Micro Motion CDM100P, CDM100M Installation Manual

MMI-20020974, Rev AC

Micro Motion® Compact Density Meters

Peak performance precision density meter installation

Installation Manual

May 2015

Safety and approval information

This Micro Motion product complies with all applicable European directives when properly installed in accordance with the
instructions in this manual. Refer to the EC declaration of conformity for directives that apply to this product. The EC declaration of
conformity, with all applicable European directives, and the complete ATEX Installation Drawings and Instructions are available on
the internet at www.micromotion.com or through your local Micro Motion support center.

Information affixed to equipment that complies with the Pressure Equipment Directive can be found on the internet at

www.micromotion.com/documentation.

For hazardous installations in Europe, refer to standard EN 60079-14 if national standards do not apply.

Other information

Full product specifications can be found in the product data sheet. Troubleshooting information can be found in the transmitter
configuration manual. Product data sheets and manuals are available from the Micro Motion web site at

www.micromotion.com/documentation.

Return policy

Micro Motion procedures must be followed when returning equipment. These procedures ensure legal compliance with
government transportation agencies and help provide a safe working environment for Micro Motion employees. Failure to follow
Micro Motion procedures will result in your equipment being refused delivery.

Information on return procedures and forms is available on our web support system at www.micromotion.com, or by phoning the
Micro Motion Customer Service department.

Emerson Flow customer service

Email:

• Worldwide: [e-mail]

• Asia-Pacific: [e-mail]

Telephone:

North and South America Europe and Middle East Asia Pacific

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

Canada [phone] The Netherlands [phone] New Zealand 099 128 804

Mexico [phone] France 0800 917 901 India 800 440 1468

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

Brazil [phone] Italy 8008 77334 China [phone]

Venezuela [phone] Central & Eastern [phone] Japan [phone]

Russia/CIS [phone] South Korea [phone]

Egypt 0800 000 0015 Singapore [phone]

Oman 800 70101 Thailand 001 800 441 6426

Qatar 431 0044 Malaysia 800 814 008

Kuwait 663 299 01

South Africa 800 991 390

Saudi Arabia 800 844 9564

UAE 800 0444 0684

Contents

Contents

Chapter 1 Planning ...........................................................................................................................1

1.1 Installation checklist .......................................................................................................................1

1.2 Best practices .................................................................................................................................2

1.3 Pressure drop in the meter ............................................................................................................. 5

1.4 Power requirements .......................................................................................................................6

1.5 Perform a pre-installation meter check ...........................................................................................9

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

2.1 Mount the meter ..........................................................................................................................11

2.2 Rotate the electronics on the meter (optional) .............................................................................12

2.3 Rotate the display on the transmitter (optional) ...........................................................................13

Chapter 3 Wiring ........................................................................................................................... 15

3.1 Available output terminals and wiring requirements .................................................................... 15

3.2 Explosion-proof/flameproof or non-hazardous output wiring .......................................................16

3.3 Hazardous area output wiring ...................................................................................................... 20

3.4 Processor wiring for remote-mount 2700 FOUNDATION fieldbus™ option ....................................28

3.5 Wiring to external devices (HART multidrop) ................................................................................33

3.6 Wiring to signal converters and/or flow computers ...................................................................... 38

Chapter 4 Grounding ......................................................................................................................41

Installation Manual i

Contents

ii Micro Motion Compact Density Meter

1 Planning

Topics covered in this chapter:

• Installation checklist

• Best practices

• Pressure drop in the meter

• Power requirements

• Perform a pre-installation meter check

1.1 Installation checklist

Make sure that the hazardous area specified on the approval tag is suitable for the

□

environment in which the meter will be installed.

Verify that the local ambient and process temperatures are within the limits of the

□

meter.

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

□

transmitter:

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

to the processor connections.

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

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

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

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

For optimal performance, install the meter in the preferred orientation.

