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| 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. |
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| 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. |
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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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| The Model 234 and the Model 234D both include a serial interface. In addition to the Model 234 features, the Model 234D also provides local display of the temperature or resistance of a single sensor via a 6-digit LED display. It maintains full transmitter capabilities, serial interface commands, and curve format of the standard Model 234. The display is updated at one half the rate of the transmitter output. |
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| Model 234 Measurement Scales, Excitation, Resolution, and Accuracy |
Scale |
Sensor
resistance |
Sensor
excitation voltage |
Resolution |
Accuracy
±(%rdg + W) |
0 |
1 W to 6 W |
5 mV |
0.0003 W |
0.5 + 0.0006 |
1 |
4.5 W to 12.5 W |
5 mV |
0.0001 W |
0.1 + 0.0013 |
2 |
9 W to 60 W |
10 mV |
0.001 W |
0.1 + 0.006 |
3 |
45 W to 125 W |
5 mV |
0.001 W |
0.1 + 0.013 |
4 |
90 W to 360 W |
10 mV |
0.003 W |
0.1 + 0.036 |
5 |
290 kW to 1.25 kW |
10 mV |
0.01 W |
0.1 + 0.13 |
6 |
900 kW to 3.6 kW |
10 mV |
0.03 W |
0.1 + 0.36 |
7 |
2.9 kW to 12.5 kW |
10 mV |
0.1 W |
0.1 + 1.3 |
8 |
9 kW to 36 kW |
10 mV |
0.3 W |
0.1 + 3.6 |
9 |
29 kW to 300 kW |
10 mV |
6.8 W |
0.5 + 30 |
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