Dead Weight Gauges Calibrator

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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