Omega Products TX94 Installation Manual

TX94

RTD 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]
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®

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Engineering Service: 1-800-872-9436/1-800-USA-WHEN

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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
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Frystatska 184, 733 01 Karviná, Czech Republic
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the latest in technology and engineering.OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
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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: 0800 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 United Kingdom
Toll-Free: 0800-488-488
TEL: [phone]
FAX: [phone]
e-mail: [e-mail]

TX94
RTD Two-Wire Temperature Transmitter

Page

Section 1 Introduction 1

1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Models Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Section 2 Unpacking Instructions 9
Section 3 Installation 10

3.1 Mounting the TX94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Wiring the TX94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

TABLE OF

CONTENTS

0i

TX94
RTD Two-Wire Temperature Transmitter

Page

Section 4 Calibration Instructions 18

4.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4.2 Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Section 5 Troubleshooting Guide 23
Section 6 Accessories 25
Section 7 Specifications 26

TABLE OF

CONTENTS

ii

1.1 General Description

The OMEGA®TX94 Two-Wire RTD Transmitter will produce a standard
4-20 mA output signal proportional to that produced by its RTD input
temperature sensor. Transmission of the proportional current output
may be accomplished by using inexpensive copper wire. The TX94 RTD
Transmitter accepts two-wire or three-wire Ohm Platinum RTD sensors
(PT100, alpha = 0.00385).

01

1

Introduction

.

NOTE

Older units only accept two wire RTD’s. See wiring diagram on label on
actual unit.

1 Introduction

Figure 1-1 TX94 Transmitter Figure 1-2 Dimensions (in inches)

2

03

Introduction 1

The TX94 transmitter is normally powered by an unregulated
power supply as shown in Figure 1-3. The proportionally­transmitted 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
available for the TX94 transmitter. To order, refer to Section 1.3
for correct Model Numbers and Range Codes.)

1

4

Introduction

Figure 1-3 TX94 RTD Transmitter

NOTE

Older units
may accept
two wire RTD’s
only.

Introduction 1

05

The TX94 two-wire transmitter works with 2-wire or 3-wire RTDs and
provides an output current of 4-20 mA proportional to the RTD Sensor. When
the transmitter is mounted inside a protection head (such as the OMEGA NB1
Protection Head) two copper wires now carry the temperature signal and dc
voltage to operate the transmitter, thereby reducing possible noise pick-up
errors. The TX94 does NOT provide isolation between its input and the 4-20
mA output. Note, however, that the RTD element is electrically insulated.

6

1.2 Features

• 4-20 mA output

• Ⳳ0.1% full-scale accuracy (with respect to

the RTD input resistance)

• Upscale break protection

• Low Cost

1 Introduction