Q-S151 CO2 Analyzer 0-2000ppm

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Qubit Q-S1511

Q-S151 Infrared CO2 Analyzer is a non-dispersive infrared CO2 analyzer that measures CO2 in 0 to 2000 ppm range with 1 ppm resolution. Dependable technology is rugged and modular for an easy fit in our Q-Box Packages or for stand-alone use. Q-S151 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 situ in the field and in the lab.

This CO2 analyzer may be used in a flow-through system configuration for instantaneous and continuous measurements of CO2 production or consumption. It can also be used in a closed system mode for measurements at extremely low activity levels.

This Q-S151 CO2 analyzer may be set up for use in the injection mode where small samples of CO2 gas are injected into a carrier gas flowing past the CO2 sensor for measurements of CO2 levels in the headspace of collected samples.

The Q-S151 is a key component of Qubit Systems’ carbon dioxide control system for regulating pCO2 in growth cabinet or rooms.

  • Switchable ranges of 0 – 500 ppm and 0 – 2000 ppm CO2
  • 1 ppm CO2 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
  • Photosynthetic measurements
  • Respiration of roots and soil samples
  • Respirometry of insects and other invertebrates
  • Head space analysis of cell cultures
  • Atmospheric monitoring and control
  • 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 – ± 1 ppm
  • Repeatability (at stable atm press and temp)- Better than ±1 ppm
  • Maximum drift (per year) – ±100 ppm
  • Response time (@ 250 mL/min; to 95% of final value) – ca. 25 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 – 125 mA average, 450 mA peak
  • Dimensions (cm) – (H x W x D: 5.5 to 9.5 x 9.5 x 17)
  • Weight – 1kg
  • Warranty – 1 year limited
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  • Y.P. Cen and D. B. Layzell. Does oxygen limit nitrogenase activity in soybean exposed to elevated CO2? Plant, Cell & Environment Vol 27, Issue 10, p1229–1238 (2004).
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CO2 Injection System for measurements of headspace gas samples
CO2 Injection System for measurements of headspace gas samples


``I have tried several very cheap CO2 meters but yours is by far the best. Very quick response and reproducible. Measures respiration rate for compost incubated for just an hour. but I leave it for 24h unless it is very unstable. Other meters are so slow they do not really work the way i need.``

Frank Shields, Gabilan Laboratory, Keith Day Company Ltd. Salinas, CA, USA

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