Abstract
Abstract. In the process and manufacturing industry, pressure is one of the variables that most often need to be recorded and monitored. Whether in standard applications or under special operating conditions, each application requires pressure gauges that are perfect for their needs. In Germany, pressure gauges are calibrated by accredited calibration laboratories, according to guideline DKD-R 6-1 (DKD-R 6-1, 2014). This calibration guideline establishes minimum requirements for the calibration procedure and the measurement uncertainty calculation when calibrating pressure gauges. In addition to the uncertainty contributions due to the calibration, the uncertainty contributions due to the specific application, like extreme temperatures, high pressure in containers, extreme height differences, shocks, aggressive media or problematic physical product properties, should be taken into account. This paper presents the approach in which the measurement uncertainty can be calculated in industrial pressure measurements. Furthermore, the individual uncertainty contributions and their identification or origin are discussed. Finally, an example of a measurement uncertainty budget is shown as an important tool in the measurement uncertainty calculation.
Highlights
In industry, various types of pressure gauges like bourdon tube manometers, electrical pressure gauges, or pressure transmitters with electrical output are used
Pressure gauges are available in various designs: more than 150 measuring ranges are available from approximately 25 mbar to 15 000 bar in the most important internationally used units as gauge pressure, absolute pressure, and vacuum, and as ± measuring ranges
Pressure gauges can have over 15 output signals, including various current and voltage signals, RS232 and bus signals
Summary
Various types of pressure gauges like bourdon tube manometers, electrical pressure gauges, or pressure transmitters with electrical output are used These types differ in their construction, functionality, and measuring principle. This guideline was drawn up by the “Pressure and Vacuum” DKD Technical Committee, in cooperation with the PTB and the accredited calibration laboratories It specifies minimum requirements for the calibration procedure and for the measurement uncertainty in the calibration of pressure gauges. Depending on the desired measurement uncertainty, pressure gauges are calibrated according to different sequences and their respective measurement series number. Depending on the desired measurement uncertainty or accuracy of the calibration object, the measurements are carried out at different numbers of pre-loadings and measuring series (see Table 1). The user of the pressure gauge should do additional investigations to quantify these uncertainty contributions which are relevant for the specific application
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