□

Planning

™

The meter will work in any orientation as long as the vibrating tubes remain full of
the process fluid. However, you should validate the meter performance prior to
operation if you have installed it in a non-preferred orientation.

Liquids and slurries

Install the meter so that the flow direction arrow on the meter case matches the

□

actual forward flow of the process. (Flow direction is also software-selectable.)

Installation Manual 1

Preferred meter orientationTable 1-1:

Planning

1.2 Best practices

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

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

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

the meter in your system.

• Install the meter in the preferred orientation in a vertical pipeline with liquids and

slurries flowing upward.

Important

If you do not install the meter in the preferred orientation, you may need to apply a field
offset to ensure optimal performance. Refer to your organizational standards for sampling
and reference measurement to determine what the offset may be.

• Do not apply a compression force greater than 200 lbs (90.7 kg) when installing the

meter.

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

stable temperatures.

• There are no pipe run requirements for Micro Motion meters. Straight runs of pipe

upstream or downstream are unnecessary.

• Keep the meter tubes full of process fluid.

• For halting flow through the meter with a single valve, install the valve downstream

from the meter.

• Minimize bending and torsional stress on the meter. Do not use the meter to align

misaligned piping.

• The meter does not require external supports. The flanges will support the meter in

any orientation.

• Installing the meter in a bypass configuration allows you to remove the meter for

servicing or calibration without affecting the main pipeline
(Recommended installations for bypass configurations).

1.2.1 Recommended installations for bypass configurations

The following figures illustrate typical bypass configurations for installing the meter.

2 Micro Motion Compact Density Meter

Planning

Bypass installation: S-BendFigure 1-1:

Bypass installation: Pressure bendFigure 1-2:

Important

The laminar flow installation is only recommended for processes using refined, clean fluids with low
viscosity.

Installation Manual 3

Bypass installation: Laminar flowFigure 1-3:

A

A

Planning

Bypass installation: Pitot tubeFigure 1-4:

A. Vent

Bypass installation: Orifice plateFigure 1-5:

A. Orifice plate

4 Micro Motion Compact Density Meter

Bypass installation: PumpFigure 1-6:

A

B

C

A. Vent
B. Sample point
C. Pump

Planning

1.3 Pressure drop in the meter

The pressure drop in the meter depends on the process conditions. The following figures
illustrate the pressure drop for the meter at varying fluid density and viscosity. In addition,
these charts show how the meter compares to the Micro Motion 7835/7845 liquid density
meters.

Important

For the most accurate pressure drop calculations using your process variables, use the Micro Motion
product selector available at www.micromotion.com.

Installation Manual 5

0.40

0.30

0.35

0.20

0.25

0.10

0.15

0.05

CDM

0.00

0 2 4 6 8 10 12 14 16

Flow Rate (m3/hr)

Pressure Drop (Bar)

Density = 800 kg/m

3

Viscosity = 2 cP

7835/7845

0.60

0.70

0.40

0.50

0.20

0.30

0.10

CDM100

0.00

0 2 4 6 8 10 12 14 16

Flow Rate (m3/hr)

Pressure Drop (Bar)

Density = 800 kg/m

3

Viscosity = 10 cP

7835/7845

Planning

Sample pressure drop calculations (fluid viscosity equals 2 cP)Figure 1-7:

Sample pressure drop calculations (fluid viscosity equals 10 cP)Figure 1-8:

1.4 Power requirements

Following are the DC power requirements to operate the meter:

6 Micro Motion Compact Density Meter

• Explosion-proof/flameproof meters:

300ft 600ft 900ft 1200ft 1500ft 1800ft 2100ft 2400ft 2700ft 3000ft

Distance of installation

2 1 . 6V
24 V

14

15

16

17

18

19

20

21

22

23

24

25

26

AWG Maximum

91.44m 182.88m 274.32m 365.76m 457.2m 548.64m 640.08m 731.52m 822.96m 914.4m

- 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.

