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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.
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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] |
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
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