Features
These capillary-type calibrated leaks use VTI's proprietary Positive Shut-Off (PSO) valves to provide instant on-off operation with essentially no dead volume. This eliminates any gas burst when the valve is opened. The valve's dead volume is only 0.0001 cc compared to as much as 1 cc or more in some valves. The PSO-valve Leaks also minimize gas depletion rates and provide longer life even at high flow rates. Their leak-rate control element is a crimped stainless steel capillary suitable for use with all gases.
The Positive Shut-Off Calibrated Leaks are available with an integral gas reservoir and can be provided with any gas. They are also available without a gas cylinder for use with an external gas source. Operation of the valve can be manual, pneumatic or electrical.
The unique features of these proprietary PSO Calibrated Leaks result in their use in a wide variety of applications. They are extensively used for verification tests and calibration of Leak Testing Systems, usually with automated valve operation and usually with an external gas source rather than a reservoir. They are also used frequently to flow gas at a controlled rate into a process chamber or research apparatus, or to "dope" another gas stream. For mass spectrometer analysis of gases that are at high pressures, the PSO-valve Leaks are used to reduce the pressure and provide a sample rapidly with no gas burst.
VTI has also developed a Mass Spectrometer Calibrator using the PSO Calibrated Leak and a reservoir of mixed gas (3% Helium, Krypton, Xenon and Hydrogen, 1.8% Nitrogen and 86% Argon). This Mixed-gas Calibrator provides a convenient and accurate way to tune the peak position and height for masses ranging from 1 to 132 amu. The low dead volume of the valve eliminates any gas burst into the system and conserves the gas mix, thus providing a long operational lifetime.
Choosing the PSO Calibrator
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