The instrument has three control Keys on the front panel, through which the Operator can set the parameters and configure the instrument as desired. The instruments use a precision RH+T Sensor which may be built on-board, or on an extendable cable, and is factory calibrated for accurate display of ambient temperature and relative humidity.

The HTC series instruments provide independent Relay control for Temperature and Relative Humidity and also analog retransmission of 4-20 mA DC proportional to the measured Relative Humidity and Temperature for process control or logging purposes. It also offers a RS485 communication signal (on Modbus RTU protocol) of these parameters, for remote monitoring. The instrument operates on 24 VDC (or optionally on AC mains power) and is offered in a rugged polycarbonate enclosure in wall-mount or panel mount execution. The bright OLED display provides clear indications of the relative Humidity and Temperature values.