Dead Weight Tester

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Dead Weight Tester

Dead Weight Testers are considered "primary" standards for pressure. "Primary" can have two semantic connotations: one meaning that a dead weight tester generates pressure using the primary physical quantities mass and length; the other denotes that a dead weight tester is at the top of the hierarchy of metrological devices used to generate and calibrate pressure. Either way you define it, dead weight testers have been the primary source for pressure measurement in calibration labs for many years.

A dead weight tester uses weights (mass) stacked on top of a piston / cylinder mechanism that is in equilibrium with a fluid (pneumatic or hydraulic) which exerts a force on the cross sectional area of the piston. A simple equation describes this equilibrium and is the basic definition of pressure: P = F/A. Where P = Pressure, F = Force and A = Area. In the case of a dead weight testers, "P" is the pressure of the fluid under the piston, "F" is the force created by the stacked masses within a gravitational field, and "A" is the cross sectional area of the piston. Together, these primary physical quantities are used to generate a highly accurate pressure which can be ported into a device being tested or calibrated. The "How does a deadweight tester work?" Video describes this in some detail.

WIKA Dead Weight Testers on the Mensor Site

WIKA and DH Budenberg Dead Weight Testers

WIKA and DH Budenberg branded dead weight testers offer a complete scope of hydraulic and pneumatic deadweight testers used in a variety of applications. The DH Budenberg industrial dead weight testers, and WIKA laboratory dead weight testers can be seen under the "Primary Standards & Deadweight Testers" section of this website. In these pages we offer dead weight testers for field applications, test benches and the laboratory. The CPB5800, CPB5000 CPB3800 and can all be supplied with a dual piston assembly which increases the range of the dead weight tester by utilizing two piston cylinders in a single mechanism. A high pressure piston rotates inside a low pressure piston which rotates in the main cylinder. As the pressure increases it acts on the effective area of the low pressure piston and the high pressure piston, at a specific pressure the low pressure piston becomes the cylinder in which the high pressure piston rotates. This in effect allows the pressure to act on two different effective areas depending on the pressure exerted on the pistons.

Maximum Ranges:

Pneumatic Pressure Calibration is possible to ranges up to 5000 psi

Hydraulic pressure calibration is possible to ranges up to 116,000 psi.

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