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美國omega TX253變送器
熱電偶和RTD變送器
TX250 Series
熱電偶和RTD變送器
熱電偶和RTD模型available
可調跨度
非離體4 20mA輸出
微型尺寸
適合在NBI保護頭
高精度
高RFI immunity
DIP開關多收
低成本
安裝孔和帶我們centerline螺釘內# 8。
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 |
Transmitter Scaling Recommended (TX-SCALED) unless you have a source to scale the transmitter!
注釋: 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.
產品型號/產品描述
Transmitters (Factory Scaling Recommended)
TX251 Transmitter for J, K, T type thermocouples, Scaling Recommended see TX-SCALED Below
TX252 Transmitter for E type thermocouples, Scaling Recommended see TX-SCALED Below
TX253 Transmitter for R, S type thermocouples, Scaling Recommended see TX-SCALED Below
TX254 Transmitter for 3-wire 100 ohm platinum RTDs, Scaling Recommended see TX-SCALED Below
Transmitter Scaling
TX-SCALED Transmitter Scaled as requested within input range. After order placment you will be contacted for desired range
PSR-24S Regulated power supply, 24 Vdc, 400 mA, screw terminal
PSR-24L Regulated power supply, 24 Vdc, 400 mA, UL, stripped leads
PSR-24L-230 Regulated power supply, 24 Vdc, 400 mA, stripped leads, 230 Vac input, CE
PSU-93 40 Unregulated power supply, 16 to 23 Vdc, 300 mA max, screw terminal
美國omega TX253變送器
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