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2

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.

Содержание NB2TX93A-J2

Страница 1: ...e mail info omega com For latest product manuals www omegamanual info TX93A J K T E 4 20 mA Ultra Miniature Temperature Transmitters TM Shop online at omega com User sGuide...

Страница 2: ...pecifications without notice omega com info omega com 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 Cana...

Страница 3: ...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 Equipmen...

Страница 4: ...gure 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 Alterna...

Страница 5: ...rd 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 exp...

Страница 6: ...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 record...

Страница 7: ...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...

Страница 8: ...o 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 Thermocoup...

Страница 9: ...ounting 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...

Страница 10: ...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...

Страница 11: ...Number TRP Thermocouple Type J K T E 3 2 Set Up of Equipment To prepare the ice bath Refer to Figure 3 1 a Fill a glass beaker with crushed ice made from distilled water b Fill the beaker with enough...

Страница 12: ...model number For example for Model TX93A J2 the Z input is 0 886 mV and the S input is 4 907 mV If a Thermocouple Calibrator Simulator is used such as the Model CL511 Precision Calibrator select the...

Страница 13: ...9 3 3 Calibration Procedures continued Figure 3 1 Transmitter Calibration Set Up Figure 3 2 Transmitter Calibration Set Up Alternate...

Страница 14: ...2 255 40 120 F E1 2 255 2 977 0 200 F T2 0 675 3 968 E2 1 026 5 871 0 300 F T3 0 675 6 648 E3 1 026 9 710 0 500 F T4 0 675 12 574 E4 1 026 17 945 0 750 F T5 0 675 20 803 E5 1 026 28 857 0 1000 F E6 1...

Страница 15: ...rmula Loop Resistance maximum Vsupply 8 V 0 020A For example a 24V power supply would give a maximum loop resistance of 16 V 0 020A 800 ohms c Make sure the power supply is rated for at least 28 mA ti...

Страница 16: ...uency Response 3dB 3Hz Thermal Zero Shift 0 01 F of span span 10 mV 0 02 F of span 4 10 mV span Thermal Span Shift 0 01 F of span Output Current Output Span 4 20 mA dc Current Output Limits 3 to 28 mA...

Страница 17: ..._ ________________________________________ ________________________________________ ________________________________________ ________________________________________ __________________________________...

Страница 18: ..._ ________________________________________ ________________________________________ ________________________________________ ________________________________________ __________________________________...

Страница 19: ...A if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to m...

Страница 20: ...s M U Turbine Paddlewheel Systems M U Totalizers Batch Controllers pH CONDUCTIVITY M U pH Electrodes Testers Accessories M U Benchtop Laboratory Meters M U Controllers Calibrators Simulators Pumps M U...

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