Low-Cost Box Temperature Sensor Application
If you need a simple way to monitor temperatures inside an enclosure, Acromag’s ST132 is compact, inexpensive and provides 4-20mA output. The tiny, puck-style unit is only 1.75 inches in diameter and easily scaled for -40 to 80°C input. Just mount the transmitter inside your panel and jumper short the input terminals to measure ambient temperature without a sensor. Then wire the 4-20mA output to your PLC, DCS, controller, or recorder. You now have a low-cost box temperature sensor with 4-20mA output proportional to -40 to 80°C inside the box. No thermocouple or other sensor is necessary. This approach uses the internal cold-junction compensation ambient temperature sensor within the ST132 transmitter. The ST132 is highly accurate, stable, and it's a cost effective temperature transmitter solution!