About this manual
This manual provides information on planning, mounting, and wiring the FDM.
Important
This manual assumes that the following conditions apply:
• The device has been installed correctly and completely according to the instructions in
the installation manual
• The installation complies with all applicable safety requirements
• The user is trained in government and corporate safety standards
1.2 Related documentation
You can find all product documentation on the product documentation DVD shipped with
the product or at www.emerson.com.
See any of the following documents for more information:
• Micro Motion Fork Density Meters (FDM) Product Data Sheet
• Micro Motion Fork Density Meters (FDM) Configuration and Use Manual
• Micro Motion Fork Density Meters (FDM) with FOUNDATION™ Fieldbus Configuration and Use
Manual
• Micro Motion Model 1700 and 2700 Installation Manual
• Modbus Interface Tool
• Micro Motion Enhanced Density Application Manual
Installation Manual 5
Before you begin Installation Manual
May 2019 MMI-20020989
6 Micro Motion Fork Density Meter
Installation Manual Planning
MMI-20020989 May 2019
2 Planning
2.1 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.
□ If your meter will be wired to a remote-mount 2700 FOUNDATION
— 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 fieldbus transmitter.
— Consider the maximum cable length between the meter and transmitter. The
maximum recommended distance between the two devices is 1,000 ft (305 m).
Use Micro Motion cable.
™
Fieldbus transmitter:
Installation Manual 7
Planning Installation Manual
May 2019 MMI-20020989
2.2 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.
• 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. For the long-stem
meters, be sure to include the transit cover secured by the grub screws.
• 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.
• 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.
2.3 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 1,000 ft (305 m) of 24 AWG
(0.205 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.
8 Micro Motion Fork Density Meter
300ft 600ft 900ft 1200ft 1500ft 1800ft 2100ft 2400ft 2700ft 3000ft
B
2 1 . 6V
24 V
14
15
16
17
18
19
20
21
22
23
24
25
26
A
91.44m 182.88m 274.32m 365.76m 457.2m 548.64m 640.08m 731.52m 822.96m 914.4m
0 . 00 0
0.100
0.200
0.300
0.400
0.500
0.600
0.700
10 0m 20 0m 30 0m 40 0m 50 0m 60 0m 70 0m 80 0m 90 0m 100 0m
B
2 1 . 6V
24 V
A
328.084 ft 656.168ft 984.253ft 1312.34ft 1640.42ft 1968.5ft 2296.59ft 2624.67ft 2952.76ft 3280.84ft
Installation Manual
Planning
MMI-20020989 May 2019
Power cable recommendations for explosion-proof/flameproof meters
Figure 2-1: Minimum wire gauge (AWG per foot or meter)
A. AWG maximum
B. Distance of installation
Figure 2-2: Minimum wire area (mm2 per meter or foot)
Installation Manual 9
A. Minimum wire area (mm2)
B. Distance of installation
Planning
May 2019 MMI-20020989
Installation Manual
2.4 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.
2.4.1 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.
Figure 2-3: Region of measurement boundary or sensitivity (plan view)
2.4.2
2.4.3
A. Sensitive, or effective, region
The factory calibration compensates for the boundary effect. The meter can be calibrated
for free stream, 2 in (51 mm), 2.5 in (64 mm), or 3 in (76 mm) 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.
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 across an orifice plate in the main process pipe, a pitot scoop
arrangement, or a sample pump to maintain flow. When using a sample pump, place the
pump upstream from the meter.
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,
10 Micro Motion Fork Density Meter
Installation Manual
MMI-20020989 May 2019
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 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.
Planning
2.4.4 Slurry measurement
To ensure quality measurement when solids are present:
• 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).
2.4.5
• Maintain flow velocity at the meter installation that is within the specified limits.
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. Use 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 in (25 mm)
thick, but preferably 2 in (51 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 Micro Motion.
• 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.
2.4.6
Installation Manual 11
Pressure and temperature limits for process connections
You must ensure that the pressure and temperature limits for the meter are not exceeded
– if necessary, by the use of suitable safety accessories. Pressure and temperature ratings
Planning Installation Manual
May 2019 MMI-20020989
for the meter connections are in accordance with the relevant flange standard. Check the
latest standards for your connections.
For the pressure and temperature limits for Zirconium 702 process connections, see Table
2-1.