• Intrinsically safe meters:

- 24 VDC, 0.7 W typical with 250 Ω barrier, 0.96 W maximum with 250 Ω barrier

- Minimum recommended voltage: 22.8 VDC with 1000 ft of 22 AWG (300 m of

0.25 mm2) power-supply cable

Power cable recommendations for explosion-proof/flameproof meters

Minimum wire gauge (AWG per feet )Figure 1-9:

Planning

Installation Manual 7

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

Distance of installation

2 1 . 6V
24 V

Minimum Wire Area (mm

2

)

328.084 ft 656.168ft 984.253ft 1312.34ft 1640.42ft 1968.5ft 2296.59ft 2624.67ft 2952.76ft 3280.84ft

300 600 900 1200 1500 1800 2100 2400 2700 3000

Distance of Installation (ft)

22.8V

24V

14

15

16

17

18

19

20

21

22

23

24

25

26

AWG

Minimum Wire Gauge

Planning

Minimum wire area (mm2 per meter)Figure 1-10:

Power cable recommendations for intrinsically safe meters

8 Micro Motion Compact Density Meter

Minimum wire gauge (AWG per feet)Figure 1-11:

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

0.400

0.450

0.500

0.550

0.600

0.650

0.700

0.750

0.800

0.850

0.900

100 200 300 400 500 600 700 800 900 100 0

Minimum Wire Area (mm

2

)

Distance of Installation (m)

Minimum Wire Area (mm2)

22.8V

24V

Planning

Minimum wire area (mm2 per meter)Figure 1-12:

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 Micro Motion

Installation Manual 9

Customer Support at [e-mail].

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.

MTL7728P+

3

4

1

2

A

Planning

Power supply wiring terminalsFigure 1-13:

A. Barrier wiring is applicable to intrinsically safe installations only

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.

10 Micro Motion Compact Density Meter

2 Mounting

Topics covered in this chapter:

• Mount the meter

• Rotate the electronics on the meter (optional)

• Rotate the display on the transmitter (optional)

2.1 Mount the meter

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

Tip

To reduce the risk of condensation or excessive moisture, the transmitter conduit opening should
not point upward (if possible). The conduit opening of the transmitter can be rotated freely to
facilitate wiring.

Mounting

CAUTION!

Do not lift the meter by the electronics. Lifting the meter by the electronics can damage the
device.

Installation Manual 11

Mounting

Mounting the sensorFigure 2-1:

Notes

• Do not use the meter to support the piping.

• The meter does not require external supports. The flanges will support the meter in any orientation.

• All pipework joints and couplings must be airtight to minimize the presence of gas bubbles in the

fluid.

2.2 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.

12 Micro Motion Compact Density Meter

Component to secure transmitter in placeFigure 2-2:

A

A. M5 socket-head cap screw

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

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

Mounting

2.3 Rotate the display on the transmitter
(optional)

The display on the transmitter electronics module can be rotated 90° or 180° from the
original position.

Installation Manual 13

B

C

D

A

D

E

Mounting

Display componentsFigure 2-3:

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.

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.

14 Micro Motion Compact Density Meter

3 Wiring

Topics covered in this chapter:

• Available output terminals and wiring requirements

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

• Hazardous area output wiring

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

• Wiring to external devices (HART multidrop)

• Wiring to signal converters and/or flow computers

3.1 Available output terminals and wiring
requirements

Three pairs of wiring terminals are available for transmitter outputs. These outputs vary
depending on your transmitter output option ordered. The Analog (mA), Time Period
Signal (TPS), and Discrete (DO) outputs require external power, and must be connected to
an independent 24 VDC power supply.

Wiring

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

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

Important

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

hazardous area. It is your responsibility to verify that 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 single­loop wiring or HART multi-drop wiring.

