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Dead weight testers are named so because they utilize dead weights in determination of pressures operating in a closed and compressed fluid system.
They are so called because of the reason that for each value of pressure to be exerted/ applied in the closed hydraulic system, a predetermined / fixed amount of weights are used to exert the force to counter balance the buoyancy forces.
Each weight is stamped with the equivalent amount of force that will be exerted on a predetermined area of piston cylinder arrangement by using that weight.
There fore the device is called Dead Weight tester.
DWT (Dead Weight Tester) is based on the principle of Pascal's law.
The law states that in a closed system of incompressible fluid, the pressure applied will exert equal amount of force in all the directions. In DWT system, silicon oil is used within the closed boundaries of the Piston cylinder arrangement, piping, pressurization chamber and in the head on which the gauge to be tested/ calibrated is fixed.
The oil is taken in to the pressurization chamber from oil bowl and all the air entrapped is vented off. This is because of the reason that air is compressible and hence do not allow pressure to be exerted equally in all the areas and there by create error in the test results.
Once the system is full with air free oil, pressure is gradually increased from the pressurization chamber.
Oil pressure starts increasing in all the areas including piston cylinder arrangement over which the dead weights are mounted.
As the force increases gradually and equals the amount of down ward force being exerted by the dead weights, the total system gains the state of equilibrium and just at that moment, the dead weights starts getting lifted up.
At this condition, the amount of force operating in the entire system is same. The sum of pressure values stamped on weights lifted is operating on the pressure gauge element also, which is under test/ to be calibrated. Necessary corrections are made in the zero/ span adjustments in gauges/ Pressure transmitters. Above sequence is repeated for all the values at 0%, 25%,50%,75% and 100% to check for linearity and repeatability. This is how the DWTs are working.
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DW-10 Range 2.5 Kg.Cm2
DW-11 Range 6 Kg/Cm2
DW-12 Range 16 Kg/Cm2
DW-13 Range 25 Kg/Cm2
DW-14 Range 40 Kg/Cm2
DW-15 Range 60 Kg/Cm2
DW-16 Range 100 Kg/Cm2
DW-21 Range 160 Kg/Cm2
DW-22 Range 250 Kg/Cm2
DW-23 Range 400 Kg/Cm2
DW-24 Range 600 Kg/Cm2
DW-25 Range 800 Kg/Cm2
DW-26 Range 1000 Kg/Cm2
2 free piston assemblies for giving Low Pressure range with smaller steps and High Pressure range with larger steps in a single instrument with substantial cost saving
DW-30 Low Range 16 Kg/Cm2 & High Range 160 Kg/Cm2
DW-31 Low Range 25 Kg/Cm2 & High Range 250 Kg/Cm2
DW-32 Low Range 40 Kg/Cm2 & High Range 400 Kg/Cm2
DW-33 Low Range 55 Kg/Cm2 & High Range 600 Kg/Cm2
DW-34 Low Range 75 Kg/Cm2 & High Range 800 Kg/Cm2
DW-35 Low Range 100 Kg/Cm2 & High Range 1000 Kg/Cm2
It is used for calibration of vacuum gauges and other sensing, transmitting and recording vacuum instrument. The 'RAVIKA' Vacuum Gauge Tester is a quick and convenient method of calibration free from the disadvantages of using the fragile mercury manometer.
Range 0 to 710 mmHg
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