Q21 Portable CO2 Analyzer for Spot Checks

The Quantek Model Q21 is our next generation portable CO2 analyzer. Use it for package testing, incubator applications, and much more.

This microprocessor controlled instrument features onboard data collection, hold function (the reading freezes on the screen when the test is complete), 12 hour internal battery, TFT full color screen, and EasyCal calibration using the touchpad.

Readings can be exported to USB thumbdrive (included) as CSV file for further processing. The Q21 comes with battery pack, internal pump, carry case, and accessories.

SKU: Q21 Category:
Lead Time: 3-5 business days

The Quantek Model Q21 CO2 Analyzer is designed for spot measurement and analysis of carbon dioxide levels. Analysis ranges of 0-20% or 0-100% vol/vol.

Simply introduce your sample gas flow into the inlet of the Q21 portable CO2 analyzer, and see results on the full color display within 20-25 seconds.  If you don’t have a source of flow or positive pressure, the analyzer can be equipped with an internal pump to draw in sample gas for analysis.


The Q21 portable analyzer weighs about 2 lbs and is easily carried.  Battery operation is included and provides approximately 12 hours of run time.


The analyzer is equipped with an intuitive set of menus, making operation and calibration fast and easy.


The sensor design has a low internal volume and requires only a low sample flow of about 5 to 1000 cc/min.  Our market leading CO2 sensor uses the latest in dual-wavelength NDIR measurement principles, reducing drift and allowing for a single point calibration.  While the sample introduced should be clean and dry (non-condensing), a PTFE filter can be attached to the tip of the sample probe to protect from moisture and particulates.


The instrument uses a solid-state infrared sensor which has no moving parts, a compact optical cell, and microprocessor-based calibration factors using a 6th order polynomial equation to linearize the full range measurement up to 100%. Infrared CO2 measurements are inherently non-linear, especially over a high range of concentrations. The math algorithm used in the Q21 yields more accurate measurements over a much wider range of concentrations than other methods.


The Q21 is equipped with onboard data logging – simply export the data to a CSV file to the included thumb drive.   You can collect data continuously, at the end of each test automatically, or when you press the “save” button.


The Q21 CO2 analyzer is equipped with an advanced 6 cell NiMH battery pack. The charger module plugs into any international 100-240V outlet, for charging or continuous operation.


The portable CO2 analyzer is backed it up with a two year warranty, twice the industry standard. The advanced design allows an output requiring less frequent calibration. It provides a stable, drift-free linearized voltage or current output that is much less susceptible to external electro-magnetic interference than conventional analog electronics.

Questions about conditioning your sample?  Please see our blog post

Carbon Dioxide Sensor Type Solid-state Infrared
Accuracy - Carbon Dioxide ± 1% of reading, or ± 0.1% CO2 (whichever is greater)
CO2 Minimum Detection Limit 0.1% (0-50% or 0-100% range) or 0.01% (0-10% or 0-20% range)
CO2 Calibration Controls Digital Keypad
CO2 Calibration Frequency Every 12 months; calibration gas recommended.
Expected Lifetime (oxygen) 4-5 years
Analog Output Not Available
Accuracy +/- 0.1% (from 0-20%), +/- 0.2% (from 20% to 50%), +/- 0.5% (from 50% to 100%)
Drift less than 0.4% per year
Oxygen Sensor Type Proprietary Electochemical
Response Time 20 seconds to T95
O2 Sensor Body Anodized aluminum
Sample Connection Sample Probe
Sample Method Pump
Sample Pump Internal, draws ~5cc/sec, with 2-12 second adjustable timer (on side of unit)
Pump Timing 2-20 seconds, continuous, or cycling on/off, programmable
Minimum Sample Required 10cc
Sampling Assembly Probe with male luer connection for side-port needle, PTFE tubing
Oxygen Calibration Controls Digital Keypad Adjustment
Instrument Calibration EasyCal calibration
Exhaust port Vents to air
Power Supply 100 to 240 VAC, internationally compatibile
Battery Operation Included, internal shrink wrapped NiMH battery pack
Input Voltage 100-240V, 50-60Hz
Battery Life 12-16 hour runtime
Measures: O2, CO2 CO2
Form Factor Portable
Size 8in x 7in x 2in (203 x 51 x 178 mm)
Weight 2 lbs (0.9kg)
Warranty 2 years, parts and labor
Standards CE, RoHS
Included Consumables Varies (depending on application)
Included Documentation Owners manual (includes operating instructions with detailed calibration instructions, calibration certficate, precautions), NIST calibration certificate
Origin of Goods Our goods are manufactured in the U.S.A.

The Model Q21 comes with an internal NiMH battery pack, capable of 10-12 hours of runtime.

  • Onboard data collection with USB thumb drive (provided)
  • Hard carry case
  • NIST traceable calibration certificate

Optional Items:

  • Internal Pump – A mini diaphram pump can be installed inside the analyzer, and draws approximately 5 cc per second.  Great for situations where there is no source of flow. Expected pump lifetime is 4-6 years.   The pump can be used in three modes – timed (1-20 seconds), cycling (on and off, programmable), or continuous.
  • Tubing / Fittings – if you need a specific tubing for an access port, or a different type of probe, please inquire.