Table 2-1: Pressure/temperature ratings for Zirconium 702 process connections
Process
flange
type
2 in
(51 mm)
ANSI 150
2 in
(51 mm)
ANSI 300
DN50
PN16
DN50
PN40
Pressure and temperature ratings
100 °F (37.8 °C) 199.9 °F (93.28 °C) 299.8 °F (148.78 °C) 392 °F (200.0 °C)
226.3 psi
(15.603 bar)
588.9 psi
(40.603 bar)
229.2 psi
(15.803 bar)
571.5 psi
(39.404 bar)
197.3 psi
(13.603 bar)
513.4 psi
(35.398 bar)
175.5 psi
(12.100 bar)
439.5 psi
(30.302 bar)
159.5 psi
(10.997 bar)
417.7 psi
(28.799 bar)
137.8 psi
(9.501 bar)
342.3 psi
(23.601 bar)
110.2 psi
(7.598 bar)
336.5 psi
(23.201 bar)
1107.3 psi
(7.398 bar)
266.9 psi
(18.402 bar)
2.5 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.
Free stream applications
Flow rate
Viscosity Up to 20,000 cP
Temperature • -58 °F (-50.0 °C) to 392 °F (200.0 °C)
Main flow pipe size • Horizontal pipe: minimum diameter, 4 in (102 mm)
Advantages • Simple installation in large bore pipes
Recommendations Do not use with:
12 Micro Motion Fork Density Meter
0.3 to 0.5 m/s at the meter
• -40 °F (-40.0 °C) to 392 °F (200.0 °C) in hazardous areas
• Vertical pipe: minimum diameter, 6 in (152 mm)
• Ideal for clean fluids and non-waxing oils
• Suitable for line density measurement and simple referrals
• Low or unstable flow rates
• For small bore pipes
Installation Manual Planning
MMI-20020989 May 2019
T-piece applications
Flow rate 0.5 to 3 m/s at main pipe wall
By increasing the insertion depth of the tines into the T-piece, the
flow velocity can be increased to 5 m/s for clean fluids. For slurry
applications, the maximum flow velocity should be no greater
than 4 m/s.
Viscosity • For the 2 in (51 mm) (DN50) T-piece, viscosity limit is 100 cP
(200 cP in some cases).
• For the 3 in (76 mm) ( (DN80) T-piece, the viscosity limit is
1000 cP.
Temperature -58 °F (-50.0 °C) to 392 °F (200.0 °C)
Main flow pipe size Minimum diameter, 2 in (51 mm)
Advantages • Simple installation in large bore pipes
• Ideal for clean fluids and non-waxing oils
• 3 in (76 mm) T-Piece installation ideal for high percentage
slurry applications
• Suitable for line density measurement and simple referrals
Recommendations Do not use with:
• Low or unstable flow rates
• Where step changes in viscosity can occur
• For small bore pipes
• Where temperature effects are significant
Flow-through chamber applications
Flow rate
Viscosity • For the 2 in (51 mm) (DN50) Flow Chamber, viscosity limit is
Temperature -58 °F (-50.0 °C) to 392 °F (200.0 °C)
Main flow pipe size Suitable for all sizes, if mounted in a bypass (slipstream)
• 5–40 l/min for 2 in (51 mm) Schedule 40 calibration bore
section (1.5 - 10.5 gal/min)
• 5–300 l/min for 3 in (76 mm) Schedule 80 calibration bore
section (1.5 - 80 gal/min)
100 cP (200 cP in some cases).
• For the 3 in (76 mm) (DN80) Flow Chamber, the viscosity
limit is 1000 cP.
configuration
Installation Manual 13
Planning Installation Manual
May 2019 MMI-20020989
Advantages • 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
Recommendations • Do not use with uncontrolled flow rates.
• Careful system design is required to ensure representative
measurement.
• Frequently requires the use of a pump.
2.6 Perform a pre-installation meter check
Check the meter prior to installation to confirm that no damage occurred to the meter
during shipment.
Procedure
1. Remove the meter from the box.
CAUTION
Handle the meter with care. Follow all corporate and government 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 customer
support at flow.support@emerson.com.
3. Position and secure the meter in a vertical position with the flow arrow pointing
upward.
4. Connect the power wiring, and power up the meter.
Remove the back transmitter housing cover to access the PWR terminals.
14 Micro Motion Fork Density Meter
Installation Manual Planning
MMI-20020989 May 2019
Figure 2-4: Power supply wiring terminals
A. 24 VDC
5. 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.
For more information on performing a KDV check, see the configuration and use
manual that shipped with the product.
Installation Manual 15
Planning Installation Manual
May 2019 MMI-20020989
16 Micro Motion Fork Density Meter
Installation Manual
MMI-20020989 May 2019
Mounting
3 Mounting
If the meter's flow velocity is:
• Below 0.3 to 0.5 m/s, install the meter as a free-stream application.
• Above 0.3 to 0.5 m/s, install the meter as either a T-piece or flow chamber application.
As an alternative, if the pipework can be expanded to reduce the flow velocity to
between 0.3 to 0.5 m/s, install a free stream application.
3.1 Free stream applications
3.1.1 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
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
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 (53 mm) diameter opening in the
pipeline to accept the meter. You must weld the weldolet to the pipeline concentrically
with the pre-bored hole.
