Omega TX93A Manual de usuario

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TX93A

(J, K, T, E) 4-20 mA

Ultra-Miniature

Temperature Transmitters

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omega.com

User’s Guide

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.

omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc.

Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only)

Engineering Service: 1-800-872-9436 (USA & Canada only)

Tel: (203) 359-1660 Fax: (203) 359-7700

e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

TABLE OF CONTENTS

Section 1 Getting Started

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

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

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

1.4 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.5 Models Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Section 2 Installation

2.1 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Section 3 Calibration Instructions

3.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3.2 Set-up of Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3.3 Calibration Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . .8

Section 4 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Section 5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

FIGURES & TABLES

Figure 1-1 Thermocouple Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Figure 1-2 Straight Line Approximation of a Curve . . . . . . . . . . . . . . . . .3

Figure 2-1 Assembly inside an NB2 Protection Head . . . . . . . . . . . . . . .5

Figure 2-2 Wiring Diagram for Thermocouple Transmitter . . . . . . . . . . .6

Figure 3-1 Transmitter Calibration Set-Up . . . . . . . . . . . . . . . . . . . . . . . .9

Figure 3-2 Transmitter Calibration Set- Up (Alternate) . . . . . . . . . . . . . .9

Figure 5-1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Table 1-1 Range Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Table 1-2 Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Table 3-1 Calibration Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

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 Thermocouple Two-Wire Temperature Transmitter accepts

thermocouple sensor types J, K, T, or E and will produce a standard 4-

20mA 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.

1.3 General Description (continued)

The transmitter is normally powered by an unregulated power supply as

shown in Figure 1-1. The proportionally-transmitted signal begins at 4mA,

at the low end of its temperature range, and increases to 20mA, at the

high end of its temperature range. (There are various temperature ranges/

thermocouple types available for the transmitter. To order, refer to Section

1.5 for correct Model Numbers and Range Codes.)

Figure 1-1 Thermocouple Transmitter

The two-wire transmitter receives and measures signals from

themocouples and sends an output current of 4-20mA 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 transmitter is mounted inside a protection head, (see Figure 2-1), the

thermocouple extension wires are replaced by two copper wires that carry

the 4-20mA signal and dc voltage to operate the transmitter.

The transmitter has reverse supply polarity protection and will operate with

a wide range of supply voltages (8 to 35 Vdc). It has an input sensor break

protection circuit that forces the output current to go upscale when the

thermocouple wire opens.

The transmitter 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.

1.3 General Description (continued)

Most thermocouple transmitters with 4-20 mA outputs, including this

transmitter , 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.

This leads to maximum error at approximately the midpoint of the

range as shown in Figure 1-2.

Figure 1-2 Straight Line Approximation of a Curve

1.4 Features

• 4-20 mA output

• +/-0.1% full-scale accuracy (with respect to the mV input signal)

• Upscale break protection

• Low Cost

RANGE

T/C CURVE

LINEARITY

ERROR

STRAIGHT LINE

INCREASING TEMPERATURE

INCREASING MILLIVOLTS

1.5 Models Available

Table 1-1 Range Code

INPUT TYPES

RANGE J K T E

-40 to 120 F (-40 to 49 C) J1 - - E1

0 to 200 F (-18 to 93 C) J2 K2 T2 E2

0 to 300 F (-18 to 149 C) J3 K3 T3 E3

0 to 500 F (-18 to 260 C) J4 K4 T4 E4

0 to 750 F (-18 to 399 C) J5 K5 T5 E5

0 to 1000 F (-18 to 538 C) J6 K6 - E6

Table 1-2 Model Numbers

Model Number Description

TX93A-(*) Thermocouple Transmitter (J, K, T, or E)

NB2TX93A-(*) NB2 thermocouple probe, 12"L, 1/4” O.D.,

ungrounded junction, 304SS sheath

*Insert range code from Table 1-1

2.1 Mounting

The transmitter may be:

1. surface mounted

2. mounted inside a protection head (shown in Figure 2-1)

Figure 2-1 Assembly of the Transmitter

inside an NB2 Protection Head

SECTION A-A

POWER LINES

T/C WIRES

2.2 Wiring

Refer to Figure 2-2

1. Connect a dc power supply in series with the load to the (+PS) and

(-PS) power terminals. Note that the load (usually a monitoring

instrument) may be connected to either the (+) or (-) power lead.

2. Connect the thermocouple to the (+IN) and (-IN) input terminals.

Figure 2-2 Wiring Diagram for Thermocouple Transmitter

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