The DCAP-PV pump from Ralston Instruments is said to generate pressure and vacuum easily and then control pressure to very precise test points. If the transmitter is an absolute pressure transmitter, the hand pump can generate a vacuum to reach below ambient pressure test points.
The Ralston Instruments Quick-test system of hoses and connectors also lets the user connect without thread tape to each adapter and in many cases also to the device being calibrated without a wrench.
For setting pressure switches, a pump with good control of pressure or vacuum is required.
The fine adjust piston on the hand is said to very precise and lets the user open or close a pressure switch easily. In addition, the hand pump works well for calibrating flow computers which require precise control of pressure to each side of the differential pressure cell, the company says.
The pump and hose need to have a low volume so that the user is not spending a lot of time compressing air just to fill a hose. If some test points are below ambient pressure the hand pump can be used to pull a vacuum.
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