Most air hand pumps that are designed to be used as pressure calibrators include a coarse pressure generator and a fine pressure adjuster. The effectiveness of both is dependent on the test volume connected to the pump.
The coarse or main pressure generator is typically a piston and cylinder arrangement which is actuated either by a set of calipers, a plunger, or a lever. The coarse change in pressure is applied by compressing the air to a high level inside a small cylinder which is then released to the lower pressure test volume increasing the pressure upon each cycle of the pump.
The fine pressure adjuster is a thumb-screw mechanism that incrementally reduces or increases the closed test volume which in turn changes the stored pressure by an equivalent proportion in accordance with Boyle’s Law.
Featured calibration hand pump products
2,500 bar / 37,500 psi Hydraulic Pressure Calibration Pump – ADT949 - The ADT949 hydraulic ultra-high pressure test pump is a hand operated pressure pump designed to generate pressure up to 37,500 psi (2500 bar).
PGS700 High Pressure Calibration Hand Pump - Hydraulic hand pump for applying test and calibration pressures with precision from 0 to 700 bar gauge (10,000 psi)
The number of coarse pump cycles or turns of the fine volume adjuster required to reach a desired pressure, depends on the test volume connected to the pump. For example If the test volume is doubled
the number of cycles or turns will be doubled to achieve the same pressure change.
When testing a high pressure with a pneumatic hand pump it is essential to keep the test volume as small as possible. Also, winding out the fine adjustment screw as far as possible before applying any pressure will provide you with a convenient pressure booster when you or the pump runs out of steam at high pressures.
It is very difficult to set very low pressures with a small test volume due to the relatively large capacity of most calibration hand pumps. Increasing the test volume can help reduce the sensitivity of the coarse pressure pump, but alternatively using the fine volume adjuster for applying and incrementing the test pressure may produce the same results.
Featured calibration hand pump products
- PGS700 High Pressure Calibration Hand Pump - Hydraulic hand pump for applying test and calibration pressures with precision from 0 to 700 bar gauge (10,000 psi)
140 bar / 2,000 psi Hand Operated Air Pressure Test Pump – ADT919A - Generate air pressure up to 140 bar / 2,000 psi one handed.
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