Procedure
Use Figure 3-1 to mount a meter in a free-stream flanged fitting installation.
• Insert meter tines directly into the fluid flow.
• For both vertical and horizontal pipes, always install the meter on the side of the pipe.
For a horizontal pipe, never mount the meter on the top of the pipe.
Important
During installation, always position the meter so that the gap between the tines is vertical.
This position helps prevent the trapping of bubbles or solids on the meter – allowing the
solids to sink and the bubbles to rise. You can use the scribe mark on the spigot (located
between the flange and transmitter) as a reference for the tine orientation. Always orient
the meter so the scribe mark is at either the 12 o’clock or 6 o’clock position.
The gap between the fork tines must always be vertical so that:
— Up to 500 cP with long tines
— Up to 20,000 cP with short tines
-40 °F (-40.0 °C) to 392 °F (200 °C) in hazardous areas
Installation Manual 17
Mounting Installation Manual
May 2019 MMI-20020989
• Solids drop down
• Entrained gas will go up
Figure 3-1: Free-stream flanged fitting meter installation
3.1.2
A. Use a 4 in (102 mm) pipe for horizontal installations; a 6 in (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)].
Mount in free-stream application (pipe expanders)
Use the following procedure to mount pipe expanders.
Pipe expanders:
• Increase the diameter of the process pipe to reduce the flow velocity
• Provide a quick response to density changes
• Provide self-cleaning vibrating tines
The following table determines what type of pipe expander to use.
Option
Vertical pipe with a concentric reducer Suitable for all liquids and slurries.
Horizontal pipe with concentric reducer Suitable for clean liquids. Do not use for slurry
Horizontal pipe with eccentric reducer Suitable fo slurry applications.
Best usage
applications, as solids can build up on the
bottom of the pipe.
18 Micro Motion Fork Density Meter
Installation Manual
MMI-20020989 May 2019
Mounting
Procedure
Expand the main process pipe using any of the following options.
Vertical pipe with concentric reducer Figure 3-2
Horizontal pipe with concentric reducer Figure 3-3
Horizontal pipe with eccentric reducer Figure 3-4
Figure 3-2: Option 1: Vertical pipe with a concentric reducer
A. FDM directly inserted into the flow
Figure 3-3: Option 2: Horizontal pipe with concentric reducers
A. Top view of horizontal pipeline
Figure 3-4: Option 3: Horizontal pipe with eccentric reducers
A. Side view of horizontal pipe (meter is on the opposite side)
B. Eccentric expanders/reducers
C. Meter inserted into the flow in an expanded pipe
D. Inside view of pipe and meter
Installation Manual 19
Mounting
May 2019 MMI-20020989
Installation Manual
If you use eccentric reducers, the piping must maintain 20 in (508 mm) of upstream
straight run (both sides for bidirectional flow applications) to avoid jet effect and a
resultant “spray” on the fork tines.
3.1.3 Mount in free-stream application (weldolet fitting)
The weldolet for free-stream installations has a 1.5 in (38 mm) taper lock fitting and is
supplied to be welded on 4 in (102 mm), 6 in (152 mm), 8 in (203 mm), or 10 in (254 mm)
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
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
— Up to 500 cP with long tines
— Up to 20,000 cP with short tines
-40 °F (-40.0 °C) to 392 °F (200 °C) 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 (53 mm) diameter opening in the
pipeline to accept the meter. You must weld the weldolet to the pipeline concentrically
with the pre-bored hole.
Procedure
See Figure 3-5 for information on installing the meter (with a weldolet fitting) in a freestream application.
• Insert meter tines directly into the fluid flow.
• For both vertical and horizontal pipes, always install the meter on the side of the pipe.
For a horizontal pipe, never mount the meter on the top of the pipe.
Important
During installation, always position the meter so that the gap between the tines is vertical.
This position helps prevent the trapping of bubbles or solids on the meter – allowing the
solids to sink and the bubbles to rise. You can use the scribe mark on the spigot (located
between the flange and transmitter) as a reference for the tine orientation. Always orient
the meter so the scribe mark is at either the 12 o’clock or 6 o’clock position.
The gap between the fork tines must always be vertical so that:
• Solids drop down
• Entrained gas will go up
20 Micro Motion Fork Density Meter
Installation Manual
MMI-20020989 May 2019
Figure 3-5: Free-stream (weldolet fitting) meter installation
A. 4 in (102 mm) pipe for horizontal installations; 6 in (152 mm) pipe for vertical
installations
B. 2.1 in (53 mm) meter opening in pipeline
C. Weld
D. Free-stream weldolet (purchased to fit pipe diameter)
Mounting
3.2 T-piece applications
3.2.1 Mount with a 2 in (51 mm) T-piece (flanged fitting)
Prerequisites
• 2 in (51 mm) T-piece (flanged) installations are recommended for processes with the
following conditions:
Flow
Viscosity Up to 100 cP, or 250 cP under some conditions
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
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.
