Michell Instruments S503 portable humidity calibrator

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Michell Instruments has upgraded its S503 portable humidity calibrator with an optional, external battery pack. Michell introduced the modification in response to requests from users who found that many of the locations on their sites where calibrations were made did not have easy access to mains electricity. The battery pack provides 12 h or more of continuous use from a single charge, allowing a full day of calibrations to be completed on-site.

The S503 portable humidity calibrator is designed for calibrating RH sensors. It can be used by most staff as no specialist training or experience is necessary.

Users simply connect up to seven probes, set the desired humidity with the front panel switches and wait for the humidity within the calibration chamber to stabilise. Response time is fast - stabilisation occurs within 10 minutes of setting the relative humidity, enabling a 3-point calibration to be carried out in around an hour. At less than 2 kg in weight and 24 cm wide, the instrument is compact and easy to transport. A convenient carry case is also available to hold the calibrator and its accessories.

Using the S503 in combination with a Michell chilled mirror hygrometer, such as the Optidew Vision, users can create a transportable, traceable humidity calibration system.