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Thermocouple and RTD Transmitters

Item# TX250

In stock

Lead Time ( If not in Stock): 0 week

Thermocouple and RTD Transmitters TX250 TX250
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  • 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.
5 Year Warranty

Product Specs

Please check out Newest Released 2-wire Transmitters with Standard, FM & Hart Models Available TXUN Series for more advanced features and excellent usability.

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 ID suitable for 8-32 screw
Dimensions: 44 Dia x 33 mm H (1.7 x 1.3") including the terminal block.
Weight: 50 g (1.5 oz)

TX250 Thermocouple Input Specifications
Input:
TX251: thermocouple type K, T, J
TX252: thermocouple type E
TX253: thermocouple type R, S
Calibration: Two "Zero" DIP switches, three "Span" DIP switches and two fine-tuning trimmers
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 to the mV input from the thermocouple, not to temperature.



TX250 RTD Input Specifications
Input: 3-wire Pt-100 according to BS 1904 and DIN 43760 characteristics
Input Span Range: 30 to 800°C
Input Zero Range: -50 to 200°C
Calibration: Three "Zero" DIP
switches, three "Span" DIP switches and two fine-tuning trimmers
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
TX254 RTD
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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