What is a dead weight 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.
What is a dead weight machine?
Share. Facebook. NIST’s million pounds-force deadweight machine is a mechanism used to calibrate force sensors — particularly, sensors that measure extremely large forces, such as those created by a rocket or jet engine.
Why is oil used in dead weight tester?
Dead weight testers are a piston-cylinder type measuring device. As primary standards, they are the most accurate instruments for the calibration of electronic or mechanical pressure measuring instruments. A special hydraulic oil or gas such as compressed air or nitrogen is used as the pressure transfer medium.
What happens if equipment is not calibrated?
INACCURATE RESULTS: If you do not calibrate your equipment, it will not give accurate measurements. When the measurements are not accurate, the final results will also be inaccurate, and the quality of the product will be sub-standard. SAFETY FACTORS: Uncalibrated equipment can pose a number of safety risks.
What is a dead weight tester apparatus?
The dead weight tester apparatus consists of a chamber which is filled with oil free impurities and a piston ā cylinder combination is fitted above the chamber as shown in diagram. The top portion of the piston is attached with a platform to carry weights. A plunger with a handle has been provided to vary the pressure of oil in the chamber.
What are dead weights and how are they used?
Dead weights are usually used for pressure gauge calibration as they come with high accuracy, So they can be used as primary standard (as mentioned before).there are many types of them depending on the application and they are operated with oil (hydraulic) or with air (pneumatic).
What affects the accuracy of a dead weight tester?
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 āgā.
How do you calibrate a deadweight tester?
The basic steps to perform calibration with a deadweight tester include attaching a pressure measurement device to the tester, applying a series of weights to generate known pressures, and comparing the known pressures to pressure readings from the device under test.
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