Ralston Instruments May 2009
Email Newsletter
A Better Way to Calibrate Pressure Instruments With Nitrogen
Calibration Manifold
The Problem
Calibrating pressure instruments by filling and bleeding valves can cause pressure to jump around while trying to achieve a specific set point. Moreover, “Christmas trees” made from multiple valves and fittings are cumbersome and can lead to leaks. Calibrations performed with these configurations yield inaccurate results due to hysteresis error and waste valuable nitrogen.
The Solution
A better alternative to filling and bleeding valves is to change the volume of the system using a fine adjustment piston. Ralston Instruments calibration manifolds are a compact, complete solution that include the manifold, (with fine adjustment) hoses and adapters required to perform a successful calibration.
Calibration Manifolds
Using the Ralston calibration manifold, technicians can quickly reach test points required to perform static pressure calibrations without having to continually over-shoot and under-shoot to hit their target pressure. Our newly redesigned fine adjustment piston, along with precision fill and vent valves, provides improved control while decreasing effort and wasted nitrogen.
Benefits of the Ralston Calibration Manifold
Smoother control of pressure
Reduction in hysteresis error
Reduction in leaks
Greater accuracy
Conservation of nitrogen
Reduction of time
Ordering Information
Available in brass (QTCM manifolds – up to 3000 psi)
Available in stainless steel (QSCM manifolds – pressures to 5000 psi)
Make a complete kit by including a digital or analog pressure gauge
Ralston Takes to the Road
Trade Show
Check us out at these upcoming tradeshows:

Gillette Energy Exposition 2009
June 3-4 | Gillette, WY, USA
Calibration Technicians Booth 611

Tech Tip
Did you know that you should always check your batteries, hoses and adapters before you climb?
If you are calibrating in a tower make sure that your calibrator has plenty of juice, that you have enough hose and the right adapters to do the job.
Featured Products
10,000 PSI Hoses with Female Quick-test XT Hose Ends
10,000 PSI Hoses with Female Quick-test XT Hose Ends

Flexible, high pressure hose with finger-tight and bubble-tight connections to 10,000 psi

10,000 PSI Male NPT Quick-test XT Adapters
10,000 PSI Male NPT Quick-test XT Adapters

Connect to hand pumps, pressure sources and pressure transmitters to 10,000 psi

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