The Model 65 is a perfect low cost, high performance solution for measuring percent levels of oxygen in a variety of OEM applications when displays, alarms, and multiple ranges are not required or become redundant in your system design.

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The Model 65 employs a revolutionary long life zirconium oxide sensor lasting up to 10 years if used continuously and considerably longer if used intermittently. This eliminates the need to purchase, stock, frequently calibrate or replace the standard galvanic type oxygen sensors, greatly reducing overall costs.

This device uses state-of-the-art microprocessor based electronics for single range linear analog output. It provides unmatched stability and reliability even in rapid temperature swings from -4°F to +130°F.

The installation is simple, requires minimal space and a supply voltage of 12-28VDC.

It requires no support or calibration gases and is suitable for single range applications from 0-25%, 0-50% and 0-95% oxygen. Annual calibrations can easily be performed on ambient air or a suitable calibration gas.

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  • Single 0-25% range. Optional ranges available up to 0-95%
  • Output:
    0-2.5VDC for 0-25% and 0-50% ranges
    0-4.0 VDC for 0-95% range
    Option 4-20ma output available
  • Minimum detection:
    0.05% of range or 500ppm
  • Repeatability: 0.05% oxygen
  • Operating temperature:
    -4°F to 130°F (-20°C to 55°C)
  • Diurnal temperature specification:
    < 1% over temperature range
  • 90% response: < 12 sec
  • Power requirements:
    10-24 VDC, < 3 watts.
  • Area Classification: General purpose
  • Weight: < 1lb
  • Dimensions: 1.810"Dia. x 2.00

  • Choice of single measurement range;
    0-25%, 0-50% or 0-95%
  • Virtually unaffected by change in temperature
  • RFI protected
  • Linear long life zirconium oxide sensor
  • Rugged compact design
  • Unaffected by change in flow rate
    (.1 to 5.0 SCFH)
  • Weather-tight 4-pin interconnection
    connector, plus cable
  • Barbed sample gas in/out fittings
    (optional compression fittings)
  • No calibration or support gases necessary
  • 2 year warranty


  • 10-year life sensor
  • Low original cost and virtually maintenance free over its entire life
  • Requires no support or calibration gases (other than ambient air calibration)
  • No sensor replacement or shelf life issues
  • Unaffected by change in temperature from -4°F to 130°F (-20°C to 55°C)