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Thermocouple and RTD Models Available
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Adjustable Span
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Non Isolated 4 to 20 mA Output
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Miniature Size
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Fits in NB1 Protection Head
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High Accuracy
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High RFI Immunity
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Dip-Switch Multi-range
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Low Cost
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Mounting Holes on Centerline and Take #8 screws.
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View related products - Signal Conditioners/Transmitters
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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.
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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
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Input Type
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Span Range*
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Minimum Span
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Zero Offset Range
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| TX251
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J
| -100 to 750°C
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85°C
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-100 to 50°C
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| -148 to 1380°F
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155°F
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| K
| -100 to 1350°C
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105°C
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-100 to 100°C
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| -148 to 2440°F
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190°F
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| T
| -100 to 400°C
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100°C
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-100 to 100°C
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| -148 to 750°F
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180°F
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| TX252
| E
| -100 to 1000°C
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75°C
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-100 to 30°C
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| -148 to 1832°F
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135°F
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| TX253
| R
| 0 to 1750°C
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600°C
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0 to 750°C
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| 32 to 3180°F
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1080°F
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S
| 0 to 1750°C
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600°C
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0 to 750°C
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| 32 to 3180°F
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1080°F
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| TX254
| RTD
100 ohm Pt
| -50 to 750°C
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30°C
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-50 to 300°C
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| -58 to 1380°F
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54°F
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Transmitter Scaling Recommended (TX-SCALED) unless you have a source to scale the transmitter!
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† All dollar amounts on this site are shown in US currency.
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.
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| Related Links -
Manual, Related Products
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| Product Manual |
| Download TX254 - RTD Transmitter |
| Download TX250 Series - Two Wire Thermcouple Transmitters |
| Related Products |
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TXUN-HT: |
| 2 Wire Transmitter Hart Protocol Enabled |
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TXUN-KIT: |
| TXUN Tool Kit for USB Communications Interface |
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