Omega TX94A Manual de usuario

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TX94A

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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

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

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).

1.3 General Description

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

available for the transmitter. To order, refer to Section 1.5 for correct

Model Numbers and Range Codes.)

Figure 1-1 RTD Transmitter

The transmitter works with 2 or 3-wire RTDs and provides an output

current of 4-20mA proportional to the RTD Sensor.

When the transmitter is mounted inside a protection head, (see Figure 2-1),

two copper wires now carry the temperature signal and dc voltage to

operate the transmitter, thereby reducing possible noise pick-up errors.

The transmitter does NOT provide isolation between its input and the

4-20 mA output. Note, however, that the RTD element is electrically

insulated.

1.4 Features

• +/-0.1% full-scale accuracy (with respect to the RTD input

resistance)

• 4-20 mA output

• Upscale break protection

• Low Cost

FIELD CONTROL ROOM

1.5 Models Available

Table 1-1 Range Code

INPUT TYPES

RANGE RTD

-40 to 120 F (-40 to 49 C) 1

0 to 200 F (-18 to 93 C) 2

0 to 300 F (-18 to 149 C) 3

0 to 500 F (-18 to 260 C) 4

0 to 750 F (-18 to 399 C) 5

0 to 1000 F (-18 to 538 C) 6

Table 1-2 Model Numbers

Model Number Description

TX94A-(*) RTD Transmitter (100 ohm, Pt,

alpha=0.00385)

*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 PR-14 Protection Head

SECTION A-A

POWER LINES

RTD 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 RTD element to the (+IN) and (-IN) input terminals.

Figure 2-2 Wiring Diagram for RTD Transmitter

3-WIRE

RTD

RED

BLACK

RED

BLACK

JUMPER

WIRE BLACK

2-WIRE

RTD

3.1 Equipment Required

• Precision Decade Resistance Box, with 0.01 ohm resolution and

±0.02 ohm accuracy

• Precision RTD Simulator, such as OMEGA CL511 Precision Calibrator

• Precision DMM capable of measuring mA, within 0.001 mA resolution

and ±0.002 mA accuracy

3.2 Calibration Procedures

Connect the calibration equipment according to Figure 3-1. Standard

copper test leads are used with RTD instrumentation.

To check or adjust the calibration:

1. Locate the Z (zero) and S (span) potentiometers.

2. Select, from Table 3-1, the correct ohmic values for the Z (zero) and

S (span) adjustments that correspond to the model number.

For example, for Model TX94A-2, the Z value is 92.95 ohms, and the

S value is 135.84 ohms.

If a Thermocouple/RTD Simulator is used, such as the Model CL511

Precision Calibrator, select the Temperature Input Z (zero) and

S (span) values.

3. Set the Decade Box to the selected Z (zero) ohmic value. Adjust the

Z potentiometer to read 4.000 mA on the monitoring instrument.

4. Set the Decade Box to the selected S (span) ohmic value. Adjust the

S potentiometer to read 20.000 mA on the monitoring instrument.

5. Repeat steps 3 and 4, as required, until the readings are exactly

4.000 mA and 20.000 mA. This procedure is necessary since there is

interaction between the two potentiometers.

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