Vaisala HUMICAP® HMT360 wall mount transmitter is designed specifically for hazardous and explosive environments. The entire transmitter can be placed into zone 0. There are six different models depending on the probe:
For measuring moisture in oil e.g. central lubrication systems, hydraulic systems, and power transformers, view details of the Humidity and Temperature Transmitter HMT368.
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HMT360 Series Intrinsically Safe Humidity and Temperature Transmitters