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1
Introduction / General Information
1.1
Description
Thermal conductivity gauges measure pressure indirectly by
sensing the loss of heat from a sensor to the surrounding gases.
The higher the pressure of the surrounding gas, the more heat is
conducted away from the sensor. Pirani thermal conductivity
gauges maintain a sensor (usually a wire) at some constant tem-
perature, and measure the current or power required to maintain
that temperature. A standard Pirani gauge has a useful measur-
ing range of about 10
-4
Torr to 10 Torr. By taking advantage of
convection currents that are generated above 1 Torr, convection-
enhanced Pirani gauges increase the measuring range to just
above atmosphere.
The INFICON
®
PGE500 module provides the basic signal condi-
tioning required to turn a convection vacuum gauge into a com-
plete measuring instrument. This version of the PGE500 pro-
vides a DeviceNet interface as well as two process control set-
point relays. Additionally a built-in OLED digital display provides
the measured pressure values and provides for a convenient
user interface for setup and operation of the vacuum gauge. The
INFICON PGE500 module will also directly replace the
DeviceNet version of the Granville-Phillips® / MKS Mini-Convec-
tron® vacuum gauge as the electrical connector pin-out and
DeviceNet commands are identical to the corresponding Mini-
Convectron®.
Summary of Contents for 3PE5-001-B7HZ
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