This is a MKS Granville Phillips Process Control Module and provides the 307 Vacuum Gauge Controller with single-pole, double-throw relays that may be controlled either by (2 digital setpoints) or by the built-in manual override switches. This Process Control Module has 2 user selectable channels. These 2 channels are assigned to the ion gauges. Switches are provided to assign channel 1 to IG1, IG2, or both; and likewise for channel 2. All two channels have selectable polarity for activation above or below the setpoint. For Process Control Card (module) installation procedures see pages 16-27 of instruction manual.pdf. For specs and procedures for use, see Chapter 5 of the instruction manual. This is the Process Control Module (2 set points) ONLY, MKS Granville Phillips 307 Controller, Cables and Accessories sold separately on this website. The MKS Granville Phillips 307 Vacuum Gauge Controller Instruction Manual.pdf can be downloaded below at DOWNLOADS: