Thermocouple and RTD Transmitters

TX250 Series

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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.

Signal Conditioners/Transmitters - View related products

Description

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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Part Number/ Desc.

Qty

Description

Transmitters (Factory Scaling Recommended)

TX253

AUD248.00

Availability: 1 week

Transmitter for R, S type thermocouples, Scaling Recommended see TX-SCALED Below

Power Supply

PSR-24S

Consult Sales

Availability:

Regulated power supply, 24 Vdc, 400 mA, screw terminal

PSR-24L

Consult Sales

Availability:

Regulated power supply, 24 Vdc, 400 mA, UL, stripped leads

PSR-24L-230

AUD149.82

Availability: 1 week

Regulated power supply, 24 Vdc, 400 mA, stripped leads, 230 Vac input, CE

PSU-93

AUD126.27

Availability: 3 weeks

40 Unregulated power supply, 16 to 23 Vdc, 300 mA max, screw terminal

† All amounts shown in AUD
Note: All transmitters require scaling. If TX-SCALED is not ordered, then scaling must be done in the field. Item required to scale include: means of simulation of the 0% and 100% input values, means to power and read the 4-20mA loop signal, understanding/ability to adjust dip switches and zero & span potentiometers.

Product Manuals:

Download TX254 - RTD Transmitter

Download TX250 Series - Two Wire Thermcouple Transmitters