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Current Loop Transmitter For Temperature Sensor

2014-11-16 10:34  
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Current loop interface has been widely used in industrial environment because it’s robustness. Noise resistance and fail detection capability? made it suitable for long distant transmission in harsh environment. This circuit provide current loop transmitter for temperature sensor. Here is the circuit’s schematic diagram:


current loop transmitter temperature circuit schematic

The temperature measurement is done by LM35  temperature sensor chip. You can use general silicone diode such as 1N4001.  The current controller function is done byLM317 current/voltage regulator. This circuit will draw a consistent current proportional to the temperature being measured, regardless the supply? voltage variation caused by noise or long wire’s temperature-dependent resistance variation. [Circuit's schematic sources: National Semiconductor's LM 35 Centigrade Temperature Sensor Application Note]


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