0.5 to 5 m/s (at the pipe wall)
-40 °F (-40.0 °C) to 392 °F (200 °C)
Installation Manual 21
Mounting
May 2019 MMI-20020989
Installation Manual
• Attach the PFA ring and circlip to the underside of the meter flange before installing
the meter in your application (see Attach the PFA ring and circlip).
Note
If you are using a Zirconium meter, this meter uses a self-locking PFA ring and does not
require a circlip.
Procedure
1. See Figure 3-6 for information on installing the meter with a flanged fitting in a 2 in
(51 mm) T-piece.
Figure 3-6: T-piece (flanged fitting) meter installation
A. 2 in (51 mm) 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 (not required for a self-locking PFA ring)
Tip
For hygienic applications, a normal 2 in (51 mm) hygienic tube is too thin for this
application; (it can vibrate in sympathy with the fork, causing measurement errors).
Use a 3 in (76 mm) hygienic tube and fittings instead, or fabricate hygienic fittings
with the same wall thickness and internal diameter as those shown in the diagram
above.
• Insert meter tines directly into the fluid flow.
• For both vertical and horizontal pipes, always install the meter on the side of the
pipe. For a horizontal pipe, never mount the meter on the top of the pipe.
Important
During installation, always position the meter so that the gap between the tines is
vertical. This position helps prevent the trapping of bubbles or solids on the meter –
allowing the solids to sink and the bubbles to rise. You can use the scribe mark on
the spigot (located between the flange and transmitter) as a reference for the tine
orientation. Always orient the meter so the scribe mark is at either the 12 o’clock or
6 o’clock position.
The gap between the fork tines must always be vertical so that:
• Solids drop down
22 Micro Motion Fork Density Meter
Installation Manual Mounting
MMI-20020989 May 2019
• Entrained gas will go up
2. 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.
Figure 3-7: Pipe wall installation
3.2.2
A. Velocity ≤ 10 ft/sec (3 m/s)
B. 10 < velocity ≤ 13 ft/sec (4 m/s)
C. 13 < velocity ≤ 16 ft/sec (5 m/s)
Mount with a 3 in (76 mm) T-piece (flanged fitting)
Mount the FDM in a T-piece pipeline for slurry measurement applications. The T-piece
should be 3 in (76 mm) (DN80) and mounted at an angle to ensure that it will self-drain.
Flow velocity as low as 1.0m/s is acceptable, and preferred velocity is 3m/sec. Care should
be taken at flow velocities of 5m/sec, as there is an increased risk of the T-piece clogging.
Additional cleaning may be required.
Prerequisites
• 3 in (76 mm) T-piece (flanged) installations are recommended for processes with the
following conditions:
Flow
Viscosity Up to 100 cP, or 1000 cP if the insertion distance does not
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
0.5 to 5 m/s (at the pipe wall)
exceed 1 in (25 mm).
-40 °F (-40.0 °C) to 392 °F (200 °C) in hazardous areas
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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 Attach the PFA ring and circlip).
Note
If you are using a Zirconium meter, this meter uses a self-locking PFA ring and does not
require a circlip.
Procedure
See Figure 3-8 or Figure 3-9 for information on installing the meter with a flanged fitting in
a 3 in (76 mm) T-piece.
Figure 3-8: 3 in (76 mm) T-piece installation: horizontal pipe
Insert a purge/drain connection on the upper part of the T-piece. You can use the purge
connection to flush the pipe if necessary.
24 Micro Motion Fork Density Meter
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Figure 3-9: 3 in (76 mm) T-piece installation: vertical pipe
Insert a purge/drain connection on the side of the T-piece. You can use the purge
connection to flush the pipe if necessary.
Mounting
3.2.3
Mount with a T-piece (weldolet fitting)
The weldolet for T-piece installations has a 1.5 in (38 mm) taper lock fitting and is supplied
to be welded on 4 in (102 mm), 6 in (152 mm), 8 in (203 mm) or 10 in (254 mm) pipelines.
A weldolet installation ensures that the tines of the meter are oriented correctly and are
fully inserted into the fluid stream.
Prerequisites
• T-piece (weldolet) installations are recommended for processes with the following
conditions:
Flow 0.5 to 3 m/s (at the pipe wall)
Viscosity Up to 100 cP, or 250 cP under some conditions
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
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 constantly refreshed. This installation will
not respond as rapidly as the free-stream installation to step changes in viscosity.
