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For ambient air or confined space monitoring for up to any four choices of O2, CO2, NO, NO2, CO, LEL combustibles, temperature, and % RH. Single gas versions are also available for H2S, SO2, Cl2, HCL & NH3.


Unit of Measure

Method of Detection

N/A O2, CO, SO2, NO, NO2, H2, CL2, NH3 and H2S by electrochemical sensor, % RH by dielectric ceramic sensor, CO2 by infrared sensor, combustibles by catalytic sensor

Ranges Available

N/A 0-100 PPM NO 0-100% RH 0-20 PPM H2S 0-20 PPM NH3 0-20.0 PPM CL2 0-20.0 PPM NO2 0-200 PPM CO 0-200 PPM H2 0-25.0% O2 0-50°C Temp. 0-50.0 PPM SO2 0-5000 PPM CO2


N/A 0.1% on % gas, 1 PPM on PPM gas

Accuracy & Repeatability

N/A ±2% of full scale


N/A Less than 1% of full scale or 1 PPM per 8 hours, whichever is greater, with constant ambient temperature

Response Time (T-90)

N/A Varies with individual sensor but generally under 2 minutes for full reading

Ambient Temperature Range

N/A 4 to 49 ºC40 to 120 ºF


N/A ±2% of full scale or 1 PPM, whichever is greater

Size & Weight

N/A 15" W x 7" H x 12" D @ 14 lbs. (374 x 175 x 305 mm @ 6.4 kg)


N/A 115 VAC, 60 Hz for recharging 220 VAC, 50 Hz

Output Options

N/A 0-1 VDC 4-20 mA


N/A Audible and visual alarms are optionally available as well as low battery and low flow

Unique Applications

      Warm up time is approximately two minutes however NO and NH3 may take up to 2 hours for full stability. The operating humidity range for this series of analyzers is 0-90% RH non-condensing. 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.

Models & Configuration Guidelines

      Standard system comes with 'K' series suitcase-style enclosure, built-in sampling pump, flow meter, pre-filter, liquid block, 12 ft (3.6 m) sample hose, rechargeable battery, and recharger.

Gases Measured

N/A 0) NH3 - 0-20 PPM 1) O2 - 0-25.0% 2) CO - 0-200 PPM 3) CO2 - 0-5000 PPM 4) LEL Combustibles (not avail. for 501 Series) 5) H2S - 0-20 PPM 6) SO2 - 0-50 PPM 7) NO - 0-100 PPM 8) NO2 - 0-20 PPM 9) CL2 - 0-20 PPM

Industry Type

N/A Indoor Air Quality Personnel Safety Steel Making

N/A For ambient air or confined space monitoring for up to any four choices of O2, CO2, SO2, NO, NO2, H2, CO, Cl2, NH3, H2S, LEL combustibles, temperature, and % RH.


  • Rugged design that is easy to operate and maintain
  • Fast warm-up and response
  • Separate electrochemical sensor for O2, CO, SO2, NO, NO2, H2, CL2, NH3, and H2S
  • Sensitive infrared detector for CO2
  • Catalytic sensor for combustibles
  • Capacitive ceramic sensor for % RH
  • Digital readout with backlighting for each gas
  • Built in sampling pump, flow meter, filter and 12 ft. sampling hose
  • Rechargeable battery
  • Rugged suitcase (K) style case


  • Audible and visual alarms
  • Built in printer


  • Nitrogen (N2) for zero
  • Analyzed gas cylinders for span

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