Omega Products TX83 Installation Manual

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User’s Guide

TX83 and TX84

Two-Wire Current Loop

Powered Indicators

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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, human applications.

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TABLE OF CONTENTS

TX83 AND TX84 TWO-WIRE CURRENT

LOOP INDICATORS

SECTION PAGE

SECTION 1 INTRODUCTION. . . . . . . . . . . . . . . . . . . 1

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

1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

SECTION 2 INSTALLATION 4

2.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.3 Signal Input Connections . . . . . . . . . . . . . . . . . . 11

2.3.1 TX83 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.3.2 TX84 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.4 Power Supply Requirements . . . . . . . . . . . . . . . 13

i

TABLE OF CONTENTS (Cont’d)

SECTION PAGE

SECTION 1 CONFIGURATION PROCEDURES. . . 15

3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 Glossary of Terms . . . . . . . . . . . . . . . . . . . . . . . . 15

3.3 Field Set-Up Calculation Procedure . . . . . . . . . . 17

3.4 Alternate Field Set-Up Calculation Procedure . . . 18

3.5 Field Set-Up Procedure implementation . . . . . . . 20

3.6 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.6.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . 26

3.6.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

SECTION 4 SPECIFICATIONS . . . . . . . . . . . . . . . 29

ii

SECTION 1 INTRODUCTION

1.1 GENERAL DESCRIPTION

The OMEGA

®

TX-83 and TX-84 are weather resistant
digital indicators which accept 1-5 mA, 4-20 mA, or
10-50 mA process input signals. The digital display
(±1999 active counts) can present the process variable
in either percentage or directly in engineering units.
The indicators are powered directly from the current
loop with a volt drop of less than 2.5 volts, and a
power consumption of 2. 5 mW at 1 mA.

The TX-83 and TX-84 are watertight to 5 PSIG, and
have an ambient temperature specification of from

-40 to +85°C making them ideal for locations exposed
to “wash-downs” or to the weather. Applications
include the measurement of temperature, pressure,
flow, PH, or for that matter, the measurement of any
process variable for which a current loop transmitter
is available.

1

For indoor applications OMEGA offers 1/8 DIN size
panel-mount Process Loop Indicators, including the
TX-82A. TX82A Indicators, and others, are described
in the “L” and “M” Section of the OMEGA
Temperature Measurement Handbook.

The TX-83 and TX-84 feature in-field
programmability. Coarse input ranges (1-5, 4-20, or
10-mA) are selected by internal shunts. Three decimal
points and a dummy right-hand zero may also be
selected with pin-forest shunts. Zero and span are
fine-tuned with precision 25-turn potentiometers.
Positive slope response can be changed to negative
slope response (eg., +6000 to -18000) by simply
changing two other internal shunts.

The TX-83 and TX-84 are electrically isolated from the
case, and are immune to most sources of electrical
noise encountered in process-control environments.
In the event of input overrange currents, the TX-83
and TX-84 can tolerate 250 mA in the forward
direction and 1000 mA reverse.

2

Low mass and multi-point circuit board support give
excellent vibration and shock resistance. Sturdy, die­cast construction, polyurethane paint, and full
fluorosilicone gasketing ensure a virtually
waterproof case. Circuit boards are conformally
coated for added humidity protection.

The TX-83 can be mounted in a control room on
either American or European relay tracks with
snaptrack adapters, mounted directly on a wall with
a bulkhead adapter, or mounted in an explosion­proof enclosure for wiring compatibility with other
equipment in hazardous environments. The TX-84
may be connected directly to a conduit with a “T”
junction box. The TX-83 has barrier strip terminals
and the TX-84 has a

1

⁄2" NPT conduit fitting with 12"

lead Wires.

3

1.2 FEATURES

• 3

1

⁄2 Digit Display with Dummy Zero

• Powered Entirely by Signal Loop

• 1 to 5, 4 to 20, or 10 to 50 mA Ranges

• Scalable Zero and Offset for Engineering Units

• High Vibration and Shock Resistant with Cases of

Die-Cast Metal that are Waterproof to 35 kPa (5 psi)

SECTION 2 INSTALLATION

2.1 UNPACKING

Remove the Packing List and verify that all
equipment has been received. If there are any
questions about the shipment, please call OMEGA
Customer Service Department at:

1-800-622-2378 or 203-359-1660.

We can also be reached at:

www.omega.com
email: [e-mail]

4

Upon receipt of shipment, inspect the container and
equipment for any signs of damage. Take particular
note of 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 material and carton in the event
reshipment is necessary.

2.2 MOUNTING

The TX-83 and TX-84 are packaged in a small,
rugged, die-cast, zinc-alloy case designed to fit 3" I.D.
or larger housings, and requiring less than 2" of
height. (Refer to Figure 2-1.)

5

6

Figure 2-1. Outline Dimensions

The TX-83 provides for surface, track, or explosion­proof housing mounting, and is connected with a
three-terminal, #6 screw barrier strip. Tapped holes
on the back of the TX-83 case provide for custom
mounting to a flat surface; integral flanges on the
back of the case provide for standard 8TK2 relay
track mounting. For flat surface mounting, use #6
hardware For 8TK2 relay track mounting, simply
push onto track.

The TX-83 also comes standard with an additional
adapter plate for surface mount with two #8 front­entry screws through keyhole slots, or for push­mount Into TR2/2TK relay track.

The TX84 is equipped with a

1

⁄2" NPT conduit fitting.
The fitting has two, 0.3 meter long, #18 stranded
insulated wires passing through a neoprene moisture
plug, for hook-up to junction boxes with standard
wire nuts. The TX84-2 is the same as the TX84 with a

1

⁄2" male EMT conduit fitting.

Refer to Figures 2-3a and 2-3b for basic mounting
configurations.

7

8

Figure 2-2. Surface and TR2/2TK Relay Track Mounting, Model TX-83

9

Figure 2-3a. Rear View: Standard Integral Mounting Plate (TX-83)

10

Figure 2-3b. Basic Mounting Configurations

2.3 SIGNAL INPUT CONNECTIONS

WARNING

Input currents in excess of protective limits
can damage your TX-83/84 Current Loop
Indicator.

2.3.1 TX-83

Figure 2-4 below shows a typical TX-83 installation
and wiring when used with a two wire transmitter
and power supply. Power supply requirements are
covered in Section 2-4.

11

12

Figure 2-4. TX-83 and Two-Wire Transmitter Wire