Omega Products TX94A Installation Manual

User’s Guide

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TX94A

RTD Ultra-Mini

Temperature Transmitter

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 productsare not designed for usein, and should not be usedfor, 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 the guide contains important information relating to safety and EMC.

TABLE OF CONTENTS

Section 1 Getting Started

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

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

1.3 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.4 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

1.5 Models Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Section 2 Installation

2.1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Section 3 Calibration Instructions

3.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3.2 Set-up of Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3.3 Calibration Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . .7

Section 4 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Section 5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

i

FIGURES & TABLES

Figure 1-1 RTD Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Figure 2-1 Assembly inside a Protection Head . . . . . . . . . . . . . . . . . . . .4

Figure 2-2 Wiring Diagram for RTD Transmitter . . . . . . . . . . . . . . . . . . .5

Figure 3-1 Transmitter Calibration Set-Up . . . . . . . . . . . . . . . . . . . . . . . .7

Figure 5-1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Table 1-1 Range Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Table 1-2 Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Table 3-1 Calibration Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

ii

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 35 Vdc).
Always use a power supply, which complies with EN 60950 safety
standard.

• Do not expose the transmitter to rain or condensing moisture.

• Do not operate the transmitter in flammable or explosive atmosphere.

• As with any electronic instrument, you may encounter high voltage

exposure when installing, calibrating or removing parts of the
transmitter.

EMC Considerations

• Whenever EMC is an issue, always use shielded cables.

• Never run signal and power wires in the same conduit.

• Use signal wire connections with twisted-pair cables.

• 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 Two-Wire RTD Transmitter will produce a standard 4-20mA 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 RTD transmitter accepts two-wire or
three-wire ohm platinum RTD sensors (PT100,alpha = 0.00385).

1