— If temperature variations are a critical factor in your process, the reduced thermal
mass of the taper-lock fitting of the weldolet renders it more able to track rapid
changes in temperature
• Before fitting the weldolet, you must bore a 2.1 in (53 mm) diameter opening in the
pipeline to accept the meter. You must weld the weldolet to the pipeline concentrically
with the pre-bored hole.
Installation Manual 25
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May 2019 MMI-20020989
Procedure
See Figure 3-5 for information on installing the meter (with a weldolet 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 0.39 in (10 mm) for every 1 m/s increase in the
main flow rate.
Important
During installation, always position the meter so that the gap between the tines is vertical.
This position helps prevent the trapping of bubbles or solids on the meter – allowing the
solids to sink and the bubbles to rise. You can use the scribe mark on the spigot (located
between the flange and transmitter) as a reference for the tine orientation. Always orient
the meter so the scribe mark is at either the 12 o’clock or 6 o’clock position.
The gap between the fork tines must always be vertical so that:
• Solids drop down
• Entrained gas will go up
Installation Manual
Figure 3-10: T-piece (weldolet fitting) meter installation
A. 4 in (102 mm) pipe or larger for horizontal or vertical installations
B. 2.1 in (53 mm) meter opening in pipeline
C. Distance of meter tines from main pipe wall is determined by the maximum flow rate of
the process
D. Weldolet (purchased to fit pipe diameter)
3.3 Mount with a flow-through chamber
Flow-through chambers are manufactured by Micro Motion, and are available with either
of the following:
• Welded ends or compression fittings that connect into the process pipelines
• 1 in (25 mm), 2 in (51 mm), or 3 in (76 mm) inlet and outlet pipes
26 Micro Motion Fork Density Meter
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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 in (51 mm) Schedule 40 calibration bore section (1.5
- 10.5 gal/min)
• 5–300 l/min for 3 in (76 mm) Schedule 80 calibration bore section
(1.5 - 80 gal/min)
Viscosity Up to 1000 cP
Temperature -58 °F (-50.0 °C) to 392 °F (200 °C)
-40 °F (-40.0 °C) to 392 °F (200 °C) in hazardous areas
Pressure 1,015.26 psi (70 bar) @ 399 °F (203.9 °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.
Procedure
See Figure 3-11 for an example installation of a meter in a flow-through chamber.
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May 2019 MMI-20020989
Figure 3-11: Flow-through chamber meter installation
A. Optional temperature port
Note
• This flow-through chamber is a direct-insertion type chamber that does not have a
thermowell, and uses a 0.75 in (19 mm) Swagelok connection.
• The three compression fittings on the flow pockets (0.5 in (13 mm) drain, 0.75 in
(19 mm) temperature probe, and 1.5 in (38 mm) mounting nut for the meter) are
rated to above the working pressure of the flow pocket. The fittings may be Swagelok
or Parker.
3.4 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.
Prerequisites
Verify the following conditions:
Flow
Viscosity • Up to 500 cP (with long tines)
0.3 to 0.5 m/s (at the meter)
Important
If an agitator/stirrer is fitted inside the tank, then the flow
velocity inside the tank could be higher than 0.5m/s if the meter
is mounted close to the side wall. Mounting the meter closer the
center of the tank helps reduce the flow velocity seen by the
meter.
• Up to 20,000 cP (with short tines)
Fluid temperature -40 °F (-40.0 °C) to 302 °F (150 °C)
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Ambient temperature -40 °F (-40.0 °C) to 149 °F (65 °C)
Important
For an open tank installation, consider the ambient temperature
above the tank. Although the meter can operate at 302 °F
(150 °C), with an open tank installation, the maximum ambient
temperature above the tank is limited to 149 °F (65 °C).
Procedure
1. Clamp the long-stem meter to a structure, positioning the clamp to determine the
insertion depth of the meter.
Figure 3-12: Open-tank meter installation (long stem)
2. Confirm the meter tines are away from the tank wall.
Installation Manual 29
B
A
A
B
AA
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Installation Manual
May 2019 MMI-20020989
Figure 3-13: Meter placement (away from tank wall)
A. 2 in (51 mm)
B. 7.87 in (200 mm)
3. Confirm the meter tines are immersed in fluid.
Figure 3-14: Meter placement (immersed in fluid)
4. Confirm the meter tines are placed away from objects and disturbed flow.
Figure 3-15: Meter placement (distance from objects and disturbed flow)
A. 7.87 in (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.
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Figure 3-16: Meter placement (flow direction through tine gap)
6. Confirm the meter tines are kept away from deposit buildup.
Figure 3-17: Meter placement (away from deposit buildup)
3.5 Mount in a closed tank (long-stem meter)
Prerequisites
Verify the following conditions:
Flow
0.3 to 0.5 m/s (at the meter)
Important
If an agitator/stirrer is fitted inside the tank, then the flow
velocity inside the tank could be higher than 0.5m/s if the meter
is mounted close to the side wall. Mounting the meter closer the
center of the tank helps reduce the flow velocity seen by the
meter.
