With RH CAL, temperature and relative humidity are controlled independently; therefore, the user is not limited to performing calibrations at the surrounding ambient temperature, which may not be appropriate for their 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.

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

Benefits:
EdgeTech field proven Optical Chilled Mirror (OCM) technology
Completely self-sufficient and portable humidity calibration system
Highest accuracy available for both RH and temperature (AT):

Temperature and RH controlled independently
Automatic correction for mirror contaminant's
Certified measurements against NIST traceable standards
Standard features, where others charge extra

The RH CAL employs a unique control scheme for maintaining such precise RH control. The system incorporates a pair of finely matched 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.