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More about the 231/231P/234 Temperature Transmitters

​Once one of the 230 Series obtains temperature data, it transmits a current of 4 mA to 20 mA. The current output changes linearly with sensor temperature. Output scale depends on the selected temperature range. Several switch-selected ranges are available. Highest accuracy and sensitivity are achieved when the output is set for a narrow temperature band. A 0 mA to 20 mA output is also available to convert output to a voltage scaled from zero. A 500 W, ±0.02% output load resistor produces the maximum full-scale output of 10 V.

​Circuitry for the Model 230 Series is powered by a single +5 VDC supply applied either from the front panel connector or the power pins on the VME bus connector. The outputs are isolated so several transmitters can be run off the same supply without interference.

​Mechanical mounting is easy because the 230 Series is built on a standard size VME card. It fits directly into a single height (3U) VME card holder. The transmitter does not use the electrical bus format, only its physical shape and power supply.

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Model 234 Measurement Scales, Excitation, Resolution, and Accuracy

Scale
Sensor
resistance
Sensor
excitation voltage
Resolution
Accuracy
±(%rdg + Ω)
0
1 Ω to 6 Ω
5 mV
0.0003 Ω
0.5 + 0.0006
1
4.5 Ω to 12.5 Ω
5 mV
0.0001 Ω
0.1 + 0.0013
2
9 Ω to 60 Ω
10 mV
0.001 Ω
0.1 + 0.006
3
45 Ω to 125 Ω
5 mV
0.001 Ω
0.1 + 0.013
4
90 Ω to 360 Ω
10 mV
0.003 Ω
0.1 + 0.036
5
290 kΩ to 1.25 kΩ
10 mV
0.01 Ω
0.1 + 0.13
6
900 kΩ to 3.6 kΩ
10 mV
0.03 Ω
0.1 + 0.36
7
2.9 kΩ to 12.5 kΩ
10 mV
0.1 Ω
0.1 + 1.3
8
9 kΩ to 36 kΩ
10 mV
0.3 Ω
0.1 + 3.6
9
29 kΩ to 300 kΩ
10 mV
6.8 Ω
0.5 + 30