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Quick Reference Guide

P/N 20001008, Rev. B

August 2005

Model 3700 Transmitter (MVD) or

Model 3350 Peripheral

Installation Instructions for Field-Mount

For technical support, phone the support center nearest you:

In the U.S.A., phone 1-800-522-MASS(1-800-522-6277)

In Canada and Latin America, phone (303) 527-5200

In Asia, phone (65) 6770-8155

In the U.K., phone 0800 - 966 180 (toll-free)

Outside the U.K., phone +31 (0) 318 495 670


This quick reference guide explains basic installation guidelines for installing the Micro Motion® Model 3350/3700 MVD applications platform.

For information on I.S. applications, refer to Micro Motion approval documentation.

For complete instructions about configuration, maintenance, and service, refer to the instruction manual shipped with the transmitter.


Improper installation in a hazardous area can cause an explosion.

For information about hazardous applications, refer to Micro Motion approval documentation, shipped with the transmitter or available from the Micro Motion web site.


Hazardous voltage can cause severe injury or death.

Install transmitter and complete all wiring before supplying power.


Improper installation could cause measurement error or meter failure.

Follow all instructions to ensure transmitter will operate correctly.

©2005, Micro Motion, Inc. All rights reserved. Micro Motion is a registered trademark of Micro Motion, Inc. The Micro Motion and Emerson logos are trademarks of Emerson Electric Co. All other trademarks are property of their respective owners.


European installations

This Micro Motion product complies with all applicable European directives when properly installed in accordance with the instructions in this quick reference guide. 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 web at or through your local Micro Motion support center.

Installation kit

The Model 3350/3700 installation kit includes the parts shown in Figure 1.

Figure 1. Field-mountinstallation kit

Mounting bracket

4 x Lock washer

Transmitter can be oriented on bracket. See Step 3.

4 x Flat washer

4 x M8x16 Bolt assemblies


STEP 1. Choosing a location

Choose a location for the transmitter based on the requirements described below.


Improper installation in a hazardous area could cause an explosion.

Install the transmitter in an area that is compatible with the rating on the approvals tag. See Figure 3.

Environmental requirements

Install the Model 3350/3700 according to specified limits:

Ambient temperature: –4to +140 °F(–20to +60 °C)


See Figures 2, 3, and 4 for Model 3350/3700 dimensions.

Visibility of tags

To ensure personal and system safety, all tags attached to the housing must remain visible. Clean them as often as necessary. Replace tags that are damaged, missing, or worn. See Figure 3 for location of approvals tag.


Figure 2.

Dimensions – face view















4 x 5/16-inch(9 mm) diameter

9 3/16






Mounting bracket can be rotated as needed

Display cover can be

3 5/8

rotated as needed




Figure 3. Dimensions – top view

inches (mm)

5 1/16-inch(129 mm) clearance for removal of circuit boards

Approvals tag

11 5/16


6 1/8


8 11/16


15 1/2



Figure 4. Dimensions – conduit openings view



2 x 2 13/17

1 7/8







2 x 15/16





Case ground



5 x 3/4–14NPT






5 x M20 x 1.5 – 6H



10 3/8


7 1/2


5 3/4


Mounting surface

Cable lengths

Maximum cable length from the sensor to the Model 3700 transmitter depends on the installation type and cable type:

4-wireremote transmitter: see Figure 5, then refer to Table 1 for maximum length of the4-wirecable.

Remote core processor with remote transmitter: see Figure 6, then refer to Table 1 for maximum length of the 4-wirecable and the9-wirecable.

If you are installing the Model 3350 applications peripheral in combination with a transmitter, the maximum cable length from the transmitter’s frequency output to the Model 3350’s frequency input is 500 feet (150 meters).


Figure 5. 4-wireremote transmitter


Model 3700


Core processor (standard or enhanced)

Figure 6. Remote core processor with remote transmitter

Model 3700





Core processor

Junction box

(standard only)

Table 1.

Maximum cable lengths


Cable type


Wire gauge

Maximum length





Micro Motion 9-wire

Not applicable

60 feet (20 meters)





Micro Motion 4-wire

Not applicable

1000 feet (300 meters)











Power wires (VDC)


AWG (0,35 mm2)

300 feet (90 meters)












AWG (0,5 mm2)

500 feet (150 meters)












AWG (0,8 mm2)

1000 feet (300 meters)







Signal wires (RS-485)


AWG (0,35 mm2) or larger

1000 feet (300 meters)





Cable from transmitter’s FO


Not applicable

500 feet (150 meters)

to Model 3350’s FI(1)












(1)Applies only to the Model 3300 applications peripheral when receiving frequency input from a remote Micro Motion transmitter such as an IFT9701 or RFT9739.


STEP 2. Preparing conduit openings for ATEX Zone 1

If the Model 3350/3700 carries an ATEX Zone 1 approval:

1.Remove thread protectors from conduit openings (see Figure 7).

2.Install factory-suppliedcable glands oruser-suppliedEExe cable entry devices in conduit openings that are in use.

3.Install EExe plugs in conduit openings that are not in use.

STEP 3. Orienting the Model 3350/3700 (optional)

The Model 3350/3700 can be oriented on the mounting bracket as needed, and the display cover can be rotated on the applications platform. Figure 7 provides orientation examples.

To orient the Model 3350/3700:

1.Use the four supplied mounting bolt assemblies.

2.Using a 13 mm hex wrench, install the bolt assemblies to 12 ft-lb(16 Nm) of torque.

To rotate the display cover, if needed, see the transmitter installation manual.

Figure 7. Orientation examples

Conduit openings left

Conduit openings for


intrinsically safe

Display cover

sensor wiring


Conduit openings for




input/output wiring


Conduit openings

Conduit openings




STEP 4. Mounting the applications platform

For flat-surfacemounting, see Figure 8.

For pole mounting, see Figure 9.

Figure 8. Mounting to a flat surface

Mount all four bolts to the same surface.

If mounting surface is not flat, use washers to shim the bracket.

Do not secure bolts to separate beams,

girders, wall studs, etc., which can move independently.

4 x5/16-inchor M8 bolt(user-supplied)

Figure 9. Mounting to a pole

4 x 5/16 inch nut (user-supplied)

2 x 5/16-inchU bolt for



STEP 5. Mounting the core processor

This step is required only for remote core processor with remote transmitter installations (see Figure 6). If you have a 4-wireremote installation, go to Step 6.

Figure 10 shows the remote core processor and mounting bracket. Using the mounting bracket, mount the core processor in a location compatible with the cable length requirements discussed in Step 1.

Figure 10. Remote core processor components

Core processor lid

Upper conduit ring

Core processor

Mounting bracket

Lower conduit ring


STEP 6. Connecting input and output wiring

Figure 11 shows the location of the wiring terminals on the Model 3350/3700.

1.Using a flat-headscrewdriver, loosen the four captive screws that secure the display cover to the housing.

2.Connect input/output wiring to the appropriate terminals on the gray terminal block. Refer to Table 2 and to the label attached to the back of the display cover (shown in Figure 12).

Use 22 to 16 AWG (0,35 to 1,5 mm2)twisted-pairshielded wire.

Ground the cable shields at a single point only.

If more than two wires must be connected to a single terminal, use a butt splice or spade lug to connect the wires.