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May 2019 MMI-20020989
Viscosity • Up to 500 cP (with long tines)
• Up to 20,000 cP (with short tines)
Fluid temperature -40 °F (-40.0 °C) to 302 °F (150 °C)
Ambient temperature -40 °F (-40.0 °C) to 149 °F (65 °C)
Important
For an open tank installation, consider the ambient temperature
above the tank. Although the meter can operate at 302 °F
(150 °C), with an open tank installation, the maximum ambient
temperature above the tank is limited to 149 °F (65 °C).
Installation Manual
Procedure
1. Attach the long-stem meter using the fitted flange attachment that's shipped with
the product.
Figure 3-18: Closed-tank installation (fitted flange attachment)
2. To vary the insertion depth of the meter, mount the meter on a standoff section
that attaches to the flange (not provided).
32 Micro Motion Fork Density Meter
B
A
A
B
Installation Manual
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MMI-20020989 May 2019
Figure 3-19: Closed-tank installation (with standoff)
A. Standoff height can vary (provided by customer)
3. Confirm the meter tines are away from the tank wall.
Figure 3-20: Meter placement (away from tank wall)
A. 7.87 in (200 mm)
B. 2 in (51 mm)
4. Confirm the meter tines are immersed in fluid.
Installation Manual 33
A
A
AA
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May 2019 MMI-20020989
Installation Manual
Figure 3-21: Meter placement (immersed in fluid)
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.
Figure 3-22: Meter placement (allowance for tank lid flexing)
A. 7.87 in (200 mm)
6. Confirm the meter tines are placed away from objects and disturbed flow.
Figure 3-23: Meter placement (distance from objects and disturbed flow)
A. 7.87 in (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.
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Figure 3-24: Meter placement (flow direction through tine gap)
8. Confirm the meter tines are kept away from deposit buildup.
Mounting
Figure 3-25: Meter placement (away from deposit buildup)
3.6 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 in (51 mm) Schedule 40 or 80 pipe. The circlip holds
the ring in place.
Procedure
See the figure below for information on attaching the PFA ring and circlip to the meter.
Installation Manual 35
B
A
C
A
Mounting
May 2019 MMI-20020989
A. Circlip
B. PFA ring
C. PFA ring and circlip attached
Installation Manual
3.7 Rotate the electronics on the meter (optional)
You can rotate the transmitter on the meter up to 90°.
Procedure
1. Using a 4 mm hex key, loosen the cap screw that holds the transmitter in place.
Figure 3-26: Component to secure transmitter in place
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 in lbf (7 N m).
36 Micro Motion Fork Density Meter
B
C
D
A
D
E
Installation Manual
MMI-20020989 May 2019
Mounting
3.8 Rotate the display on the transmitter (optional)
The display on the transmitter electronics module can be rotated 90° or 180° from the
original position.
Figure 3-27: Display components
A. Transmitter housing
B. Sub-bezel
C. Display module
D. Display screws
E. Display cover
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.
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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.
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Wiring
4 Wiring
4.1 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 Output (DO) 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
(2.08 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.
Table 4-1: Transmitter outputs
Transmitter version Output channels
A B C
Analog 4–20 mA + HART 4–20 mA Modbus/RS-485
Processor for remote-mount 2700
fieldbus transmitter
Time period signal (TPS) 4–20 mA + HART
Discrete 4–20 mA + HART
Disabled Disabled Modbus/RS-485
(passive)
(passive)
Time Period
Signal (TPS)
Discrete output Modbus/RS-485
Modbus/RS-485
4.2 Explosion-proof/flameproof or non-hazardous output wiring
4.2.1 Wire Analog outputs in 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.
Installation Manual 39
mA1+
HART
RS-485
PWR
mA2
AA
B
RS-485 A
RS-485 B
C
D
B
B
A
A
A
Wiring Installation Manual
May 2019 MMI-20020989
Procedure
Wire to the appropriate output terminal and pins (see the following figure).
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 is allowed.
CAUTION
• To meet the EC Directive for Electromagnetic Compatibility (EMC), use a suitable
instrumentation cable to connect the meter. The instrumentation cable should have
individual screens, foil or braid over each twisted pair, and an overall screen to cover
all cores. Where permissible, connect the overall screen to earth at both ends (360°
bonded at both ends). Connect the inner individual screens at only the controller
end.
• Use metal cable glands where the cables enter the meter amplifier box. Fit unused
cable ports with metal blanking plugs.
40 Micro Motion Fork Density Meter
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4.2.2 Wire Time Period Signal (TPS) or Discrete Output in 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 4-1).
