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LuminOx Flow-through Optical Oxygen Sensor


The LuminOx Flow-Through Optical Oxygen Sensor Allows For A Clean Gas Sample Stream Directly Into The Sensor Which Can Be Completely Removed From The Process Environment.
The LuminOx Flow-through Optical Oxygen Sensor is developed and manufactured by SST, it is part of the LuminOx family, which is a range of factory calibrated oxygen sensors which measure ambient oxygen levels using the principle of fluorescence quenching by oxygen, also known as luminescence quenching.

The LuminOx Flow-through Optical Oxygen Sensor (LOX-02-F) is an extension to the standard range of LuminOx oxygen sensors. The original LOX-02 sensor was designed to be completely immersed in the sample gas environment as the base of the sensor is not gas-tight.

The flow-through housing style is sealed on the base which allows for a clean gas sample stream into the sensor which can be completely removed from the process environment. A flow-through housing allows for better sample gas management and options in terms of where the sensor can be situated.

The patented technology allows SST to produce a range of sensors that are based on a non-depleting operating principle. This can contribute to the LuminOx sensors having a comparably longer lifetime that other competitor technologies, such as galvanic sensors, for similar applications.

The LuminOx oxygen sensors each have an internal sensor for temperature and barometric pressure compensation, meaning the customer does not need to consider this in their design. It also communicates directly to the customer’s USART so no signal conditioning circuitry is required.

LuminOx is a completely solid state sensor and contains no lead or liquid electrolytes. It is therefore 100% RoHS compliant. It also has virtually no cross sensitivity, allowing it to be used in applications where other technologies are unreliable due to the particular mix of gases present.

The luminescence quenching principle measures the partial pressure of oxygen (ppO2). The internal barometric pressure sensor measurement along with ppO2 measurement allows an oxygen concentration (O2%) value to be calculated. The USART output allows the sensor to communicate the values of O2%, ppO2, barometric pressure, internal temperature and a sensor status.


Part Numbering Guide


Supply Voltage (Vs)  4.5 to 5.5Vdc
Supply Current (Is)
Output Type 3.3V TTL level USART
Temperature Limits
    Operating -30 to +60°C
    Storage -30 to +60°C
Humidity 0-99% Rh (non condensing)
Barometric Pressure Range 500-1200mbar
Maximum Flow Rate 1.0 litre/min


Oxygen Range (LOX-02) 0-25% O2
Oxygen Pressure Range 0-300mbar ppO2
Response Time T90
    Temperature Indication only
    Pressure     +/- 5 mbar
    O2 Determined by ppO2 &

pressure accuracy

    ppO2 0.1mbar
    Temperature 0.1°C
    Pressure     1mbar
    O2 0.01%
Lifetime > 5 years



Pin Designation
1 Vs (+5V)
2 GND (0V)
3 3.3V USART Sensor Transmit
4 3.3V USART Sensor Receive


  • Luminescence-based optical technology, NOT electrochemical
  • Flow-through housing with sealed base
  • Factory calibrated
  • Measures temperature and pressure (if selected)
  • Extended temperature range
  • Maintenance free
  • Battery power usage
  • No need for additional electronics
  • Compact in size


  • Long life, non-depleting technology
  • Additional integration options due to the flow-through and sealed housing
  • Low power
  • Fast response
  • High accuracy
  • Low cost
  • RoHS compliant
  • Connects directly to a microcontroller without needing any circuitry
  • Contains no hazardous materials
  • Full technical and application support available
  • This field is for validation purposes and should be left unchanged.