CO2 Analyser

The S157 CO2 Analyzer is a single channel non-dispersive infrared CO2 analyzer that measures CO2 in 0 to 2000 ppm range with 1 ppm resolution.  This CO2 Analyzer is ideal for CO2 exchange measurements with leaves, insects, small animals or organisms with a low metabolic rate. It is also excellent for measuring soil respiratory activity in the lab and field. The analyzer may be used in a flow-through gas exchange configuration for instantaneous and continuous measurements of CO2 exchange. It can also be used in stop flow or closed system modes for measurements at extremely low activity levels. The S157 CO2 Analyzer shares the same infrared technology and modular design as the S158 CO2 Analyzer.  The S157 CO2 Analyzer may also be used as part of Qubit Systems’ carbon dioxide control system for regulating pCO2 in growth cabinet. We recommend using S157 with our C950 Gas Exchange Software or other data acquisitions software.

Features :

  • Switchable ranges of 0 – 500 ppm and 0 – 2000 ppm CO2
  • 1 ppm carbon dioxide resolution on digital display
  • Non-dispersive infrared technology
  • Modulated infrared light source = no moving parts
  • 0 – 5 V analog output at both range settings
  • Optional battery pack for field use
  • Compact and portable
  • Weatherproof case

Applications :

  • Photosynthetic measurements
  • Respiration of roots and soil samples
  • Respirometry of insects and other invertebrates
  • Head space analysis of cell cultures
  • Atmospheric monitoring and control
  • Respiration of small amphibians


  • Operating principle:  Non-dispersive infrared
  • Gas sampling mode: Flowing gas stream, sealed chamber
  • Maximum gas flow rate: 650 mL/min
  • Measurement range (LCD display): 0 – 1999 ppm
  • Analog output, low sensitivity: 0 – 2000 ppm
  • Analog output, high sensitivity: 0 – 500 ppm
  • Accuracy: Better than ± 2% of full scale
  • Repeatability:    Better than ±1% of reading
  • Maximum drift: (per year)  ±100 ppm
  • Response time : (@ 250 mL/min; to 95% of final value) ca. 45 sec Warm up time (@ 22oC)   ca. 5 min
  • Output (linear) for Low Sensitivity setting: 0 – 5 VDC for 0 – 2000 ppm
  • Output (linear) for High Sensitivity setting: 0 – 5 VDC for 0 – 500 ppm
  • 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: 175 mA average, 450 mA peak
  • Dimensions: (cm)  (H x W x D: 25.4 x 10.2 x 15.2)
  • Weight: 2.2 kg
  • Warranty: 1 year limited

Specifications subject to change without notice


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  • Busi MV, Maliandi MV, Valdez H, Clemente M, Zabaleta EJ, Araya A, Gomez-Casati DF.  Deficiency of Arabidopsis thaliana Frataxin alters activity of mitochondrial Fe-S proteins and incudes oxidative stress.  The Plant Journal 48: 873-882 (2006)

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