Transmitter outputsTable 3-1:

Output channels

Transmitter version

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

Time period signal (TPS) 4–20 mA + HART Time Period Sig-

A B C

Modbus/RS-485

nal (TPS)

Installation Manual 15

Wiring

Transmitter outputs (continued)Table 3-1:

Output channels

Transmitter version

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

Processor for remote-mount 2700
FOUNDATION fieldbus

™

A B C

Disabled Disabled Modbus/RS-485

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

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

CAUTION!

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

Procedure

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

16 Micro Motion Compact Density Meter

mA1+
HART

RS-485

PWR

mA2

AA
B

RS-485 A

RS-485 B

C

D

B

B

A

A

A

Wiring

Wiring the Analog outputsFigure 3-1:

A. 24 VDC
B. R

(250 Ω resistance)

load

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

Note

Ω

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

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.

Installation Manual 17

Wiring

3.2.2 Wire the Time Period Signal (TPS) or Discrete output
version in an explosion-proof/flameproof or non­hazardous area

CAUTION!

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

Procedure

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

18 Micro Motion Compact Density Meter

mA1+
HART

RS-485

PWR

TPS/DO

AA
B

RS-485 A

RS-485 B

C

E

D

B

A

A

A

Wiring

Wiring the TPS or Discrete output versionFigure 3-2:

A. 24 VDC
B. R

(250 Ω resistance)

load

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

Ω

D. R

load

resistance recommended)

(500

E. Signal converter/flow computer or discrete input device

Note

Ω

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

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.

Installation Manual 19

Wiring

3.3 Hazardous area output wiring

Micro Motion provides safety barrier and galvanic isolator installation kits for wiring the
meter in a hazardous environment. These kits provide the appropriate barriers or isolators
depending on the outputs available and approvals required.

Information provided about wiring the safety barriers and galvanic isolators is intended as
an overview. You should wire the meter according to the standards that are applicable at
your site.

CAUTION!

• Meter installation and wiring should be performed by suitably trained personnel only in

accordance with the applicable code of practice.

• Refer to the hazardous area approvals documentation shipped with your meter. Safety

instructions are available on the Micro Motion Product Documentation DVD and
accessible on the Micro Motion website at www.micromotion.com.

3.3.1 Hazardous area entity parameters

DANGER!

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

DANGER!

Improper wiring in a hazardous environment can cause an explosion. Install the meter only in
an area that complies with the hazardous classification tag on the meter.

Input entity parameters

Input entity parameters: all connectionsTable 3-2:

4–20 mA /Discrete
Output/Time Period

Parameter Power supply

Voltage (Ui) 30 VDC 30 VDC 18 VDC

Current (Ii) 484 mA 484 mA 484 mA

Power (Pi) 2.05 W 2.05 W 2.05 W

Internal capacitance
(Ci)

Internal inductance (Li) 0.0 H 0.0 H 0.0 H

0.0 pF 0.0 pF 0.0011 pF

Signal RS-485

20 Micro Motion Compact Density Meter

Wiring

RS-485 output and cable parameters

All connections to the meter receive their power from the connected intrinsically safe
barrier. All cable parameters are derived from the output parameters of these devices. The
RS-485 connection also receives power from the connected barrier (MTL7761AC),
although this connection has specific output and cable parameters.

RS-485 output and cable entity parameters (MTL7761AC)Table 3-3:

Input parameters

Voltage (Ui) 18 VDC

Current (Ii) 100 mA

Internal capacitance (Ci) 1 nF

Internal inductance (Li) 0.0 H

Output parameters

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

External capacitance (Co) 85 nF

External inductance (Lo) 154 µH

External inductance/resistance ratio (Lo/Ro) 31.1 µH/Ω

Cable parameters for Group IIB

External capacitance (Co) 660 nF

External inductance (Lo) 610 µH

External inductance/resistance ratio (Lo/Ro) 124.4 µH/Ω

Hazardous area
voltage

Hazardous area
current

The meter entity parameters require the selected barrier’s open­circuit voltage to be limited to less than 30 VDC (Vmax = 30 VDC).

