These Pfeiffer PKR 251 Compact FullRange™ Pirani/Cold Cathode Gauges provide measurable vacuum pressure in the range 100 to 5x10-9 Torr. The vacuum pressure can be displayed via a DCU or TCP 350 turbopump controller or via the TPG 261, 262, or 256 Active Gauge controllers. They have a DN 40 CF-F (CF 2.75 inch)connection flange. If integrated into an OEM system they requires 15 to 30 VDC power input and produce a linear 0-10 VDC analog output signal. They include overrange, underrange, sensor ID, and sensor error indication. These PKR251 compact full range gauges are FPM sealed and are qualified for a high 150°C bakeout temperature. This pricing is for the Pfeiffer SingleGauge™ PKR 251 Active Gauge only. All Pfeiffer controllers and signal cables sold seperately on this website. For complete operating instructions scroll down to (AVAILABLE DOWNLOADS) below and download the PDF's.