A calibration system for PTU devices

Sari Saxholm, Martti Heinonen

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)


    Devices measuring pressure, temperature and humidity simultaneously are known as PTU devices. There are hardly any commercial calibration systems for the PTU devices available for low temperatures (<0 °C). To obtain more comprehensive data on the performance of PTU devices, a new calibration system is developed at MIKES. In this PTU Apparatus, pressure, temperature and humidity can be controlled simultaneously so that all combinations over the ranges are possible. The nominal ranges of the system are the following: absolute pressure 500-1100 hPa, temperature -52 °C to +80 °C and relative humidity 10-95%. The target uncertainties (k = 2) of the pressure, temperature and humidity are 10 Pa, 0,1-0,3 °C and 1-3% RH, respectively. The construction and operation as well as the results of operational tests of the PTU Apparatus are reported in this paper.

    Original languageEnglish
    Pages (from-to)1583-1588
    Number of pages6
    Issue number10
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed


    • Humidity
    • Pressure
    • PTU devices
    • Simultaneously control
    • Temperature


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