Granville-Phillips 340 Vacuum Gauge Controller (VGC) measures pressure from less than 1 x 10-9 Torr to atmosphere, utilizing an ionization gauge and two Convectron gauges.

Bayard-Alpert Design and Dual Tungsten or Burn-out Resistant Iridium

The Granville Philips Convectron Gauge tube used on the 5971 and 5972 mass spectrometers is available from S.I.S. This is a direct replacement for the HP original and screws into the fitting shown above.

A complete line of Brass and Stainless Steel Fittings for GC, MS and general laboratory use.

The Granville-Phillips Model 330 Ionization Gauge Controller is reliable, easy to operate, easy to service and moderately priced.

The vacuum measurement system to monitor the source pressure is optional for the 5971.