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Miniature Low-Cost Temperature 2-wire Transmitters

Miniature Low-Cost Temperature Transmitters


Item# TX91A-K7

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 C$205.49
5-9 C$195.22
10-24 C$191.11
25-49 C$182.89
50-99 C$178.78
100+ C$174.67

Please contact Technical Sales Team for assistance. Any remaining stock is available for purchase

Only 2 left

Limited Stock
Miniature Low-Cost Temperature Transmitters TX91A-K7 TX91A-K7
  • Two-Wire Transmitter for Thermocouples and RTD's
  • 4-20 mAdc Output
  • ±0.1% Accuracy
  • Upscale Break Protection

TX91A-K7 Model Options

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Input Ranges
Other Features
Number of Inputs
Input Type
Output Type

TX91A and TX92A Series are discontinued. As an upgrade substitute, please check out the new TXUN temperature transmitter for details.

The non-isolated TX90A Series transmitters convert thermocouple or RTD signals into a 4 to 20 mA dc signal output that is directly referenced to the mV input of a thermocouple or resistance of a 100 Ohm platinum RTD.

Introduction to Thermocouples For thermocouple transmitters, the 4 to 20mA output is not linearized. T/C transmitters are available for type K, J, T, and E with color coding for each T/C type. The transmitters for RTD’s are available with the 4 to 20mA output directly proportional to the input resistance or with the 4 to 20mA output linearized to tempearature.
Note: RTD’s are slightly non-linear with the resistance diverging from actual temperature by approximately 1% at the mid point of full scale. (For linearized RTD transmitters, specify “RTD-L”. Non-linearized transmitters are the more popular choice).

The TX90A transmitters mount directly within OMEGA’s standard protection heads for connection to your sensor. OMEGA also provides complete thermocouple and RTD assemblies.

Output Range: 4 to 20 mA dc
Zero and Span Adjustment Range: ±25% for °F and ±10% for °C
Accuracy: ±0.1% of FS (includes effects of linearity, hysteresis and repeatability) referenced to the mV input
Operating Temperature Range: -40 to 85°C (-40 to 185°F)
Storage Temperature Range: -46 to 121°C (-50 to 250°F)
Max Loop Resistance: (Vs – 8) / 0.020A
Supply Voltage: 8-50 Vdc, 24V nominal
Dimensions: 44.5 D x 31.75 mm H (1.75 x 1.25"); height includes terminal strip

Range Codes
11-L-40 to 60°C (-40 to 140°F)
J2K2T2E222-L-18 to 93°C (0 to 200°F)
J3K3T3E333-L-18 to 149°C (0 to 300°F)
J4K4T4E444-L-18 to 260°C (0 to 500°F)
J5K5T5E555-L-18 to 399°C (0 to 750°F)
J6K6E666-L-18 to 538°C (0 to 1000°F)
J7K7T7E777-L0 to 100°C (32 to 212°F)
J8K8T8E888-L0 to 150°C (32 to 302°F)
J9K9T9E999-L0 to 250°C (32 to 482°F)
J10K10T10E101010-L0 to 400°C (32 to 752°F)
J11K11E110 to 500°C (32 to 932°F)
Factory Scaling (-FS) is available for an additional charge. Please contact our engineering team for custom scaling.
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