Omega Products TX93 Installation Manual

TX93

Thermocouple Two-Wire
Temperature Transmitter

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Servicing

North America:

U.S.A.:

ISO 9001 Certified

OMEGA Engineering, Inc., One Omega Drive,
P.O. Box 4047, Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Canada:

976 Bergar
Laval (Quebec), Canada H7L 5A1
Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

For immediate technical or

application assistance:

U.S.A. 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:

En Español: 001 [phone]
FAX: [phone]
e-mail: [e-mail]

[e-mail]

OMEGAnet®On-Line Service Internet e-mail

omega.com [e-mail]

It is the policy of OMEGA Engineering, Inc. 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 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, human applications.

Benelux:

Managed by the United Kingdom Office
Toll-Free: 0800 099 3344 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Czech Republic:

Frystatska 184, 733 01 Karviná, Czech Republic
Toll-Free: 0800-1-66342 TEL: [phone]
FAX: [phone]
e-mail: [e-mail]

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers
the latest in technology and engineering.OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2008 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced,
translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of
OMEGA ENGINEERING, INC.

RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY
PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER
SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the
outside of the return package and on any correspondence. The purchaser is responsible for shipping charges, freight, insurance
and proper packaging to prevent breakage in transit.

Servicing Europe:

FOR WARRANTY RETURNS, please have the following
information available BEFORE contacting OMEGA:

1.Purchase Order number under which the product was

PURCHASED,

2. Model and serial number of the product under warranty, and

3.Repair instructions and/or specific problems relative to the

product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3.Repair instructions and/or specific problems relative to the

product.

France:

Managed by the United Kingdom Office
Toll-Free: 0800 466 342 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

Germany/Austria:

Daimlerstrasse 26
D-75392 Deckenpfronn, Germany
Toll-Free: 0 800 6397678 TEL: [phone]
FAX: [phone] e-mail: [e-mail]

United Kingdom: ISO 9001 Certified

OMEGA Engineering Ltd.
One Omega Drive, River Bend Technology
Centre, Northbank, Irlam, Manchester
M44 5BD England
Toll-Free: 0800-488-488
TEL: [phone]
FAX: [phone]
e-mail: [e-mail]

Remove the Packing List and verify that you have received all equipment, including:

• TX93 Termocouple Two-Wire Temperature Transmitter

• Operator’s Manual

If you have any questions about the shipment, please call the Customer Service
Department.

When you receive the shipment, inspect the container and equipment for 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 damage claims unless all shipping material
is saved for inspection. After examining and removing contents, save
packing material and carton in the event reshipment is necessary.

i

Unpacking Instructions

TX93

Thermocouple Two-Wire Temperature Transmitter

Section Page
Section 1 Introduction

11

Section 2 Installation 11

2.1 Mounting the TX93 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2 Wiring the TX93. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Section 3 Calibration Instructions 19

3.1 Equipment Required. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.2 Set-up of Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3.3 Calibration Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

TABLE OF

CONTENTS

ii

TX93
Thermocouple Two-Wire Temperature Transmitter

Section Page
Section 4 Troubleshooting Guide 27

Section 5 Accessories 30
Section 6 Specifications 31

TABLE OF

CONTENTS

iii

1.1 General Description

The OMEGA®TX93 Thermocouple Two-Wire Temperature Transmitter
accepts thermocouple sensor types J, K, T, or E and will produce a standard
4-20 mA output signal proportional to that produced by its attached input
temperature sensor. Transmission of the proportional current output may be
accomplished by using inexpensive copper wire.

01

1

Introduction

Introduction

Figure 1-1 TX93 Transmitter Figure 1-2 Dimensions (in inches)

2

1

1

3

Introduction

The TX93 transmitter is normally powered by an unregulated power
supply as shown in Figure 1-3. The proportionally-transmitted signal begins
at 4 mA, at the low end of its temperature range, and increases to 20 mA,
at the high end of its temperature range. (There are various temperature
ranges thermocouple types available for the TX93. To order, refer to
Section 1.3 for correct Model Numbers and Range Codes.)

Figure 1-3 TX93 Thermocouple Transmitter

Introduction

4

1

1

5

Introduction

The TX93 two-wire transmitter receives and measures signals from thermo­couples and sends an output current of 4-20 mA which is directly proportional
to the thermocouple millivolt input. It is designed to connect with only two cop­per wire leads that will supply the voltage to operate the transmitter from a
power supply, and also carry the output current. The output current is used for
recording, computing, or controlling.

If the TX93 is mounted inside a protection head, (see Figure 3-1), the thermo­couple extension wires are replaced by two copper wires that carry the 4-20 mA
signal and dc voltage to operate the transmitter.

Introduction

6

1

The TX93 has reverse supply polarity protection and will operate with a wide
range of supply voltages (7 to 35 Vdc). It has an input sensor break-protection
circuit that forces the output current to go upscale when the thermocouple wire
opens. It also is provided with a screw terminal, where the output current can be
measured without interrupting the power loop. The TX93 does NOT provide
isolation between its input and the 4-20 mA output; therefore, an ungrounded
thermocouple junction is suggested to prevent possible ground loops. Note that
most thermocouple transmitters with 4-20 mA outputs, including the TX93, are
proportional with respect to the thermocouple input voltage. However, the rela­tionship between temperature and millivolt for all the thermocouple types is
somewhat non-linear.

1

7

Introduction

This leads to maximum error at approximately the midpoint of the range as
shown in Figure 1-4.

Figure 1-4 Straight Line Approximation of a Curve

Introduction

8

1

1.2 Features

• 4-20 mA output

• Ⳳ0.1% full-scale accuracy (with respect to the mV input signal)

• Upscale break protection

• Low Cost