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The Nova 312 Series Portable Flue Gas Analyzer for NOx utilizes a reliable, stable nitric oxide (NO) sensor which responds quickly to the NO present in flue gases or engine exhaust. NO is the major component (90-95%) of the NOx found in flue gases or engine exhaust (except diesel).

In operation, a built in sample pump draws in the gas sample through the S.S. probe, 12 ft sample hose, condensate removal filter, secondary filter and flowmeter then on to the NO sensor. The detected NO is displayed on a digital meter.

The rechargeable battery provides enough power for about 8 hours of operation and the analyzer can be used while it is being recharged. The recharger is included.
Unit of Measure


Method of Detection

N/A Customer replaceable electrochemical NO sensor

Ranges Available

N/A 0-2000 PPM NOx (as NO)



Accuracy & Repeatability

N/A Better than 2% full scale


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

Response Time (T-90)

N/A 20-30 seconds for 90% of step change

Ambient Temperature Range

N/A 12 to 49 ºC55 to 120 ºF


N/A ±2% of full scale

Size & Weight

N/A approx. 26 x 18 x 13 cm @ 3.4 kg (10" x 7" x 5" @ 7.5lbs)


N/A 12V battery operation. 115VAC 60Hz for recharging (220VAC 50Hz available)

Output Options

N/A 4-20mA

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    Analysis of oxides of nitrogen (NOx) as nitric oxide (NO) for boiler, furnace, or engine exhaust.



  • Rugged design that is easy to operate and maintain
  • Fast warm-up and response
  • Disposable, long life electrochemical NO sensor
  • Digital readout meter
  • Rechargeable battery operation
  • Built in sample pump, filter and flowmeter
  • Active condensate removal
  • Rapid recovery on NOx overdose
  • Stainless steel probe with sample hose



  • Recorder output - 4-20mA
  • Stack temperature readout (312T)
  • Special sampling probes
  • Sample pre-cooler
  • Suitcase (K) style cabinet available
  • On-board data-logging to USB stick



  • Air for zero
  • Analyzed calibration gas mixture of PPM NO in air for span.

Unique Applications


        Note: For proper operation, the sample gas should also contain a small amount of oxygen.

      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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