Installation Manual 41
mA1+
HART
RS-485
PWR
TPS/DO
AA
B
RS-485 A
RS-485 B
C
E
D
B
A
A
A
Wiring
Installation Manual
May 2019 MMI-20020989
Figure 4-1: Wiring the TPS or Discrete Output version
A. 24 VDC
B. R
(250 Ω resistance)
load
C. HART-compatible host or controller; and/or signal device
D. R
(500 Ω resistance recommended)
load
E. Signal converter/flow computer or Discrete Input device
Note
• For operating the milliamp output with a 24V supply, a maximum total loop resistance
of 657 Ω is allowed.
• When operating the TPS or Discrete Output with a 24 VDC power supply, a maximum
total loop resistance of 1300 Ω is allowed.
CAUTION
• To meet the EC Directive for Electromagnetic Compatibility (EMC), use a suitable
instrumentation cable to connect the meter. The instrumentation cable should have
individual screens, foil or braid over each twisted pair, and an overall screen to cover
all cores. Where permissible, connect the overall screen to earth at both ends (360°
bonded at both ends). Connect the inner individual screens at only the controller
end.
• Use metal cable glands where the cables enter the meter amplifier box. Fit unused
cable ports with metal blanking plugs.
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4.3 Processor wiring for remote-mount 2700 fieldbus
4.3.1 RS-485 entity parameters for remote-mount 2700 fieldbus
DANGER
• Hazardous voltage can cause severe injury or death. To reduce the risk of hazardous
voltage, shut off power before wiring the meter.
• 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.
Table 4-2: RS-485 output and cable entity parameters
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)
Cable parameters for Group IIB
Maximum external capacitance (Co) 660 nF
Maximum external inductance (Lo) 260 µH
31.1 µH/Ω
Maximum external inductance/resistance ratio
(Lo/Ro)
Installation Manual 43
124.4 µH/Ω
Wiring
May 2019 MMI-20020989
Installation Manual
4.3.2 Connect 4-wire cable
4-wire cable types and usage
Micro Motion offers two types of 4-wire cable: shielded and armored. Both types contain
shield drain wires.
The cable supplied by Micro Motion consists of one pair of red and black 18 AWG
(0.823 mm²) wires for the VDC connection, and one pair of white and green 22 AWG
(0.326 mm²) wires for the RS-485 connection.
User-supplied cable must meet the following requirements:
• Twisted pair construction.
• Applicable hazardous area requirements, if the core processor is installed in a
hazardous area.
• Wire gauge appropriate for the cable length between the core processor and the
transmitter.
• Wire gauge of 22 AWG (0.326 mm²) or larger, with a maximum cable length of 1,000 ft
(305 m).
Prepare a cable with a metal conduit
Prerequisites
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.
Procedure
1. Remove the integral processor cover using a flat-blade screw driver.
2. Run the conduit to the sensor.
3. Pull the cable through the conduit.
4. Cut the drain wires and let them float at both ends of the conduit.
Prepare a cable with user-supplied cable glands
Prerequisites
Important
For user-supplied cable glands, the gland must be capable of terminating the drain wires.
Procedure
1. Remove the core processor cover using a flat-blade screw driver.
2. Pass the wires through the gland.
3. Terminate the shield and drain wires inside the gland.
4. Assemble the gland according to vendor instructions.
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Prepare a cable with Micro Motion-supplied cable glands
Procedure
1. Remove the core processor cover using a flat-blade screw driver.
2. Pass the wires through the gland nut and clamping insert.
A. Gland nut
B. Clamping insert
3. Strip the cable jacket.
Option Description
NPT gland type Strip 4.5 in (114 mm)
M20 gland type Strip 4.25 in (108 mm)
4. Remove the clear wrap and filler material.
5. Strip most of the shielding.
Option
NPT gland type Strip all but 0.75 in (19 mm)
M20 gland type Strip all but 0.5 in (13 mm)
6. Wrap the drain wires twice around the shield and cut off the excess drain wires.
A. Drain wires wrapped around shield
7. For foil (shielded cable) only:
Note
For braided (armored cable) skip this step and contine to the next step.
Option
NPT
gland
type
Description
a. Slide the shielded heat shrink over the drain wires. Ensure that the
wires are completely covered.
b. Apply heat 250 °F (121.1 °C) to shrink the tubing. Do not burn the
cable.
Description
c. Position the clamping insert so the interior end is flush with the braid
of the heat shrink.
Installation Manual 45
Wiring
May 2019 MMI-20020989
Option Description
A. Shielded heat shrink
B. After heat is applied
Installation Manual
M20
gland
type
8. Assemble the gland by folding the shield or braid back over the clamping insert and
0.125 in (3 mm) past the O-ring.
9. Install the gland body into the conduit opening on the core processor housing.
10. Insert the wires through the gland body and tighten the gland nut onto the gland
body.
