Omega TX90A Series Bedienungsanleitung

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TX91A

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

Mini Temperature Transmitter

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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

TTAABBLLEEOOFFCCOONNTTEENNTTSSPPAAGGEE

1.0 GETTING STARTED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

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

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

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

1.4 Available Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.5 Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.6 Shock Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.0 CONNECTING POWER AND SIGNAL INPUTS. . . . . . . . . 4

3.0 CALIBRATING THE TRANSMITTER. . . . . . . . . . . . . . . . . 6

4.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

LIST OF FIGURES AND TABLES

Figure 2-1 Power Input Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 2-2 Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3-1 Calibration Setup using a Millivolt Source . . . . . . . . . . . . . 6

Figure 3-2 Calibration using a Thermocouple Simulator . . . . . . . . . . . 7

Figure 4-1 Case Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 4-2 Transmitter Block Diagram . . . . . . . . . . . . . . . . . . . . . . . 11

Table 1-1 Range/Models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Table 2-1 Screw-Terminal Pin Assignment . . . . . . . . . . . . . . . . . . . . 5

Table 3-1 Fahrenheit Temperature to Millivolt Conversion Chart . . . . 8

Table 3-2 Celsius Temperature to Millivolt Conversion Chart . . . . . . . 9

SECTION 1 GETTING STARTED

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 50 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 TX91A Series transmitter accepts thermocouple sensor types J, K, T, and E and

will produce a standard 4-20 mA output signal proportional to that produced by its

attached thermocouple millivolt input. 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.

The transmitter provides cold reference junction compensation for the thermocouple

types as well as amplification, common-mode rejection and controlling the current

drawn from an 8-to-50 Vdc source to produce the 4-to-20 mA output signal. As

much as 800 ohms dropping resistance may be used in the power leads of the

TX91A when the unit is energized from a 24 Vdc source because of the small

compliance voltage needed by the unit.

1.4 Available Ranges

As specified in Table 1-1, the transmitter has 10 ranges. Depending upon the range,

the transmitter can measure temperature span as narrow as 160°F or as wide as

1000°F. A multi-turn, top-accessible potentiometer provides fine span tuning. A

second top-accessible, multi-turn potentiometer provides a zero adjustment which

allows placement of the 4-mA output temperature within +/- 25% for Fahrenheit and

+/- 10% for Celsius of nominal span (refer to Section 3.0, Calibrating the Transmitter,

for more details).

Table 1-1. Range/Models

RRaannggeeMMooddeell

0 to 200°FJ2K2T2E2

0 to 300°FJ3K3T3E3

0 to 500°FJ4K4T4E4

0 to 750°FJ5K5T5E5

0 to 1000°F J6 K6 N/A E6

-0 to 100°CJ7K7T7E7

-0 to 150°CJ8K8T8E8

-0 to 250°CJ9K9T9E9

-0 to 400°C J10 K10 T10 E10

-0 to 500°C J11 K11 N/A E11

1.5 Ordering Guide

The model number describes the functionality of the transmitter.

MMooddeellTTeemmppeerraattuurreeRRaannggee

* 0 to 1000°F ( 0 to 500°C) is not available for type T thermocouple.

**Factory Scaling available for additional charge. Consult factory.

To order additional transmitters, write TX91A followed by the model letter and number.

For example:

TX91A-J3 = Transmitter with thermocouple type J and a temperature range of -0 to 300°F.

TX91A-E9 = Transmitter with thermocouple type E and a temperature range of -0 to 250°C.

2 -0 to 200°F

3 -0 to 300°F

4 -0 to 500°F

5 -0 to 750°F

6 -0 to 1000°F

7 -0 to 100°C

8 -0 to 150°C

9 -0 to 250°C

10 -0 to 400°C

11 -0 to 500°C

OPTION:

FS** Factory Scaling

TX91A-

1.6 Shock Resistance

Lightweight TX91A transmitter circuit boards are fabricated from rigid, shock resistant

materials with the components soldered to the circuit board.

The TX91A transmitter's small size permits mounting into thermowells or wall mount-

ing in confined areas.

SECTION 2 CONNECTING POWER AND SIGNAL INPUTS

••Verify that the transmitter is connected for the correct power voltage rating.

••The transmitter has no power on switch, so it will be in operation as soon as you

apply power.

Figure 2-1 Power Input Setup

+PS and -PS screws accept 2mm (13 gauge) or lighter wire. Input range is 8-50 Vdc.

DC SUPPLY

8--50 VDC

4--20mA

+IN

-IN

+PS

R LOAD

TH RMOCOUPL

TRANSMITT R

SECTION 2 CONNECTING POWER AND SIGNAL INPUTS (continued)

Table 2-1. Screw-Terminal Pin Assignment

* For improved EMC performance, connect Pin 3 to Earth Ground.

Figure 2-2 Pin Assignment

12345

RANGE:

TYPE: JKTEP

02 03 04 05 06 07 08 09 10

1 + Thermocouple

2 - Thermocouple

3 * Earth Ground

4 +Power/Signal Output

5 -Power/Signal Output

3.0 CALIBRATING THE TRANSMITTER

Calibration Setup:

To prepare the ice bath:

1. Fill a glass beaker with crushed ice made from distilled water.

2. Fill the beaker with enough distilled water so that the ice bath just becomes

slush, but not enough to float the ice.

3. Insert the reference thermocouple.

Figure 3-1. Calibration Setup using a Millivolt Source

SPAN

(—)

(+)

DMM

(4-20 mA)

MONITOR

DC SUPPLY

24 VDC

MULTIVOLT

SOURCE

DMM

ZERO

INPUT

THERMOCOUPLE

WIRE

ICE BATH

COPPER

WIRE

REFERENCE

PROBE

250 OHMS

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