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Zirconia Oxygen Sensor System

Zirconia System

Zirconia Oxygen Sensor System
  • Zirconium dioxide (ZrO₂) oxygen sensor with the OXY-LC interface board
  • Long life, non-depleting technology
  • Integral heating element
  • High accuracy
  • Linear output signal


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Supply voltage
    R485 output variant 8-28Vdc
    Analogue output variants 20-28Vdc
Supply Current 600mA max. at 24Vdc
1.2A max. at 12Vdc
Digital Output RS485 (Modbus RTU)
Analogue Output 4-20mA; load 600Ω max
or 0-10V; load 10kΩ min
Pump impedance at 700⁰C¹
Permissible gas temperature -100 to 250⁰C
Gas flow rate² 0-10m/s
Operating pressure limits³ 260-1260mbar absolute
Mounting thread M18x1.5


Oxygen range (analogue output) 0.1-25% O₂ br>
or 0.1-100% O₂
Oxygen range (Modbus RTU) 0.1-100%
Accuracy after calibration 0.5% O₂
Output resolution 0.01% O₂
Response time
Initial warm up time (until stable output) 5-10 mins
Output inactive start up delay (heater warm up):
    From OFF to ON mode: 60s
    From standby to ON mode (RS485 only): 20s


Sensor Layout


Interface Board Layout


¹The constant current source used in the pump circuit should be designed to drive a load of up to 6kΩ.
²With baffle fitted to shield the sensor from direct cooling and pollution by the flue gas; refer to Screwfit Zirconia Oxygen Sensor Datasheet for fitment details.
³Sensor and interface for correct barometric pressure compensation.



Pin RS485 Analogue
1 Sensor heater + (1) Sensor heater + (1)
2 Sensor heater 0Vdc (2) Sensor heater 0Vdc (2)
3 Sensor pump Sensor pump
4 Sensor common Sensor common
5 Sensor sense Sensor sense
6 8-28Vdc 20-28Vdc
7 0Vdc 0Vdc
8 RS485 A (+) 4-20mA or 0-10Vdc
9 RS485 B (-) Calibrate IN/PWM OUT


  • Zirconium dioxide technology
  • Interface electronics included
  • Integral heating element
  • Variety of probe mounting positions available; 28mm, 45mm & 55mm
  • M18x1.5 screw mounting
  • All stainless steel construction both internally and externally


  • Long life
  • No reference gas required creating the ability to measure a wide oxygen range
  • Non-depleting technology
  • Linear output signal
  • No need for temperature stabilisation
  • 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.