The meter entity parameters require the selected barrier’s short­circuit currents to sum to less than 484 mA (Imax = 484 mA) for all
outputs.

Hazardous area
capacitance

The capacitance (Ci) of the meter is 0.0011 μF. This value added to
the wire capacitance (Ccable) must be lower than the maximum
allowable capacitance (Ca) specified by the safety barrier. Use the
following equation to calculate the maximum length of the cable
between the meter and the barrier: Ci + Ccable ≤ Ca

Installation Manual 21

Wiring

Hazardous area
inductance

The inductance (Li) of the meter is 0.0 μH. This value plus the field
wiring inductance (Lcable), must be lower than the maximum
allowable inductance (La) specified by the safety barrier. The
following equation can then be used to calculate the maximum cable
length between the meter and the barrier: Li + Lcable ≤ La

3.3.2 Wire all intrinsically safe using safety barriers

Micro Motion provides a safety barrier installation kit for wiring the meter in a hazardous
area. Contact your local sales representative or Micro Motion Customer Support at

[e-mail] for more information on ordering a barrier kit.

CAUTION!

• Meter installation and wiring should be performed by suitably trained personnel only in

accordance with the applicable code of practice.

• Refer to the hazardous area approvals documentation shipped with your meter. Safety

instructions are available on the Micro Motion Product Documentation DVD and
accessible on the Micro Motion website at www.micromotion.com.

The safety barrier kit provides barriers for connecting all of the available meter outputs.
Use the provided barriers with the designated output.

Output(s) Barrier

4–20 mA MTL7728P+

• 4–20 mA

• Time Period Signal (TPS)

• Discrete

Modbus/RS-485 MTL7761AC

Power MTL7728P+

MTL7728P+

Procedure

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

22 Micro Motion Compact Density Meter

Bus
Bar

Hazardous Area

Non-Hazardous Area

MTL7761AC

RS-485 A

RS-485 B

3

4

1

2

24 VDC

24 VDC

MTL7728P+

24 VDC

3

4

1

2

MTL7728P+

3

4

1

2

250 Ω

MTL7728P+

3

4

1

2

A

B

C

mA1+

HART

RS-485

PWR

mA2/

TPS/DO

A
B

Wiring

Intrinsically safe mA/DO/TPS output wiring using safety barriersFigure 3-3:

A. HART/Field Communicator device
B. Signal device
C. The recommended resistance will vary depending on your Channel B output. For mA outputs, 250 Ω is the recommended

resistance. For TPS or Discrete outputs, 500–1000 Ω is the recommended resistance.

CAUTION!

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal blanking

plugs.

Installation Manual 23

Wiring

3.3.3 Wire the intrinsically safe Analog outputs version using
galvanic isolators

Micro Motion provides a galvanic isolator installation kit specific to wiring the Analog
version of the meter in a hazardous area. Contact your local sales representative or
Micro Motion Customer Support at [e-mail] for more information on
ordering an isolator kit for your meter.

CAUTION!

• Meter installation and wiring should be performed by suitably trained personnel only in

accordance with the applicable code of practice.

• Refer to the hazardous area approvals documentation shipped with your meter. Safety

instructions are available on the Micro Motion Product Documentation DVD and
accessible on the Micro Motion website at www.micromotion.com.

The galvanic isolator kit (Analog version) provides isolators for connecting the following
outputs. Use the provided isolators with the designated output.

Note

The RS-485 barrier is not isolated.

Output(s) Isolator

4–20 mA + HART MTL5541

4–20 mA MTL5541

Modbus/RS-485 MTL7761AC

Power MTL5523

Procedure

Wire the isolators to the appropriate output terminal and pins (see Figure 3-4).

