A dead weight tester apparatus uses weights to apply pressure to a fluid for checking the accuracy of readings from a pressure gauge. A dead weight tester (DWT) is a calibration standard method that uses a piston cylinder on which a load is placed to make an equilibrium with an applied pressure underneath the piston. Deadweight testers are secondary standards which means that the pressure measured by a deadweight tester is defined through other quantities: length, mass and time. Typically deadweight testers are used in to calibrate pressure measuring devices.
This article needs additional citations for verification. (November 2019) |
Formula
The formula on which the design of a DWT is based basically is expressed as follows :
p | = | F / A | [Pa] |
where :
p | : | reference pressure | [Pa] |
F | : | force applied on piston | [N] |
A | : | effective area PCU | [m2] |
Piston cylinder design
In general there are three different kind of DWT's divided by the medium which is measured and the lubricant which is used for its measuring element :
- gas operated gas lubricated PCU's
- gas operated oil lubricated PCU's
- oil operated oil lubricated PCU's
See also
References
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.