8
Doc. Ref. XGC-320-100119
V100 (2019-11)
1
Introduction / General Information
1.1
Description
The XGC-320 vacuum gauge controller is a convenient and inex-
pensive power supply and readout instrument for the Ideal
Vacuum Products XactGauge
TM
XGS-321 Convection-Enhanced
Pirani Sensor Gauge or a Granville-Phillips® 275 Convectron®.
The 1/8-DIN housing can be used as a bench top, or mounted in
a cutout in an instrument panel. The XGC-320 is powered by
user supplied 12 to 28 V (dc), 2 W, or by the Ideal Vacuum
Products power supply.
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 XGC-320 signals and relay functions are the same as found
on similar convection gauge controllers from other manufactur-
ers. The XGC-320 Controller, XGS-321 vacuum gauge tube and
gauge cable can be directly interchanged with MKS Instruments
/ Granville-Phillips® (GP) 375 or 475 controller, 275 Convec-
tron® gauge and gauge cable (Remote interface, relay and pow-
er connectors are different). Various analog output scaling pro-
vide signal compatibility with GP controller series 375, 475, the
original GP 1/4 DIN 275 Analog Convectron Gauge Controller as
well as the Mini-Convectron® module.