24 Micro Motion Compact Density Meter

mA1+
HART

PWR

mA2

Hazardous Area

Non-Hazardous Area

MTL7761AC

RS-485 A

RS-485 B

3

4

1

2

MTL5541

2

1

14

13

12

11

MTL5523

2

1

24 VDC

14

13

12

11

24 VDC

LINK

250 Ω

MTL5541

2

1

14

13

12

11

24 VDC

250 Ω

A
B

A

B

Wiring

Intrinsically safe output wiring using galvanic isolators (mA outputs option)Figure 3-4:

A. HART/Field Communicator device
B. Signal device

CAUTION!

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal blanking

plugs.

Installation Manual 25

Wiring

3.3.4 Wire the intrinsically safe Time Period Signal (TPS) or
Discrete output version using galvanic isolators

Micro Motion provides a galvanic isolator installation kit specific to wiring the Time Period
Signal (TPS) and Discrete versions of the meter in a hazardous area. Contact your local
sales representative or Micro Motion Customer Support at [e-mail] for
more information on ordering an isolator kit for your meter.

CAUTION!

• Meter installation and wiring should be performed by suitably trained personnel only in

accordance with the applicable code of practice.

• Refer to the hazardous area approvals documentation shipped with your meter. Safety

instructions are available on the Micro Motion Product Documentation DVD and
accessible on the Micro Motion website at www.micromotion.com.

The galvanic isolator kit (TPS/Discrete version) provides isolators for connecting the
following outputs. Use the provided isolators with the designated output.

Note

The RS-485 barrier is not isolated.

Output(s) Isolator

4–20 mA + HART MTL5541

• Time Period Signal (TPS)

• Discrete

Modbus/RS-485 MTL7761AC

Power MTL5523

MTL5532

Procedure

1. Wire the isolators to the appropriate output terminal and pins (see Figure 3-5).

26 Micro Motion Compact Density Meter

mA1+

HART

RS-485

PWR

TPS/DO

SIG

Hazardous Area

Non-Hazardous Area

MTL7761AC

MTL5532

RS-485 A

RS-485 B

5

3

4

1

2

1

11

12

13

14

4

1 kΩ

MTL5541

2

1

14

13

12

11

A

24 VDC

24 VDC

1 kΩ

250 Ω

B

A
B

MTL5523

2

1

14

13

12

11

24 VDC

LINK

Wiring

Hazardous area output wiring using galvanic isolators (TPS and Discrete output options)Figure 3-5:

A. HART/Field Communicator
B. Signal device

CAUTION!

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal blanking

plugs.

Installation Manual 27

1 2 3 4

OFF
ON

Wiring

2. Set the isolator switch settings for the TPS/DO connection (MTL5532 isolator). You

must set the isolator switches appropriately for Pins 1 through 5 (see Table 3-4).

The switches are located on the side of the isolator, and must be set to either Off (the
up position) or On (the down position).

MTL5532 switch location (plus ON/OFF switch position)Figure 3-6:

MTL5532 switch settingsTable 3-4:

Switch ON/OFF?

1 ON

2 OFF

3 OFF

4 OFF

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

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

DANGER!

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

28 Micro Motion Compact Density Meter

Wiring

DANGER!

Improper wiring in a hazardous environment can cause an explosion. Install the meter only in
an area that complies with the hazardous classification tag on the meter.

RS-485 output and cable entity parametersTable 3-5:

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

Maximum external inductance/resistance ratio
(Lo/Ro)

3.4.2 Prepare the 4-wire cable

Important

For user-supplied cable glands, the gland must be capable of terminating the drain wires.

Note

If you are installing unshielded cable in continuous metallic conduit with 360º termination shielding,
you only need to prepare the cable – you do not need to perform the shielding procedure.

31.1 µH/Ω

124.4 µH/Ω

Installation Manual 29

Wiring

4-wire cable preparationFigure 3-7:

Cable glands

Micro Motion

cable gland

Pass the wires through the gland nut and clamping insert.

