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 192 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.

Reader comments

Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.

Post a Comment




Digital Edition

Petro Industry News May 2019

May 2019

In This Edition Analytical Instrumentation - Range of viscometers for oils and fuels - Tackling viscosity measurement at refineries - Krebs stormer digital viscometer Fuel For Thought...

View all digital editions

Events

Safety & Health Expo

Jun 18 2019 London, UK

Atlantic Canada Petroleum Show

Jun 18 2019 St John's, Newfoundland

OGA 2019

Jun 18 2019 Kuala Lumpur, Malaysia

Valve World Americas

Jun 19 2019 Houston, Tx, USA

View all events