How do you calibrate a pressure gauge with a dead weight tester?

How do you calibrate a pressure gauge with a dead weight tester?

Step 1: Connect the pressure gauge to the test port on the dead weight tester as shown in the diagram above. Ensure that the test gauge is reading zero, if not correct the zero error and ensure that the gauge is reading zero before proceeding with the calibration exercise.

Why the dead weight testers are used for calibrating pressure gauges?

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.

What is the calibration range of dead weight tester?

Maximum Ranges: Pneumatic pressure calibration is possible to ranges up to 5000 psi. Hydraulic pressure calibration is possible to ranges up to 116,000 psi. How Does a Deadweight Tester Work?

How do you use the dead weight tester?

In dead weight tester, we put the weight on the weight stand of dead weight tester putting weight is reference weight which is to be calibrate and further we applied pressure by moving piston ,when applied pressure and reference weight(Pressure)is equal at this condition reference weight will be zero(Dead).

Why it is called dead weight tester?

Dead weight testers are named so because they utilize dead weights in determination of pressures operating in a closed and compressed fluid system.

How does a dead weight pressure gauge work?

In a deadweight tester, the force is supplied by a mass in a gravitational field on top of a piston with a specific cross sectional area. The fluid (pneumatic or hydraulic) under the piston is pressurized so the piston and mass “float” in equilibrium.

Why the dead weight tester is such a good pressure reference?

The biggest benefit of using deadweight testers is in their completely mechanical nature, which preserves the principles of measurements derived directly from SI units. This, in turn, means higher accuracies and traceability of measurements, making them the most widely known primary pressure reference standards.

Do pressure gauges require calibration?

Pressure gauges are very common instruments in the process industry. As with any measurement device, pressure gauges need to be calibrated at regular intervals to assure they are accurate.

What is pressure calibration?

Pressure calibration is the comparison of the output of a pressure gauge or other measuring device against a standard instrument of higher accuracy.