Gland nut

Clamping
insert

NPT

Gland supplier

Gland type

Remove the integral processor

cover

Cable layout

M20

User-supplied

cable gland

Pass the wires

through the gland.

Terminate the drain

wires inside the

gland.

Metal conduit

Run conduit to

sensor

Lay cable in conduit

Done

(do not perform the

shielding procedure)

1. Strip 4-1/2 inch (115 mm) of cable jacket.

2. Remove the clear wrap and filler material.

3. Strip all but 3/4 inch (19 mm) of shielding.

Wrap the drain wires twice around the shield and cut off

the excess drain wires.

Go to the shielding

1. Strip 4-1/4 inch (108 mm) of cable jacket.

2. Remove the clear wrap and filler material.

3. Strip all but 1/2 inch (12 mm) of shielding.

Drain wires
wrapped around
shield

procedure

30 Micro Motion Compact Density Meter

Wiring

4-wire cable shieldingFigure 3-8:

From the preparation

procedure

Micro Motion

cable gland

Braided

(armored cable)

Apply the Heat Shrink

1. Slide the shielded heat shrink over the drain wires. Ensure that the
wires are completely covered.

2. Apply heat (250 °F or 120 °C) to shrink the tubing. Do not burn the
cable.

3. Position the clamping insert so the interior end is flush with the braid
of the heat shrink.

Assemble the Gland

1. Fold the shield or braid back over the clamping insert and 1/8 inch
(3 mm) past the O-ring.

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

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

Cable shield

type

Shielded heat
shrink

Foil

(shielded cable)

NPT

Gland supplier

Gland type M20

After heat applied

User-supplied

cable gland

Trim 7 mm from the shielded

heat shrink

Trim

Terminate the shield

and drain wires in the

Assemble the gland

according to vendor

gland

instructions

Shield folded back

4-wire cable types and usage

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

The 4-wire cable supplied by Micro Motion consists of one pair of red and black 18 AWG
(0.75 mm2) wires for the VDC connection, and one pair of white and green 22 AWG
(0.35 mm2) wires for the RS-485 connection.

User-supplied 4-wire cable must meet the following requirements:

Installation Manual 31

Gland body

Done

A

B
C

D

Wiring

• Twisted pair construction.

• Applicable hazardous area requirements, if the core processor is installed in a

hazardous area.

• Wire gauge appropriate for the cable length between the core processor and the

transmitter.

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

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

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

Figure 3-9:

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

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

Important

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

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

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

ports should be fitted with metal blanking plugs.

32 Micro Motion Compact Density Meter

3.5 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.

3.5.1 Wire mA1 in a HART multi-drop environment

Important

To wire power and outputs, see Wire power and outputs in a HART single-loop environment.

Wiring

Installation Manual 33

250 Ω

24 VDC

mA1+

HART

A

B

C

E

D

Wiring

Wire mA1 in a HART multi-drop environmentFigure 3-10:

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

CAUTION!

• To meet the EC Directive for 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.

3.5.2 Wire external HART devices in an intrinsically safe area

You can wire up to three external HART devices in an intrinsically safe environment.
Following are diagrams showing a HART multidrop connection using a single barrier
connection (see Figure 3-11) and multiple barrier connections (see Figure 3-12).

34 Micro Motion Compact Density Meter

Wiring

When connecting to a single barrier, do the following to determine your cable parameters
(for each device):

• Sum the Ci and Li parameters for each device connected.

• Subtract the sum from the Co and Lo for the barrier.

• Configure all devices to be operating at a fixed 4 mA output.

Installation Manual 35

mA1+

HART

Hazardous Area

Non-Hazardous Area

24 VDC

3

Bus

Bar

4

1

2

A

B

C

E

D

MTL7728P+

Wiring

Wiring external devices in an intrinsically safe area (single barrier)Figure 3-11:

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

CAUTION!

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal

blanking plugs.

