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The Model 309 Series Portable Flue Gas Analyzer has been designed for accuracy, reliability and ease of use and service. The 309 uses a long life electrochemical O2 sensor and a solid state infra red CO2 detector, both of which respond quickly to O2 and CO2 present in the flue gas sample.

In operation, a built-in sample pump draws in the flue gas sample through the S.S. probe, 12 ft sample hose, condensate removal filter, secondary filter and flow meter then on to the O2 sensor and CO2 detector. The detected gases are displayed on separate LCD digital meters which have a switchable backlight for use in dark areas.

The 309 can optionally indicate stack temperatrue (309T) for doing fuel efficiency calculations. The temperature sensor is built into the sampling probe.  Efficiency charts for each fuel are provided.

A rechargeable battery provides enough power for about 8 hours of continuous operation and the analyzer can be used while it is being recharged.  A red LED tells when to recharge and a green LED verifies that it is receiving recharging power. The recharger is included.
Unit of Measure

Method of Detection

N/A Electrochemical O2 sensor Infrared detector for CO2

Ranges Available

N/A 0-5000 ppm; 0-1%; 0-10%; 0-20%; 0-50%; 0-100% CO2
0-25% O2


N/A 0.1% O2 and CO2

Accuracy & Repeatability

N/A Within ±2% full scale


N/A Within 1% full scale per 8 hours of continuous operation

Response Time (T-90)

N/A O2 less than 10 seconds; CO2 less than 30-40 seconds to T-90

Ambient Temperature Range

N/A 4 to 49 ºC40 to 120 ºF


N/A ±1.0% of full scale

Size & Weight

N/A K Style - 14" L x 10 1/2" W x 6" H @ 12 lbs ( 36 x 27 x 15 cm @ 5.5 kg) WP Style - 11 1/2" L x 8" W x 7 1/4" H @ 8 lbs (29 x 20 x 18 cm @ 3.6 kg)


N/A AC/DC Operation, 115 VAC, 60 Hz for recharging

Output Options

N/A 0-1 VDC 4-20 mA

Unique Applications

    All Nova analyzers are built using proven technologies and techniques. If this product does not suit your application, please contact Nova. In many cases, we are able to build an analyzer specific to your needs.

Primary Gas to be Measured

N/A Carbon Dioxide (CO2) Oxygen (O2)

Industry Type

N/A Flue Gas or Emissions


    Analysis of Carbon Dioxide (CO2) and Oxygen (O2). For checking combustion efficiency, burner & control performance of furnaces, heaters and boilers in commercial, industrial and residential applications.


  • Rugged design that is easy to operate
  • Fast warm-up and response
  • Solid state infrared detector CO2
  • Long-life electrochemical sensor for O2
  • Digital readout meter with backlight
  • Modular layout that is easy to maintain
  • Rechargeable battery operation
  • Stainless steel probe with sample hose
  • Built in sample pump, filter and flow meter
  • Weatherproof (WP) cabinet with clear Lexan cover


  • Recorder outputs of 0-1 V or 4-20 mA
  • Sample pre-cooler for hot samples
  • Condensate removal for wet applications
  • Suitcase (K) style cabinet available
  • AC power only operation
  • CO2 and O2 alarms with LED
  • Data logger


  • Air for CO2 zero and O2 span
  • Analyzed calibration gas for CO2 span and O2 zero

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