Humidity Calibration for any type of probe
The CM1 is a manifold used for the calibration of RH and dew point probes in a variety of scenarios. It features 6 probe ports, each of which can be fitted with an adapter to fit any probe between 4 and 30 mm in diameter. A series of PRT insertion points are included so that thermal gradients through the manifold can be determined using multichannel reference thermometers such as the MBW T12.
The inlet and outlet of the CM1 are standard Swagelok 6mm fittings. These can be connected to any type of humidity generator, reference hygrometer or calibration rig where a gas flow is available. The complete assembly is placed in to a controlled environment in the range -50…200 °C. The high thermal mass of the CM1 stabilises temperature fluctuations, so humidity stability is based only on the humidity generator.
Most RH probes include temperature measurement. Correctly used, the CM1 will allow the calibration engineer to simultaneously calibrate integrated temperature measurement.
Either the RH probe ports or the PRT insertion points on the top of the CM1 can be used for thermometer calibration. The CM1 can be placed in to a climatic chamber, or placed on to a temperature controlled surface. The high thermal mass of the CM1 reduces short term temperature fluctuations, but increases response to changes, so proper evaluation is essential to resolve best measurement capability.
Configurable Probe Ports
Each probe port connects in series to the gas flowing through the manifold. Probe adapters are available in plastic (Acetal) for use over the range -20…80 °C, and aluminum for the range -50…200 °C. The adapters are carefully produced to provide a close fit into the manifold to minimize leaks and maintain good thermal contact.