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The Nova 375 Series Portable Flue Gas Analyzers have been designed for accuracy, reliability, ease of use and ease of service, providing a detailed analysis of flue gas composition. The sensors respond quickly to oxygen, CO2, and CO present in the flue gas sample. The O2 and CO sensor life expectancy is between 3 and 4 years. The CO2 infrared detector life is infinite under normal conditions of use, unless contaminated. The O2 and CO sensors are customer-replaceable. The infrared CO2 detector should not need to be replaced.

In operation, a built in sample pump draws in the flue gas sample through the S.S. probe, 12 ft. (4 m) sample hose, condensate removal filter, secondary filter and flow meter and then on to the three sensors. The detected O2, CO2 and CO are displayed on digital meters which have a switchable backlight for use in dark areas. A special water separating filter and seperate drain pump continuously remove condensate from the sample so the analyzer can be operated for long periods unattended.

The Nova 375T version also indicates stack temperature for doing fuel efficiency calculations. The temperature sensor is built into the sampling probe. Efficiency charts for each fuel are provided.

A rechargeable 'gel cell' battery provides enough power for about 16 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 Customer replaceable electrochemical oxygen and CO sensors Solid state infra-red detector for CO2

Ranges Available

N/A 0-1800°F (0-1000°C) stack temperature 0-20.0% CO2 0-2000 PPM and 0-4.00% CO - Switch selectable 0-25.0% Oxygen


N/A 0.1% O2, 1 PPM on CO and CO2

Accuracy & Repeatability

N/A 2% of full scale for O2 and CO2; ±10 PPM CO


N/A <2% full scale per 8 hours of continuous operation

Response Time (T-90)

N/A 10-15 seconds for O2; 20-30 seconds for CO and CO2

Ambient Temperature Range

N/A 0 to 40 ºC32 to 105 ºF


N/A ±1.0% of full scale for each gas measured

Size & Weight

N/A 16" L x 4 1/2" H x 8" D @ 13 lbs (40.6 x 20.3 x 10.8 cm @ 5.6 kg)


N/A AC/DC Operation, 115 VAC 60 Hz for recharging (Other voltages available.)

Output Options

N/A 0-1 VDC 4-20 mA

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    Analysis of oxygen (O2), carbon monoxide (CO), and carbon dioxide (CO2). For checking the combustion efficiency and burner & control performance of furnaces, heaters, and boilers. May be used in commercial, industrial, and residential settings.



  • Rugged design that is easy to operate
  • Fast warm up and response
  • CO2 actually measured by infrared detector, not calculated
  • Dual CO range : 0-2000 ppm & 0-4.00%
  • Rapid reading recovery after CO 'overdose'
  • Digital readout meters with backlight
  • Modular design that is easy to maintain
  • Rechargeable battery operation
  • Built in sample pump, filter and flow meter
  • Active condensate removal
  • Weatherproof (WP) cabinet with clear Lexan cover
  • Stainless steel probe with sample hose



  • Outputs of 0-1 V or 4-20 mA (can be isolated)
  • Special sampling probes
  • Suitcase (K) style cabinet available
  • AC power only operation
  • Gas alarms with LED
  • Detachable/portable data logger



  • Air for O2 span and CO/CO2 zero
  • Analyzed gas mixtures of CO2 and CO in nitrogen for span

Unique Applications


    The 375 Series should not be used for detecting these gases in ambient atmospheres for personnel safety purposes. 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.

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