S159 CO2 and O2 Analyzer

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S159 CO2 and O2 Analyzer

The S159 CO2 and O2 Analyzer is a combination of a flow-through non-dispersive infrared CO2 analyzer, a galvanic cell O2 sensor and a built in pressure sensor. These three independent sensors are housed in series inside a rugged, temperature-controlled case.  The CO2 analyzer may be customized to different ranges from ppm to % and its resolution will depend on the range. The O2 analyzer provides measurements in 0-25% range with resolution of ±40ppm.  The pressure sensor measures absolute pressure at the O2 sensor and this measurement is used in software to correct the O2 signal for any changes in pressure of the system.  The range of CO2 sensor in this analyzer is determined by the application.  This can vary from respirometry of small animals like insects to large animals like seals or environmental monitoring of indoor and outdoor settings.  The S159 is a flow through analyzer and gas needs to be delivered to the sensors under pressure. Therefore, S159 can be purchased as a stand-alone analyzer or with a built-in gas pump (S159-P).  For some applications a flow monitor 0-1 or 0-2LPM may also be included (S159-PF).  The S159 CO2 and O2 analyzer is housed in a temperature controlled rugged case for better signal stability, making it ideal for field use with an optional battery pack.  Three analog outputs of 0-5V are available from the S159 (CO2, O2 and Pressure).  The S159 CO2 and O2 Analyzer requires data interface and software to collect and display data.  We recommend using Qubit Systems’ supplied data interface and software (optional) but other data acquisition systems may also be used.

  • Non-dispersive infrared CO2 sensor
  • Galvanic cell O2 sensor
  • User specified CO2 range (ppm or %), 0-25% O2 range
  • Built in gas pressure sensor
  • Temperature control of the rugged case
  • Three 0 – 5 V analog outputs
  • Available with built in sub-sampling gas pump (S159-P)
  • Available with built in gas pump and mass flow monitor (S159-PF)
  • Compact and portable
  • Weatherproof rugged case
  • Optional battery pack for field use
  • Optional data interface and software
  • 1 year warranty
  • Respirometry of insects, other invertebrates and small animals (CO2 in ppm range)
  • Respirometry of mammals, birds, humans (CO2 in % range)
  • Head space analysis of cell cultures
  • Atmospheric monitoring and control
  • Gas control of chambers and growth cabinets
  • Analysis of gas samples in injection mode
  • Operating principle:  Non-dispersive infrared CO2 sensor and Acid Electrolyte, Teflon Diffusion Membrane O2 sensor
  • Maximum gas flow rate: 650 mL/min
  • Measurement range user specified for CO2 (ppm or %) and 0-25% O2
  • Pressure Sensor – monolithic silicon, range 15-115KPa
  • Accuracy: Better than ± 0.1% of full scale for CO2 and 0.21% for O2
  • Response time : (CO2 = 30 sec to 95% of final value @ 250 mL/min; O2 = 12 sec)
  • Warm up time (@ 22oC)   ca. 15-30 min for CO2 sensor, no warm up for O2 sensor required
  • Three analog outputs  0 – 5 V, CO2, O2, Pressure, Flow (S159-PF)
  • Two point linear calibration of CO2 and O2 sensors
  • O2 sensor life expectancy: 3-5 years
  • Easy O2 sensor replacement
  • Calibration adjustments :   Zero and Span
  • Operating temperature range: 0 to 50oC
  • Storage temperature range:  -40 to 70oC
  • Operating pressure range: ±1.5% local mean pressure
  • Humidity range: 5 to 95% RH, non-condensing (recommend drying gas stream)
  • Pressure dependence:  +0.19% reading per mm Hg
  • Power requirements: 12 VDC via 120 VAC/60 Hz adapter
  • Current requirements: 275 mA average, 1.3A heater
  • Dimensions: (cm)  (H x W x D: 17 x 40 x 30)
  • Weight: 4.7 kg
  • Warranty: 1 year limited
S159 Co2 and O2 analyzer closeup
S159 CO2 and O2 analyzer back conections


“I am using one of your CO2 monitoring systems for atmospheric CO2 measurements, successfully and continuously since 2010 and would like to thank you for manufacturing such a reliable instrument. “

Dr. A. Cemal Saydam, Hacettepe University, Turkey

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