Measurement and Testing

  • Hand pump makes pressure and vacuum calibration and testing faster

Hand pump makes pressure and vacuum calibration and testing faster

Mar 05 2019 Read 331 Times

Calibrating pressure transmitters in the field requires a hand pump that can generate pressure and vacuum easily and then control pressure to very precise test points. The majority of pressure transmitters are differential pressure or DP so the user must calibrate both the high and low side of the DP cell. This means the fine adjust control must be precise at 12 kPa as well as 3.5 MPa. The pump needs to be easy to use as most calibration technicians will calibrate quite a few transmitters each day. The Ralston DCAP-PV pump offers an excellent solution to these problems. If the transmitter is an absolute pressure transmitter the DCAP-PV can generate a vacuum to reach below ambient pressure test points.

The DCAP-PV hand pump allows the user to control pressure or vacuum very easily and move through their tests without worrying about leaks when calibrating gauges. Hoses and adapters are often the source of leaks during testing. To eliminate that the Ralston Quick-test system of hoses and connectors lets the user connect without thread tape to each adapter and in many cases also to the device being calibrated without a wrench. As technicians in the lab, in plants or on pipelines often have many gauges to calibrate or verify they need a tool to do the job quickly so they can move onto the next gauge.

Setting pressure switches requires a pump with good control of pressure or vacuum. The fine adjust piston on the DCAP-PV is very precise and lets the user open or close a pressure switch easily. This helps the technician get the job done faster. Often a technician will actuate a pressure switch multiple times to ensure it is working correctly and the DCAP-PV pump allows the user to do this with ease.

The DCAP-PV pump works well for calibrating flow computers which require precise control of pressure to each side of the differential pressure cell. 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. The connections on most flow computers can be accessed with Ralston Quick Connect adapters without thread sealant. If some test points are below ambient pressure the DCAP-PV pump can be used to pull a vacuum.

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