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OXY-LC Oxygen Sensor Interface Electronics

The OXY-LC Oxygen Sensor Interface Electronics provides the necessary electronics to power and control SST’s range of zirconium dioxide (ZrO₂) sensors.

The OXY-LC Oxygen Sensor offers various user configurable output variants RS485, PWM, 0-10Vdc and 4-20mA. The RS485 Modbus RTU Protocol offers various benefits over other output types but most importantly it allows complete control of the sensor operation and access to all available information including sensor diagnostics, barometric pressure and pressure sensor temperature.

The adaptive software filtering which enables it to provide a fast response coupled with a stable oxygen output. In addition to this, the OXY-LC Oxygen sensor interface electronics offers a high accuracy linear output for all of our zirconium dioxide oxygen sensors.

The built in pressure sensor allows for barometric pressure compensation and the interface mounted screw terminals offers easy wiring with reverse voltage and transient overvoltage.

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Part Numbering Guide


Supply voltage
    RS485 variant 8 to 28Vdc
    Analog variant 20 to 28Vdc
Supply current 600mA max. at 24Vdc
1.2A max. at 12Vdc
Digital output RS485 (Modbus RTU) OR
Analog output 4 to 20mA; load 600Ω max. OR
0-10Vdc; load 10kΩ min.
Temperature limits
    Storage -40 to 85⁰C
    Operating -30 to 70⁰C
Operating pressure limits¹ 260 to 1260mbar absolute/td>


Oxygen range (analog output) 0.1² to 25% O₂ OR
0.1² to 100% O₂
Oxygen range (Modbus RTU) 0.1² to 100% O₂
Accuracy after calibration³ 0.5% O₂
Repeatability after calibration 0.5% O₂
Output resolution 0.01% O₂
Response time (step 10 to 90%)
    Fast response sensor connected 4s
    Standard response sensor connected 15s
Initial warm up time (till stable output) 5 to 10 mins
Output inactive start up delay (heater warm up)
    From OFF to ON mode 60s
    From standby to ON mode (RS485 only) 20s



¹Sensor and interface for correct barometric pressure compensation.
²Prolonged operation below 0.1% O₂ can damage the sensing element.
³Analog output variants accuracy stated is valid wen calibration at the default calibration value. RS485 variant accuracy stated is valid when calibrated at the default 20.7% O₂ over the range 0.1 to 25% O₂. For maximum accuracy above 25% O₂ the interface and sensor should be calibrated to full scale of the required range using certified gas.


OXY-LC-Board Original

Pin Assignment
RS485 Variant Analogue Variants
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 to 20mA or 0 to 10Vdc
9 RS485 B (-) Calibrate IN/PWM OUT


  • Allows quick and easy evaluation of the LuminOx sensor with minimum effort and/or design work
  • Interface screw terminals for easy wiring
  • The interface provides one output; RS3223, voltage or current


  • Converts the LuminOx TTL level RS232 output into three standard industrial outputs/li>
  • Auto detects ppO₂ or O₂% variants of LuminOx sensor
  • This field is for validation purposes and should be left unchanged.