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Probe Zirconium Dioxide Oxygen Sensors

The Probe zirconium dioxide oxygen sensors are available in three lengths. Suitable for aggressive and polluted applications such as boiler exhausts. Longer probes are an ideal solution for thicker walled, insulated flue pipes.

SST’s range of zirconium dioxide oxygen sensors use a unique closed loop measurement system. While the sensor continuously measures the oxygen level, a heartbeat signal is also generated providing an immediate warning of any failures.

Their long operating life is due to the non-depleting sensor cell technology. No reference gas is required and easy single point calibration can be performed in any known gas including fresh air.

The Probe zirconium dioxide oxygen sensors offer standard and fast response times from as little as four seconds. Various probe lengths, cable lengths, and a standard and extended temperature range are available. The Probe zirconium dioxide oxygen sensor offer a linear output signal, a lifetime of up to 10 years (depending on the application), and covers an oxygen range from 0.1 to 100% O₂.

All of SST’s zirconia oxygen sensors require interface electronics to operate which SST can provide (see related products below). For high volume applications, we can work with you to design your own electronics, saving you time and money.


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Part Numbering Guide


Heater voltage
    Operating (standard response) 4Vdc +/- 0.1Vdc (1.7A)
    Standby 1.65Vdc (0.7A)
    Operating (fast response) 4.35Vdc +/- 0.1Vdc (1.85A)
    Standby 2Vdc (0.85A)
Pump impedance at 700°C
Permissible gas temperature
    Standard temperature (short probe series) -100 to +250°C
    Extended temperature (long probe series) -100 to +400°C
Gas flow rate 0-10 m/s
Repetitive permissible acceleration 5g
Incidental permissible acceleration 30g


Oxygen pressure range 2mbar-3bar max.
Accuracy 5 mbar max.
Internal operational temp 700°C
Response time (10-90% step)
    Standard response sensor
    Fast response sensor (only available in short probe series)
Warm up time (prior to sensor operation) 60s
Warm up time (from standby) 20s
Output stabilisation time ~ 180s


Probe – Short Series


Probe – Long Series



Molex Mating Connector (Short Probe)


Pin/Lead Wires Designation
1/Red Pump
2/Black Common
3/Yellow Heater (+)
4/Blue Sense
5/Yellow Heater (-)


  • Zirconium dioxide technology
  • Requires remote electronics to operate
  • Small sensing element
  • Low weight
  • Integral heating element
  • All stainless steel construction both internally and externally
  • Customer specific designs and connectors
  • Works at high oxygen pressures
  • Compact in size


  • Long life, non-depleting technology
  • No reference gas required creating the ability to measure a wide oxygen range
  • No need for temperature stabilisation
  • Linear output signal
  • Can be used in high pressure and temperature environments
  • Simple recalibration if/when required
  • Full technical and application support available
  • This field is for validation purposes and should be left unchanged.