Dead weight testers are the
well-known laboratory testing equipment
which uses noticeable weights to exert pressure to a lubricant for measuring
the precision of readings from a pressure gauge. DWT or Dead Weight Tester is a
calibrated standard test method that uses a piston cylinder on which a weight
is positioned to make a balance with an exerted force on the piston. Dead weight testers are also known as primary
standard test methods which mean that the
pressure measured by the equipment is expressed
in other units of mass, length, and time.
Usually, dead
weight testers are used in calibration laboratories to standardize pressure
transfer standards like electronic force measuring devices.
Generally, there are three different types of dead weight testers
which are divided by the medium which is
calculated and the lubricant on the basis of which various measurement are done,
namely, Gas operated gas lubricated Piston cylinder units (PCU), Gas operated oil lubricated Piston cylinder units,
oil operated oil lubricated PCU’s. Here are
1)
Gas –
Gas – Before making use of it, make sure the PCU is clean as the operation
of the PCU is responsive to contamination.
2)
Gas –
Oil – Oil of the PCU usually leaks in the gas circuit of the dead weight
tester. Hence, a small reservoir is
provided in the system. Hence, before commencing the calibration, it is good practice to clean the reservoir.
3)
Oil –
Oil – Make sure that the DUT oil will not come in contact with the Dead
weight tester oil, for high accuracy measurement. Friction can be minimized by
rotating the piston.
Presto offers Dead Weight Tester to test the
quality of Pet and Preform bottles. These are highly accurate and stable
pressure standards widely used in industrial laboratories, research institutes
and in academia to standardize pressure measurement devices like Pressure
Gauges, Vacuum Gauges, Transmitters, Pressure Transducers, Recorders, etc.
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