Ralston Instruments March 2009
Email Newsletter
Solving Differential Pressure Calibration Challenges
QTVC Volume Controllers
Performing differential pressure calibration is challenging for a variety of reasons.
As a world-renowned manufacturer of pressure calibration equipment, Ralston Instruments anticipates these situations and has created products that stand up to each challenge.

Precise control is difficult at very low pressures: The unique design of our fine adjustment control pistons allow the user to precisely control pressure, even at very low pressures. The QTVC volume controller has the finest control and provides most adjustment of any volume controller on the market.
Sudden changes in temperature can greatly affect pressure: Because our hand pumps, volume controllers and hoses are silver in color they reflect the sun and resist temperature change.
Too many connections: Designed for their adaptability and flexibility, both Ralston hand pumps and volume controllers have multiple outlet ports. This design feature eliminates the need for a tee and additional hoses which helps reduce sources of leakage.
Slight movements in the calibration setup can cause pressure to change and affect the accuracy of the readings: Because our hoses are extremely stiff, the inner diameter does not change even when part of the calibration set up is moved slightly. This design feature keeps the pressure stable, ensures an accurate reading and gives you peace of mind.
Learn more about our products:
For differential pressure testing down to 1 In H2O – DP0V and DPPV hand pumps
For both differential pressure testing down to 0.01 In H2O as well as static pressure testing to 3000 psi – QTVC Volume Controller
Ralston Takes to the Road
Trade Show
Check us out at these upcoming tradeshows:

Calgary ISA Show 2009
April 22-23 | Calgary Alberta, Canada
Cameron Instruments Booth

Offshore Technology Conference (OTC 2009)
May 4-7 | Reliant Center
Houston, Texas | USA | Booth 10504

ISHM 2009
May 12-14 | Cox Center
Oklahoma City, Oklahoma USA

Tech Tip
Did you know that you can tell if a hand pump or nitrogen control device is leaking by adjusting the fine adjust piston?
When you turn the piston clock-wise you increase the pressure and also the temperature. As the gas or liquid inside cools the pressure will drop. If you see the pressure dropping turn the piston counter-clockwise. If the pressure drops and then goes back up (due to the gas or liquid cooling) then there is no leak. If the pressure continues to drop you have a leak.
Featured Products
Digital Test Gauges
Digital Test Gauges

An excellent and reliable test gauge can be added to any pressure pump or gas control device to make a complete kit.


Hose and adapter kits
Hose and adapter kits

If you are adding a new technician or need replacements we can create a custom kit of your most commonly used hoses and adapters.


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