Unlike other comparative systems RH CAL is entirely selfsufficient. It does not  need compressed air or a water connection to operate, which allows this system to be truly portable.

With the RH CAL, temperature and relative humidity are controlled independently; therefore you are not limited to performing calibrations at the surrounding ambient temperature, which may not be appropriate for your unique
calibration protocol. Using EdgeTech’s Optical Chilled Mirror (OCM) primary measurement technique for traceability and feedback control, RH CAL is a standalone, portable humidity calibration system.

Continuing to RH CAL’s ease of use are features such as maintenance reducing Automatic Balance Cycle (ABC), and integral ambient temperature probe and D2 chilled mirror sensor which are located in the sample chamber providing not only superior accuracy but the fastest response.

The Model RH CAL employs a unique control scheme for maintaining such precise RH control. The system incorporates volumetric proportional control valves. By independently modulating the “Dry” and “Wet” valves from full-open to full-close,
and all points between, any desired humidity can be quickly generated and stabilized upon. Additionally, because the RH CAL is continuously monitoring the sample chamber conditions via its integral chilled mirror, it is able to instantaneously react to changes in humidity and maintain control stability.