Enthalpy Transmitter

ACI manufacturers a high quality, yet economical, Enthalpy transmitter that converts a resistive type humidity sensor into a linear 2-wire, 4 to 20 mA output. Its signal is proportional to a scale of 0 to 50 BTU’s and is geared towards OEMs of economizers and other devices that need an enthalpy rated input.

The ACI Enthalpy line incorporates an Advanced Ceramic Technology. This
technology overcomes the limitations of other resistance-based humidity
sensors that utilize water-soluble polymer coatings. This technology enables these sensors to fully recover from condensation and enables the sensor to maintain its accuracy over time. Despite its accuracy, the Advanced Ceramic Technology sensor and related circuitry is economical.

Each unit is calibrated at 3 different points, using an NIST Traceable
temperature and humidity controlled environmental chamber. Factory
selectable calibration can be achieved for elevations of 0, 1000, 2000, 3000,4000, 6000, 8000, and 10000 feet. Reverse Action makes the slope negative,from 20 down to 4 mA.