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The Nova 320 Series of Portable Flue Gas Oxygen Analyzers utilize a reliable, stable oxygen sensor which responds quickly to the oxygen present in a flue gas sample. Its life expectancy is between 3 and 4 years. The sensor is very easy for the customer to replace and at a reasonable cost.

A rechargeable ‘gel cell’ battery provides enough power for the pump and electronics for about 20 hours of continuous operation. The analyzer can still be operated while it is being charged. A red LED indicates when to recharge and a green LED indicates that it is receiving recharging power. The analyzer is supplied with a 12 ft. sample hose and a stainless steel probe.

The Model 320 can optionally indicate stack temperature (Model 320T; 0-1800°F or 0-1000°C) for doing fuel efficiency calculations. The temperature sensor is built into the sampling probe. Efficiency charts for each fuel are provided.
Unit of Measure


Method of Detection

N/A Long life electrochemical oxygen sensor

Ranges Available

N/A 0-5.0%, 0-10.0%, 0-25.0%, 0-50.0%


N/A 0.1% O2

Accuracy & Repeatability

N/A ±1% of full scale (±2% of full scale above 30% O2)


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

Response Time (T-90)

N/A 8-10 seconds for 90% of step change

Ambient Temperature Range

N/A 0 to 40 ºC32 to 105 ºF


N/A ±1% of full scale

Size & Weight

N/A 10" L x 7 1/2" H x 6 1/2" D @ 8 lbs (25.5 x 19 x 16.5 cm @ 3.6 kg)


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

Output Options

N/A 0-1 V or 4-20 mA (optional)

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    Analysis of oxygen (O2) in flue gases from any type of fuel. For checking combustion efficiency, air infiltration 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 and maintain
  • Fast warm-up and response
  • Long life 'fuel cell' oxygen sensor (3-4 year life)
  • Digital readout meter with backlight
  • Rechargeable battery operation
  • Built in sample pump, filter and flow meter
  • Continuous condensate removal
  • For use on any fuel
  • Weatherproof (WP) cabinet with clear Lexan cover
  • Stainless steel probe with sample hose
  • Pays for itself in months through fuel savings



  • Outputs of 0-1 V or 4-20 mA
  • Special sampling probes
  • Sample pre-cooler
  • Suitcase (K) style cabinet available
  • AC power only operation
  • Detachable/portable data logger



  • On air for span
  • On nitrogen for zero

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.

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