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Product Groups
Thermocouple and RTD Transmitters
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
TX250 Series
  • Thermocouple and RTD Models Available
  • Adjustable Span
  • Non Isolated 4 to 20 mA Output
  • Miniature Size
  • Fits in NB1 Protection Head
  • High Accuracy
  • High RFI Immunity
  • Dip-Switch Multi-range
  • Low Cost
  • Mounting Holes on Centerline and Take #8 screws.
 Manuals (contact with email : [email protected])


TX250 Series
Thermocouple Input
The TX250 Series are non-isolated two-wire transmitter which convert the T/C thermoelectric voltage into a standardized load-independent, 4 to 20 mA process current.

The TX250 Series are housed in metal enclosures and fit into NB1 connection heads. The transmitter’s enclosure provides excellent RFI immunity.

The transmitter calibration is set by six dip-switches located behind the top cover. There are three basic models which cover the various T/C types. TX251 is for T/C types K, T and J; TX252 is for type E and TX253 is for type R and S.

Dip-switch arrays select the T/C type, and set the "Zero" coarse level and the "Span" coarse range.

Zero and Span trimmers provide the fine tuning calibration.

TX254 RTD Input
The TX254 is a non-isolated two-wire transmitter which converts the measuring signal of a 3 wire 100 ohm Pt RTD into a standardized load-independent, 4 to 20 mA current which is linearly proportional to the measured temperature.

The TX254 transmitter is provided with excellent lead resistance compensation and Pt-100 linearization conforming to BS1904 and DIN 43760 characteristics (a = 0.00385).The transmitter calibration is set by six dip-switches located behind the top cover.

Three dip-switches set the lower measured coarse temperature and the other three dip-switches set the measured coarse temperature span.

Zero and Span trimmers provide the fine tuning calibration.

General Specifications
Output Current:4 to 20 mA, 28 mA limited
Supply Voltage: 10 to 36 Vdc
(24 Vdc recommended)
Supply Variation Effect:<0.001%/1V change
Accuracy: Better than 0.1% of span
Load Resistance:Rmax () = (Vsupply - 10)/.02
Temperature Stability:<0.01% of span/1°C
Operating Temperature:-20 to 70°C (-4 to 158°F)
Humidity: 5 to 95% RH,non condensed
Housing: Die-cast zinc alloy
Mounting Holes: 5 mm IDsuitable for 8-32 screw
Dimensions: 44 Dia x 33 mm H (1.7 x1.3") including the terminal block.
Weight: 50 g (1.5 oz)

TX250 Thermocouple InputSpecifications
TX251: thermocouple type K, T, J
TX252: thermocouple type E
TX253: thermocouple type R, S
Calibration: Two "Zero" DIPswitches, three "Span" DIPswitches and two fine-tuningtrimmers
Cold Junction Error:±0.9°C (1.6°F) typical(3°C [5.4°F] for R and S)for 0 to 60°C (32 to 140°F)
Linearity (refer to mV input):<0.08% of span
Note: Transmitters are linear tothe mV input from thethermocouple, not to temperature.


TX250 RTD InputSpecifications
Input: 3-wire Pt-100 accordingto BS 1904 and DIN 43760characteristics
Input Span Range: 30 to 800°C
Input Zero Range: -50 to 200°C
Calibration: Three "Zero" DIP
switches, three "Span" DIPswitches and two fine-tuningtrimmers
Sensor Lead Resistance:50 maximum (two ways)
Lead Compensation Error:<0.05°C/10 lead resistance
Sensor Excitation: <1 mA
Linearity: Better than 0.08% of span

 Model No  Input Type   Span Range*   Minimum Span   Zero Offset Range 
TX251 J -100 to 750°C 85°C -100 to 50°C
-148 to 1380°F 155°F
K -100 to 1350°C 105°C -100 to 100°C
-148 to 2440°F 190°F
T -100 to 400°C 100°C -100 to 100°C
-148 to 750°F 180°F
TX252 E -100 to 1000°C 75°C -100 to 30°C
-148 to 1832°F 135°F
TX253 R 0 to 1750°C 600°C 0 to 750°C
32 to 3180°F 1080°F
S 0 to 1750°C 600°C 0 to 750°C
32 to 3180°F 1080°F
100 ohm Pt
-50 to 750°C 30°C -50 to 300°C
-58 to 1380°F 54°F

Transmitter Scaling Recommended (TX-SCALED) unless you have a source to scale the transmitter!
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