What is a deadweight tester used for?

What is a deadweight tester used for?

A deadweight tester is a calibration standard that uses the principle of a pressure balance to calibrate pressure measuring instruments. Deadweight testers use calibrated weights to apply known pressures to a device under test for a simple and cost-effective solution that covers a wide range of pressure calibrations.

How do you calibrate a dead weight tester?

The calibrated characterization of deadweight testers involves the transfer of effective areas of one piston and cylinder to another utilizing pressure based cross-float techniques. To use this technique, identical piston and cylinders are placed in identical mountings with the output pressures connected.

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.

What is a dead weight pressure gauge?

What is a Dead Weight Tester? 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 are the limitations of dead weight pressure gauge tester?

Limitations: the accuracy of the dead weight tester is affected due to the friction between the piston and cylinder, and due to the uncertainty of the value of gravitational constant ‘g’.

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.

What factors affect the accuracy of dead weight tester?

Potentially, the largest factor affecting accuracy in a deadweight tester is local gravity. Gravity varies slightly from one location to another (see map). This has an impact on the nominal pressure increments of a deadweight tester.

How do you calculate pressure gauge error?

Calculated according to the full-scale error, its error is +-(2MPa*0.5%)=+-0.01MPa. In other words, for a digital pressure gauge with an accuracy of 0.5% FS from 0 to 2 MPa, its full-scale error is +-0.01 MPa.

What are the factors affecting the accuracy of dead weight tester?

Are there any pressure testers available for dead weight testing?

Both pneumatic and hydraulic dead weight testers are available. Click here for a comparison of our pressure products. ± 0.015% of reading; to 30 psi / 2 bar This easy-to-use primary standard provides reliable and accurate pressure measurement in the field, or in a lab.

What is deadweight tester calibration?

Deadweight tester calibration is the act of comparing the readings of a device under test, such as a pressure gauge, to the known pressures produced by precise weights.

How accurate is the RK pneumatic dead weight tester?

± 0.015% of reading; to 300 psi / 20 bar The RK floating ball type pneumatic dead weight tester is engineered to offer user-friendly, safe operation to 300 psi. ± 0.025% of reading; to 1500 psi / 100 bar The HK floating ball type pneumatic dead weight tester provides accurate pressure measurement in a lab.

What is the accuracy of a pressure tester?

± 0.05% of reading; to 3000 psi / 200 bar This primary standard features a re-entrant measuring piston & cylinder assembly, helping to maintain accuracy as pressures increase. ± 0.015% of reading; to 15 000 psi / 1000 bar This tester offers lab accuracy in an instrument designed to withstand an industrial environment or daily manufacturing use.