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Change
of pressure in vacuum systems brings about a rise or
fall in number of gas molecules present and hence a rise
(or) fall in the thermal conductivity of the gas. Thus
the heat loss of constant voltage electrically heated
filament in the system varies with the pressure.
The Pirani Gauge head filament has high temperature
co-efficient of resistance. So a slight change in system
pressure brings about useful change in filament
resistance resulting in an out of balance voltage which
can be read as a pressure on meter. The Pirani Gauge
head indicates the total pressure of combined gases and
undesirable vapors in the system on the thread wire can
loss heat to both gas and vapor molecules.
This Pirani Gauge instrument with two sensors having
wide range of applications, in high vacuum systems where
one sensor is used to measure backing vacuum and the
other sensor can be used for measuring high vacuum.
Pirani Gauge instruments can
be used in high vacuum systems, coating units,
sputtering units, and many other applications where
vacuum to be measured in the range of 0.9 to 0.001 m.bar.
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