A calibration system for PTU devices

✍ Scribed by Sari Saxholm; Martti Heinonen

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 598 KB
• Volume: 43
• Category: Article
• ISSN: 0263-2241
• DOI: 10.1016/j.measurement.2010.09.004

✦ Synopsis

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 À52 °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.