Vaisala
The HPP272 probe for the measurement of vaporized hydrogen peroxide (photo) can measure not only the hydrogen peroxide content (ppm) of bio-decontamination processes, but also temperature, relative humidity (RH, only water vapor) and relative saturation (RS, whole gas mixture). The probe’s sensor has a purge function that helps maintain measurement accuracy between calibrations and extends the operating life of the probe. This function heats the sensor rapidly to remove possible impurities left in the sensor’s polymer films. According to the manufacturer, the HPP272 probes require calibration only once a year and very little maintenance. The sensor’s intelligent measurement algorithm and heating function ensure water cannot condense on the sensor. This keeps measurement data reliable, even in extremely high humidities. — Vaisala Oyj, Helsinki, Finland