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Hydraulic dead weight tester-Model YWT

Measuring range: 0.04-160MPa
Accuracy: 0.005%; 0.01%; 0.02%; 0.05%


Working Principle
Mechanical dead-weight testers or primary standards are the most accurate reference instruments for pressure. Their functional principle is based on the physical principle of pressure = force/area. Mass pieces placed on the top of a piston-cylinder system are the source of a precisely defined force. By producing a certain (counter) pressure inside the pressure balance an equilibrium is achieved: the mass pieces, including the free-running piston of the piston-cylinder system, are floating, which will lead to a very accurate pressure at the test port.

1.primary standard for defining the pressure scale in a range of up to 160MPa
2. pressure reference for factory and calibration lab for the testing, adjustment and calibration of pressure measuring instruments.

Order guide      

Measuring range (MPa)0.04-0.60.1-60.5-251-602-1002-160

Accuracy: 0.005%F.S.; 0.01%F.S.;  0.02%F.S.;  0.05% F.S.


piston system: tungsten carbide
Weight: Non-magnetic stainless steel (level 0.005, 0.01, 0.02);
Carbon steel (level 0.05)
Base: stainless steel

Working medium:
<25MPa: the mixed oil (transformer oil and kerosene oil)
≥25MPa: sebacate oil


  •   Accord with JJG59-2007<<Piston-type pressure gauge>>;

  •   Able to test two gauges synchronously; Applied the fast pressure plug; no oil leakage;

  •   Abrasive resistance is improved because of the high-tensile and high-hardness wolfram carbide material;

  •  The piston rod is anti breakage structure.

  •  The piston system configures Eddy current displacement sensor,adopts integrated double row LCD digital cursor display ( which is firstly invented in China), therefore  piston  position can be observed anytime, which is sensitive, intuitional,accurate.

  •  With pre-pressure pump, it can fill oil to large capacity gauge, several gauges or long distance calibration pipeline system.

  •   The tester junction with stop valve and piston stop valve, so it can be used as independent pressure source, when piston stop valve is closed.