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The Nova 313 Series Portable Flue Gas Analyzer for NO, NO2, or NOx utilizes reliable, stable NO and/or NO2 sensors which respond quickly to the NO or NO2 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 both sensors. The output of each sensor is then amplified and displayed on a large LCD digital meter with backlight. A selector switch allows the two gases to be read individually or as a total (NOx).

The rechargeable battery provides enough power for about 20 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 plus a stainless steel probe with 12 ft. (4 m) hose are included.

Unit of Measure

Method of Detection

N/A Customer replaceable electrochemical nitric oxide and nitrogen dioxide sensors Expected life 2-3 year each

Ranges Available

N/A 0-2000 PPM NO; 0-800 PPM NO2; 0-2000 PPM Nox; (0-5000 PPM available) Ranges switch selectable


N/A 1 PPM on 0-2000 PPM; 10 PPM on higher ranges

Accuracy & Repeatability

N/A Better than 2% full scale


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

Response Time (T-90)

N/A 20-30 seconds

Ambient Temperature Range

N/A 12 to 49 ºC55 to 120 ºF


N/A ±2% of full scale

Size & Weight

N/A 10" L x 7 1/2" H x 8" D @ 8 lbs (25 x 19 x 20 cm @ 3.6 kg)


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

Output Options

N/A 4-20 mA or 0-1 VDC


N/A NO, NO2 or NOx alarms with LED

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 Oxides of Nitrogen (NOx)

Industry Type

N/A Flue Gas or Emissions


    Analysis of oxides of nitrogen (NOx) such as nitric oxide (NO) and/or nitrogen dioxide (NO2). For boiler, furnace, or engine exhaust monitoring and analysis.


  • NOx can be read as NO, NO2, or as total
  • Rugged design that is easy to operate
  • Disposable, long life electrochemical NO and NO2 sensors
  • Digital meter readout with backlight
  • Modular layout that is easy to maintain
  • Rechargeable battery operation
  • Built in sample pump, filter, and flowmeter
  • Active condensate removal
  • Rapid reading recovery after NOx 'overdose'
  • Weatherproof (WP) cabinet with clear Lexan cover
  • Stainless steel probe with sample hose


  • Recorder outputs of 0-1 V or 4-20 mA (can be isolated)
  • Stack temperature readout (313T)
  • Special sampling probes
  • Sample pre-cooler
  • Suitcase (K) style cabinet available
  • AC power only operation
  • NO, NO2 or NOx alarms with LED
  • Detachable/portable data logger


  • Air for zero.
  • Analyzed calibration gas mixtures of PPM NO and PPM NO2 in nitrogen for span.

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