Q-S151 Infrared CO2 Analyzer

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 rugged and modular for easy fit in our Q-Bo

  • Product Name:Q-S151 Infrared CO2 Analyzer
  • Model:Q-S151
  • Maunufactor:Qubit
  • Country:CA

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 rugged and modular for 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.

Packages that include Q-S151 CO2 Analyzer:

  • FL23 Algal CO2 Package

  • Q-Box CO650 Plant CO2 Analysis Packages

  • Q-Box RP1LP Low-Range Respiration Package

  • Q-Box SR1LP Soil Respiration Package


  • 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


  • J.B. Ries, A. L. Cohen and D. C. McCorkle. A nonlinear calcificationresponse to CO2-induced ocean acidification by the coral Oculinaarbuscula. CORAL REEFS Vol 29, Number 3, p661-674 (2010).

  • SimoneE. Kolb, Kevin J. Fermanich and Mathew E. Dornbush. Effect of CharcoalQuantity on Microbial Biomass and Activity in Temperate Soils. SSSAJ: Vol73, Number 4, p1173-1181. (2009).

  • U.Rascher, E. G. Bobich, C. B. Osmond. The Kluge-Lüttge Kammer: APreliminary Evaluation of an Enclosed, Crassulacean Acid Metabolism (CAM)Mesocosm that Allows Separation of Synchronized and DesynchronizedContributions of Plants to Whole System Gas Exchange. Plant biol (Stuttg)Vol. 8, number 1, p167-174 (2006).

  • JeanE.T. McLain and Dean A. Martens. N2O production by heterotrophic Ntransformations in a semiarid soil. Applied Soil Ecology Vol 32, Issue 2p253-263 (2006).

  • Jean E.T. McLain and DeanA. Martens. Nitrous oxide flux from soil amino acid mineralization. SoilBiology and Biochemistry. Vol 37, Issue 2, p289-299 (2005).

  • MarkO. Baerlocher, Douglas A. Campbell, and Robert J. Ireland. Developmentalprogression of photosystem II electron transport and CO2 uptake inSpartinaalterniflora, a facultative halophyte, in a northern salt marsh. Can. J.Bot. Vol. 82, Number 3, p365–375 (2004)

  • L.H.Ziska, J.A. Bunce and E.W. Goins. Characterization of an urban-rural CO2/temperature gradient and associated changes in initial plantproductivity during secondary succession. OECOLOGIA Volume 139, Number 3,p454-458 (2004).

  • Y.P.Cen and D. B. Layzell. Does oxygen limit nitrogenase activity in soybeanexposed to elevated CO2? Plant, Cell & Environment Vol 27, Issue 10,p1229–1238 (2004).

  • LewisH. Ziska, PhD, Dennis E. Gebhard, David A. Frenz, MD, Shaun FaulknerBenjamin D. Singerd and James G. Straka, PhD. Cities as harbingers ofclimate change: Common ragweed, urbanization, and public health. J ALLERGYCLIN IMMUNOL, Vol 111, Number 2, p290-294 (2003).

  • Colette A. Sacksteder andDavid M. Kramer. Dark-interval relaxation kinetics (DIRK) of absorbancechanges as a quantitative probe of steady-state electron transfer.PHOTOSYNTHESIS RESEARCH Vol 66, Numbers 1-2, p145-158 (2000).


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