36 Micro Motion Compact Density Meter

Hazardous Area

Non-Hazardous Area

24 VDC

MTL7728P+

Barrier 3

Barrier 1

Barrier 2

3

4

1

2

A

B

C

E

Bus
Bar

mA1+

HART

D

Wiring

Wiring external devices in an intrinsically safe area (multiple barriers)Figure 3-12:

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

CAUTION!

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable ports with metal

blanking plugs.

Installation Manual 37

Wiring

3.6 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.

38 Micro Motion Compact Density Meter

3.6.1 Wire to a signal converter/flow computer in an

mA1+
HART

RS-485

PWR

TPS

AA
B

24 VDC

RS-485 A

RS-485 B

A

B

explosion-proof/flameproof or non-hazardous area

Wiring

Figure 3-13:

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 end.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable

ports with metal blanking plugs.

Installation Manual 39

mA1+

HART

RS-485

PWR

TPS

AA

B

Hazardous Area

Non-Hazardous Area

MTL7761AC

RS-485 A

RS-485 B

3

4

1

2

24 VDC

MTL7728P+

3

4

1

2

MTL7728P+

3

4

1

2

MTL7728P+

3

4

1

2

A

B

Wiring

3.6.2 Wire to a signal converter/flow computer in an
intrinsically safe area

Wiring to a signal converter/flow computer in an intrinsically safe areaFigure 3-14:

B. Active signal converter/flow computer

CAUTION!

A. Active HART host

• In an electrically noisy environment, screen the cable in a safe area.

• 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.

• For safety, do not terminate the inner individual screens to earth in a hazardous area.

• Use metal cable glands where the cables enter the meter amplifier box. Fit unused cable

ports with metal blanking plugs.

40 Micro Motion Compact Density Meter

4 Grounding

The meter must be grounded according to the standards that are applicable at the site.
The customer is responsible for knowing and complying with all applicable standards.

Prerequisites

Micro Motion suggests the following guides for grounding practices:

• In Europe, EN 60079-14 is applicable to most installations, in particular Sections

12.2.2.3 and 12.2.2.4.

• In the U.S.A. and Canada, ISA 12.06.01 Part 1 provides examples with associated

applications and requirements.

• For IECEx installations, IEC 60079-14 is applicable.

If no external standards are applicable, follow these guidelines to ground the meter:

• Use copper wire, 18 AWG (0.75 mm2) or larger wire size.

• Keep all ground leads as short as possible, less than 1 Ω impedance.

• Connect ground leads directly to earth, or follow plant standards.

Grounding

CAUTION!

Ground the meter to earth, or follow ground network requirements for the facility. Improper
grounding can cause measurement error.

Procedure

Check the joints in the pipeline.

- 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.

Installation Manual 41

Micro Motion Inc. USA

Worldwide Headquarters
7070 Winchester Circle
Boulder, Colorado 80301
T [phone]
T [phone]
F [phone]

www.micromotion.com

Micro Motion Europe

Emerson Process Management
Neonstraat 1
6718 WX Ede
The Netherlands
T [phone]
F [phone]

www.micromotion.nl

*MMI-20020974*

MMI-20020974

Rev AC

2015

Micro Motion Asia

Emerson Process Management
1 Pandan Crescent
Singapore 128461
Republic of Singapore
T [phone]
F [phone]

Micro Motion United Kingdom

Emerson Process Management Limited
Horsfield Way
Bredbury Industrial Estate
Stockport SK6 2SU U.K.
T [phone]
F [phone]

Micro Motion Japan

Emerson Process Management
1-2-5, Higashi Shinagawa
Shinagawa-ku
Tokyo 140-0002 Japan
T [phone]
F [phone]

©

2015 Micro Motion, Inc. All rights reserved.

The Emerson logo is a trademark and service mark of Emerson
Electric Co. Micro Motion, ELITE, ProLink, MVD and MVD Direct
Connect marks are marks of one of the Emerson Process
Management family of companies. All other marks are property of
their respective owners.