Using a Dual Piston with a Deadweight Tester

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The DH Budenberg Deadweight Tester models CPB5800 and CPB3800 can be equipped with a dual piston.

A dual piston can greatly increase the range of a deadweight using only a single set of weights. There is a small diameter, high pressure piston that rotates within a larger diameter, low pressure piston. The low pressure piston is active when at lower pressures, and as the pressure in the system increases to a given level, the low pressure piston becomes the cylinder in which the high pressure piston rotates. This provides two different, cross sectional areas in a single piston cylinder assembly, which allows the deadweight tester to generate two different pressures (low and high) with a single mass loading. The video below gives a succinct graphical description of how this is accomplished:

For example, a CPB5800 with one set of masses can generate from 10 to 800 psi by utilizing the low pressure piston, and generate 200 to 20,000 psi with the high pressure piston.

Deadweight Testers

Available with Dual Pistons