Omega Products TX92A Installation Manual

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User ’s Guide

TX92A (RTD)

4-20 mA

Mini Temperature Transmitter

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply.
OMEGA is constantly pursuing certification of its products to the European New Approach Directives.
OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no liability for
any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected applications.

This device is marked with the international caution symbol. It is important to read the Setup Guide before
installing or commissioning this device as it contains important information relating to safety and EMC.

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OMEGAnet® On-Line Service

www.omega.com

Internet e-mail

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Servicing North America:

USA: One Omega Drive, P.O. Box 4047

ISO 9001 Certified Stamford CT 06907-0047

TEL: [phone] FAX: [phone]
e-mail: [e-mail]

Canada: 976 Bergar
Laval (Quebec) H7L 5A1
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

For immediate technical or application assistance:

USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA
Customer Service: 1-800-622-2378 / 1-800-622-BEST
Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN

Mexico and TEL: (001)800-TC-OMEGA® FAX: [phone]
Latin American: En Espa

e-mail: [e-mail]

ñol: [phone]-7803

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Servicing Europe:

Benelux: Postbus 8034, 1180 LA Amstelveen, The Netherlands
TEL: [phone] FAX: [phone]
Toll Free in Benelux: 0800 0993344
e-mail: [e-mail]

Czech Republic: Frystatska 184, 733 01 Karviná
TEL: [phone] FAX: [phone]
e-mail: [e-mail]

France: 11, rue Jacques Cartier, 78280 Guyancourt
TEL: [phone] FAX: [phone]
Toll Free in France: 0800 466 342

Germany/Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany
TEL: [phone] FAX: [phone]
Toll Free in Germany: 0800 639 7678
e-mail: [e-mail]

United Kingdom: One Omega Drive

ISO 9002 Certified River Bend Technology Centre

Northbank, Irlam Manchester M44 5BD United Kingdom
TEL: [phone] FAX: [phone]
Toll Free in England: 0800 488 488
e-mail: [e-mail]

e-mail: [e-mail]

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TTAABBLLEE OOFF CCOONNTTEENNTTSS PPAAGGEE

1.0 GETTING STARTED

1.1 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Safety and EMC Considerations . . . . . . . . . . . . . . . . . . . . 1

1.3 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.4 Available Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.5 Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.6 Shock Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.0 CONNECTING POWER AND SIGNAL INPUTS. . . . . . . . . 4

3.0 CALIBRATING THE TRANSMITTER. . . . . . . . . . . . . . . . . 5

4.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

LIST OF FIGURES AND TABLES

Figure 2-1 Power Input Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2-2 Pin Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3-1 Calibration Setup (Resistance Source). . . . . . . . . . . . . . . . 5

Figure 3-2 Calibration Setup (RTD Simulator) . . . . . . . . . . . . . . . . . . . 6

Figure 4-1 Case Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 4-2 Transmitter Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 1-1 Range/Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Table 2-1 Screw-Terminal Pin Assignment . . . . . . . . . . . . . . . . . . . . 4

Table 3-1 Fahrenheit Temperature to OHMs Conversion Chart . . . . . 6

Table 3-2 Celsius Temperature to OHMs Conversion Chart. . . . . . . . 6

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SECTION 1 GETTING STARTED

1.1 Unpacking

Remove the packing list and verify that you have received all equipment.
If you have any questions, contact the nearest Customer Service Department, as
listed on the cover of this manual.

Upon receipt of shipment, inspect the container and equipment for any signs of
damage. Note any evidence of rough handling in transit. Immediately report any
damage to the shipping agent.

Note: The carrier will not honor any claims unless all shipping material is saved for
their examination. After examining and removing contents, save packing materials
and carton in the event reshipment is necessary.

1.2 Safety and EMC Considerations

This instrument is a Class III device (8 to 50 Vdc).
Always use a power supply, which complies with EN 60950 safety standard.

EMC Considerations

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Whenever EMC is an issue, always use shielded cables.

••

Never run signal and power wires in the same conduit.

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Use signal wire connections with twisted-pair cables.

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Install Ferrite Bead(s) on signal wires close to the instrument if EMC problems
persist.

Failure to follow all instructions and warnings may result in injury!

1.3 General Description

The TX92A Series transmitter accepts platinum 100 ohm sensor type RTDs and will
produce a standard 4-20 mA output signal proportional to that produced by its
attached RTD input. The transmitter does NOT provide isolation between its input and
the 4-20 mA output; therefore, an ungrounded RTD is suggested to prevent possible
ground loops.

The transmitter provides amplification, common-mode rejection and controlling the
current draw from an 8-to-50 Vdc source to produce the 4-to-20 mA output signal.
As much as 800 ohms dropping resistance may be used in the power leads of the
TX92A when the unit is energized from a 24 Vdc source because of the small
compliance voltage needed by the unit.

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