美国Granville-Phillips 307系列B-A真空计控制器：
The Series 307 Vacuum Gauge Controller (VGC) measures pressure, and utilizes pressure-related outputs to control a variety of vacuum system functions and processes. To fi t a wide range of needs and applications, the 307 VGC is available in a variety of confi gurations and prices. In its simplest form the 307 VGC runs a single ionization gauge (IG) in the range from 1 x 10-10 to 1 x 10-1 Torr. With available modules the 307 controls four gauges, measuring pressure from 2 x 10-11 Torr to atmosphere, and six process control setpoints.