Michell Instruments HygroCal100 verification system for humidity probes

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Weighing just 3.2 kg and with a battery life of up to 8 h, the Michell Instruments HygroCal100 verification system for humidity probes is designed with portability in mind.

The humidity test chamber allows the evaluation of relative humidity sensors in the range of 5–95% RH. Up to seven probes, with different diameters and output signals, can be validated simultaneously. The HygroCal100’s design allows the probes to be integrated with the chamber and user interface, enabling the operator to easily monitor the readings of each probe during the calibration cycle. The calibration data can be downloaded from the unit on to a USB drive for later use.

An external reference hygrometer, such as Michell’s fundamental, chilled mirror Optidew Vision, can be integrated into the system. If this reference has a traceable calibration, it allows users to incorporate this traceability into their verifications.

The unit is easily programmable through its touchscreen interface, enabling calibration routines to be completely automated. The operator defines the humidity points, and time to remain at each of them, inserts the probes and the reference (if used), then leaves the unit to work through the cycle.

The HygroCal100 contains an internal polymer reference — Michell’s latest generation HS3 sensor, giving ±0.8% RH accuracy. For long-term reliability, the HygroCal100 can be calibrated against an external reference. This is an automatic function: once the reference is connected and the calibration initiated, the HygroCal100 automatically runs through the steps and prompts the user for actions.