LuminOx Flow-through Optical Oxygen Sensor

The LuminOx flow-through optical oxygen sensor allows a sample stream of clean gas to be taken directly into the sensor, which can then be removed from the process environment.

Developed and manufactured by SST and part of a range of factory calibrated oxygen sensors known as the LuminOx family, the LuminOx flow-through optical oxygen sensor measures ambient oxygen levels using luminescence quenching. This is also known as fluorescence quenching by oxygen.

The LuminOx flow-through optical oxygen sensor (LOX-02-F) is an addition to the LuminOx range of oxygen sensors. As the base of the first LOX-02 sensor was not gas-tight, it was designed to be completely immersed in the sample gas environment.

In order to allow for a clean gas sample stream into a sensor which can be removed from the process environment, the flow-through housing style is sealed on the base. The flow-through housing provides better management of sample gas as well as further options for choosing where to situate the sensor.

SST can produce a series of sensors based on the non-depleting operating principle using this patented technology. As a result, LuminOx sensors have a longer lifetime than comparable competitor technologies, for similar applications, for example, galvanic sensors.

Containing two additional internal sensors to measure barometric pressure compensation and temperature, customers do not need to consider their inclusion in their designs when using the LuminOx oxygen sensor. As it directly communicates to the customer’s USART, no additional signal conditioning circuitry is necessary.

Containing no lead or liquid electrolytes, the LuminOx sensor is a completely solid-state sensor, and so is 100% RoHS compliant. In addition, it has practically no cross sensitivity, meaning it can be used in applications where other technologies are less reliable as a result of the mix of gases present.

Combining the partial pressure of oxygen (ppO2) measured by the luminescence quenching principle alongside the internal barometric pressure measurement, the oxygen concentration value (O2%) can be calculated. The measured values of barometric pressure, O2% and internal temperature, as well as the status of the sensor can be communicated using the USART.


  • Luminescence-based optical technology, NOT electrochemical
  • Factory calibrated
  • Sealed base with flow-through housing
  • Wide temperature range
  • Battery power usage
  • No maintenance
  • No additional electronics required
  • Compact in size


  • Multiple integration options using the flow-through and sealed housing
  • Low power
  • Non-depleting, long life technology
  • Rapid response
  • High accuracy
  • RoHS compliant
  • Low cost
  • Connects directly to a microcontroller – no circuitry required
  • Full technical and application support
  • Contains no hazardous materials

Technical Specifications

. .
Supply Voltage (Vs) 4.5 Vdc to 5.5 Vdc
Supply Current (Is) <7.5 mA (streaming one sample per second)
<20 mA Peak
Output Type 3.3 V TTL level USART
Operating Temperatures -30 to +60 °C
Storage Temperatures -30 to +60 °C
Humidity 0-99% Rh (non condensing)
Barometric Pressure Range 500-1200 mbar
Maximum flow rate 1.0 liter/min


Outline Drawings

Output Values

. .
Oxygen Range 0-25% O2
Oxygen Pressure Range 0-300mbar ppO2
Response Time T90 <30 s (typical)
Accuracy -
ppO2 <2% FS
Temperature Indication only
Pressure ±5 mbar
O2 Determined by ppO2 & pressure accuracy
Resolution -
ppO2 0.1 mbar
Temperature 0.1 °C
Pressure 0.01%
O2 1 mbar
Lifetime >5 years


Electrical Interface

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

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