Designed for use in hazardous environments, the HERMetic Onecal is an intrinsically safe portable digital thermometer for custody transfer, inventory control and verification of automatic systems including liquid storage tanks, tankers, barges, railcars and trucks.

Onecal stands for one reference point for calibration. The reference point is the ice point which can easily be reproduced. The calibration is done by simply pushing a button. The characteristics of the RTD sensor are stored in the memory of the instrument and are the same for any individual sensor. Therefore a change of sensor requires only an offset calibration. Replacing the cable only does not require a new calibration because of the built-in automatic cable compensation routine.

The modular design of Onecal makes the exchange of components extremely easy and cost-effective as no special training or tools are required. The ergonomic and rugged design of the housing allows for easy and safe cable storage.