The 943-A-220V50-TR-PC Digital Controller for Cold Cathode Vacuum Gauges features a Torr unit readout, and requires 200 to 240 VAC, 50 Hz power. The 943 Vacuum Gauge Controller uses a high visibility LED display. An internal converter provides output that allows a simple log conversion from voltage to pressure over the entire operating range. And a fast responding, buffered analog output is also provided through the 15 pin accessory connector on the rear panel. The 943 digital controller features two standard independent relay set points, which allows you to confidently control your process. Adjust the set points from the front panel while viewing the display. Red LEDs indicate set point activation status. Front panel functions allow the user to disable the high voltage, as well as set a pressure at which the cold cathode will automatically turn off. This prevents the controller from displaying incorrect readings when the pressure goes above the operating range of the sensor.