Trim 0.3 in (8 mm).
A. Trim
A. Shield folded back
A. Shield folded back
B. Gland body
4.3.3
Processor wiring for the remote-mount 2700 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 fieldbus transmitter, see the transmitter installation manual.
46 Micro Motion Fork Density Meter
A
B
C
D
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MMI-20020989 May 2019
Figure 4-2: Processor (Modbus/RS-485) connections to the remote-mount 2700
fieldbus 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 screens, 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 screens 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 47
250 Ω
24 VDC
mA1+
HART
A
B
C
E
D
Wiring Installation Manual
May 2019 MMI-20020989
4.4 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.
4.4.1 Wire mA1 in a HART multi-drop environment
Figure 4-3: Wire mA1 in a HART multi-drop environment
A. HART Device 1
B. HART Device 2
C. HART Device 3
D. Meter (mA+/HART output)
E. HART/Field Communicator
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CAUTION
• To meet the EC Directive for Electromagnetic Compatibility (EMC), use a suitable instrumentation cable
to connect the meter. The instrumentation cable should have individual screens, foil or braid over each
twisted pair, and an overall screen to cover all cores. Where permissible, connect the overall screen to
earth at both ends (360° bonded at both ends). Connect the inner individual screens at only the
controller end.
• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with
metal blanking plugs.
4.5 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.
Installation Manual 49
mA1+
HART
RS-485
PWR
TPS
AA
B
24 VDC
RS-485 A
RS-485 B
A
B
Wiring
May 2019 MMI-20020989
Installation Manual
4.5.1 Wire to a signal converter in an explosion-proof or non-
hazardous area
Use this procedure to wire to a signal converter/flow computer in an explosion-proof/
flameproof or non-hazardous area.
Figure 4-4: 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 Electromagnetic Compatibility (EMC), use a suitable
instrumentation cable to connect the meter. The instrumentation cable should have
individual screens, foil or braid over each twisted pair, and an overall screen to cover
all cores. Where permissible, connect the overall screen to earth at both ends (360°
bonded at both ends). Connect the inner individual screens at only the controller
50 Micro Motion Fork Density Meter
end.
• Use metal cable glands where the cables enter the meter amplifier box. Fit unused
cable ports with metal blanking plugs.
Installation Manual Grounding
MMI-20020989 May 2019
5 Grounding
The meter must be grounded according to the standards that are applicable at the site.
The customer is responsible for knowing and complying with all applicable standards.
Prerequisites
Use the following guides for grounding practices:
• In Europe, IEC 60079-14 is applicable to most installations, in particular Sections
16.2.2.3 and 16.2.2.4.
• In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associated
applications and requirements.
If no external standards are applicable, follow these guidelines to ground the sensor:
• Use copper wire, 14 AWG (2.08 mm²) or larger wire size.
• Keep all ground leads as short as possible, less than 1 Ω impedance.
• Connect ground leads directly to earth, or follow plant standards.
CAUTION
Ground the flowmeter to earth, or follow ground network requirements for the facility.
Improper grounding can cause measurement error.
Procedure
• Check the joints in the pipeline.
• If the joints in the pipeline are ground-bonded, the sensor is automatically
grounded and no further action is necessary (unless required by local code).
• If the joints in the pipeline are not grounded, connect a ground wire to the
grounding screw located on the sensor electronics.
Tip
The sensor electronics may be a transmitter, core processor, or junction box. The
grounding screw may be internal or external.
Installation Manual 51
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52 Micro Motion Fork Density Meter
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MMI-20020989 May 2019
Installation Manual 53
*MMI-20020989*
MMI-20020989
Rev. AE
2019
Micro Motion Inc. USA
Worldwide Headquarters
7070 Winchester Circle
Boulder, Colorado USA 80301
T +1 303-527-5200
T +1 800-522-6277
F +1 303-530-8459
www.emerson.com
Micro Motion Asia
Emerson Automation Solutions
1 Pandan Crescent
Singapore 128461
Republic of Singapore
T +65 6363-7766
F +65 6770-8003
©
2019 Micro Motion, Inc. All rights reserved.
The Emerson logo is a trademark and service mark of Emerson Electric Co. Micro Motion, ELITE,
ProLink, MVD and MVD Direct Connect marks are marks of one of the Emerson Automation
Solutions family of companies. All other marks are property of their respective owners.
Micro Motion Europe
Emerson Automation Solutions
Neonstraat 1
6718 WX Ede
The Netherlands
T +31 (0) 70 413 6666
F +31 (0) 318 495 556
www.micromotion.nl
Micro Motion United Kingdom
Emerson Automation Solutions
Emerson Process Management Limited
Horsfield Way
Bredbury Industrial Estate
Stockport SK6 2SU U.K.
T +44 0870 240 1978
F +44 0800 966 181
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