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Vacuum Measurement
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Q: Why use a Bourdon gauge?
A: A Bourdon gauge offers a quick visual check of the vacuum status of a chamber prior to opening a door to the chamber.
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Q: What does "not rated for oxygen service" mean?
A: The Bourdon gauges are not cleaned for use with gaseous oxygen. It is not a matter of incompatible materials since all internal materials are oxygen compatible. But, it cannot be used with pressurized oxygen. Note that all MDC vacuum components and chambers are rated for vacuum service and should never be internally pressurized.
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Q: How can I identify the type of filament on my nude ionization gauge tube?
A: The replaceable is either a thoria coated iridium filament or a tungsten filament. Iridium filaments are smooth silvery ribbons while tungsten filaments are a curly grayish wire.
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Q: What is the difference between a four-pin and an eight-pin thermocouple gauge tube?
A: Generally, for all thermocouple gauge tubes the pin out patterns employ four active pins. Two of the pins supply current to the heater inside the gauge head and two of the pins provide a return signal which is dependent on pressure inside the vacuum vessel. In the case of gauge tubes having eight pins, four of the pins are active and the other four are used for support only.
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Back to Product FAQ Summary
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