18 January 2011
The relative humidity probe has been installed at the top of Monte Rosa at an altitude of over 4000m above sea level, and has been in use since the year 2000. The instrument, which uses Michell’s I7000 RH module, was chosen because it out-performed all the alternatives in tests. Key to its performance, we are told, is the unique six-point calibration the I7000 undergoes during production, when each module is calibrated to 3 RH points at two temperatures. This calibration can be modified to suit particular applications, such as the exposed and extreme conditions at the summit of a mountain. The I7000 is easily interchangeable to make maintenance simple. To ensure continued reliability at the top of a mountain, the module is replaced every two years. The I7000 Hygrosmart interchangeable module forms the basis of a complete range of temperature and humidity instruments, suitable for applications from precision manufacturing to controlled environments and HVAC – as well as meteorology.
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