Analytical instrumentation in hazardous environments via static pressurization
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United States of America Patent
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Apr 14, 2015
Grant Date -
May 1, 2014
app pub date -
Oct 29, 2013
filing date -
Oct 30, 2012
priority date (Note) -
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Abstract
An analytical instrument suitable for a use in a variety of industrial environments features a housing having a sealed primary chamber filled with a dry, inert gas at a first static pressure. An instrumentation system is disposed within the primary chamber, where fire hazard is eliminated by the inert gas. The housing additionally includes a reference chamber holding a gas a second pressure lower than the first pressure. One or more pressure switches, in pressure-sensing relationship with both chambers, is operative to interrupt the application of power to the instrumentation system if the differential between first and second pressures falls below a predetermined value. In this manner, the instrumentation system is rendered safe whenever the primary chamber is breached or otherwise loses inert gas pressure.
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