Q-S102 O2 Analyzer
Q-S102 O2 Analyzer

Qubit Systems’ Q-S102 O2 Analyzer is configured for measuring oxygen concentration in a flow through gas exchange systems in 0-25% or 0-100% range with 0.21% accuracy. The O2 Analyzer also contains gas pressure sensor for measurements of total gas pressure at the O2 sensor. The Q-S102 O2 Analyzer is ideal for determining O2 uptake in organisms with high metabolic rates in an open flow system configuration. For organisms with low metabolic rate it can be used in a closed flow  system where the rate of O2 uptake can be calculated from the slope of O2 decline in the system.

The Q-S102 O2 analyzer requires data interface with two analog signal ports and software to operate.  We recommend our C610 LabQuest Mini data interface with C901 Logger Pro Software.  Q-S102  has been developed from the S102 Flow Through O2 Sensor and is a key component of the Q-Box Packages for research. The Q-S102 O2 Analyzer has a galvanic cell (a lead-oxygen battery) consisting of a lead anode, an O2 cathode, and an acid electrolyte.  It also incorporates an O2-permeable Teflon FEP membrane with a gold electrode bonded to its surface.  Oxygen diffusing through this membrane is reduced electrochemically at the gold electrode. A resistor and thermistor (for temperature compensation) are connected between anode and cathode.  The output of the instrument is proportional to the current flowing through the resistor and thermistor and this is proportional to pO2 in contact with Teflon membrane.

  • Switchable ranges of 0 – 25 kPa and 0 – 100 kPa O2
  • built in gas pressure sensor
  • galvanic cell technology
  • 0 – 5 V analog output at both range settings
  • Optional battery pack for field use
  • Compact and portable


  • Animal Respirometry
  • Human Respirometry
  • Atmospheric monitoring and Control
Operating principle   Acid Electrolyte, Teflon Diffusion Membrane
Detection Range  0-25% and 0-100 %O2 (Linear)
Resolution  ±40 ppm
Accuracy  ± 0.21% of Full Scale
Response Time (90%)  12 Seconds
 Calibration Two point
linear response  
Life Expectancy of sensor  3-5 years
Easy sensor replacement (Qubit offers replacement sensors)  
Influence by Other Gases  Ammonia and Ozone
CO2 friendly sensor  
min flow  5 mL/min
max flow  650 mL/min
Built in total gas pressure reading at the O2 sensor (for pressure correction in the software)  
Pressure Range  0.5 atm to 1.5 atm
Pressure Effect   Output voltage changes proportionally
Shock Resistant  to 2.7 G
Avoid strong vibration  
Operating Temperature  5 to 40oC (Effective range)
Passive temperature control of the O2 sensor  
Weight  1.35 kg
Dimensions (cm)  (H x W x D: 5.5 to 9.5 x 9.5 x 17)
Output  0 to 5 volt
Two ranges 0-25kPa, 0-100kPa
Power Supply  12 Volts
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  • Q-Box RP1LP Low Range Respiration Package,
  • Q-Box RP2LP High Range Respiration Package,
  • Q-Box NF1LP Nitrogen Fixation Package
  • Q-Box HR1LP Human Respirometry Package.


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