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This is a Varian CDG-500 capacitance diaphragm gauge, 1000 Torr range, with two setpoint relays. The system connection is a KF-16 flange.

Our price: $800


As received by us, this gauge was in the box shown, with the protective plastic cap in place on the flange. The box showed some wear from handling, and had some scribbling on one face as shown in the pictures. The gauge appeared to be new, with no signs of ever having been put into service. The serial number on the gauge is the same as what appears on the label on the box. Cosmetic condition of the gauge is excellent. Flange sealing surfaces and interior surfaces appear to be immaculate.

This gauge was tested on a clean, turbomolecular pumped system, and appeared to function correctly. The output signal varied smoothly and continuously from atmosphere down to high vacuum, and pressure readings correlated sensibly with those from a convection-enhanced Pirani gauge in operation on the system. The setpoint relays were adjusted to 100 Torr for Setpoint 1, and 200 Torr for Setpoint 2, and found to function correctly during pump-down.

  • Varian part number CDG500T1000KF16S
  • measurement range (full scale): 1000 Torr
  • required supply voltage: 14 to 30 VDC
  • analog output signal: 0-10 VDC, linear with pressure
  • two process control setpoint relays
  • KF-16 flange
  • RS-232C interface

  • accuracy: 0.2% of reading
    (non-linearity, hysteresis, repeatability at 25C ambient operating temperature without temperature effects after 2 hours operation)
  • Temperature effect on zero: 0.005% of full scale /C
  • Temperature effect on span: 0.01% of full scale /C
  • Resolution: 0.003% of full scale

  • maximum pressure: 400 kPa (absolute)
  • lowest reading: 0.01% of full scale
  • lowest suggested reading: 0.05% of full scale
  • lowest suggested control pressure: 0.05% of full scale

  • ambient temperature for operation: 5 to 50 C
  • bakeout temperature (at flange; non operating): ≤110 C

  • setpoint relay contact rating: 30 VDC; ≤0.5 A
  • setpoint hysteresis: 1% of full scale

Click on any picture below to view a larger, higher-resolution version.