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Why dead weight tester is used in industry?
A dead weight tester is an accurate calibration source of pressure. A dead weight tester uses weight over a precisely known area to produce an accurate output pressure. Uses would be precision calibration of gauges, transmitters, switches and level devices.
What is a dead weight tester?
because it uses those cylenders weights which are called dead weights " aliving weight is any weight that could changr"
Why it is called dead weight pressure tester?
it is called so because at dead weight the mass cannot move,it is constant.
How can a dead weight tester used to calibrate a gauge pressure?
Place the gauge inside a sealed piston. Place the weight on top of the piston and read the pressure from the gauge. The force exerted by the weight multiplied by the area of the piston will give you the actual pressure exerted on the gauge. Using SI units. A 5 kg weight placed on a 0.25 meter diameter piston will create a pressure of around 1 pascal (Nm^2). 5N*Pi*0.25m^2.
How to adjust the zero error in pressure gauge?
step-1:remove the pressure gauge from the equipment when machine is in off condition. step-2:remove the cap and glass of the gauge. step-3: remove the needle of the gauge with a needle puller( a special tool ) step-4: place the same needle indicating zero. step-5: fix the glass and cap as usual. step-5: check(calibrate) the gauge on a dead weight tester with a master degital pressure gauge.
Why a dead weight piston gauge called as dead weight?
because we are measuring weight in terms of pressure of static masses or weights means they are not moving and have a specific weight and as static thing refers to dead things that's why the masses are dead so the apparatus is called dead weight piston guage.
Where can you buy Dead Weight Pressure Tester Ashcroft 1305D-10?
Best way to find products for cheap is through Google Product Search. Here is a few sites that sell these. http://www.kvmtools.com/product_info.php?products_id=6580&osCsid=cdd41b815c2a03433a27d4d36c426677 http://secure2.data-comm.com/servlet/RBIS/-strse-112475/Tester-Pressure/Detail http://store03.prostores.com/servlet/dce2/the-80851/ASHCROFT-1305D10-Tester-Pressure/Detail
What is the principle or theory behind this dead weight gage tester?
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. Working Principle: DWT (Dead Weight Tester) works 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, pressurisation chamber and in the head on which the gauge to be tested/ calibrated is fixed. The oil is taken in to the pressurisation 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.
Why do you spin the weights on a dead weight tester during calibration?
When pumping, the weights should be rotated slowly to decrease cylinder wall friction.
What type of gas and liquid used in dead weight tester?
Jacob wala dito ang sagot..hahaha :P *** Sira ulo ka Phen hahaha!
What are dead weight pressure gauges?
The Deadweight Gauge is the most accurate instrument available for the pressure measurement. Repeatable readings with accuracies of 0.1%. 0.05% and 0.02% of measured pressure are obtainable. The device does not require recalibration unless the components have excessive wear of weights. It can be easily transported and set up in the field, requires minimum maintenance and is simple to operate.
What do you mean by calibration of a pressure gauge?
I used to do this for a living. The pressure guage is mounted on a testing machine (usually but not always a machine called a dead-weight tester) and the readings given by the pressure guage when known pressures are applied is noted. For example, a pressure of 300 pounds per square inch is applied and the guage reads 295 pounds per square inch when the pressure is rising, but might read 305 pounds per square inch when the pressure is falling. This difference in guage reading when pressure is rising to when pressure is falling is called hysteresis. A calibration certificate for the guage is issued showing the guage readings obtained at known pressures when pressure is rising and falling. In some cases, the guage readings may be very inaccurate and if the guage has some sort of adjustment mechanism, this may be adjusted to obtain more accurate readings.
