What is the purpose of dead weight pressure gauge?
A dead weight tester apparatus uses known traceable weights to apply pressure to a fluid for checking the accuracy of readings from a pressure gauge.
What does a dead weight tester measure?
Dead weight testers are the basic primary standard for accurate measurement of pressure. Dead weight testers are used to measure the pressure exerted by gas or liquid and can also generate a test pressure for the calibration of numerous pressure instruments.
How do you use a dead weight tester?
It works by loading the primary piston (of cross sectional area A), with the amount of weight (W) that corresponds to the desired calibration pressure (P = W/A). The pumping piston then pressurizes the whole system by pressing more fluid into the reservoir cylinder.
How does a dead weight pressure gauge work?
Dead Weight Tester (DWT) is a pressure measurement instrument that calibrates pressure based on the weight of force divided by the area the force is applied. DWT provides high accuracy in pressure gauge calibration and prevents the occurrence of an error in pressure reading.
How to calibrate a dead weight tester?
When the weights start to lift the gauge pressure should be the same as the pressure indicated by the weights. You can calibrate pressure gauges and pressure transducers very accurately if the weights are correct and there is minimum friction between the weight piston and the cylinder.
What should the pressure of a dead weight test be?
The use of high quality materials result in small uncertainties of measurement and excellent long term stability. Dead weight testers can measure pressures of up to 10,000 bar, attaining accuracies of between 0.005% and 0.1% although most applications lie within 1 – 2500 bar.
How does calibration of a pressure gauge work?
During calibration, the system is primed with liquid from the reservoir, and the system pressure is increased by means of the adjusting piston. As liquids are considered incompressible, the displaced liquid causes the piston to rise within the cylinder to balance the downward force of the weights.