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The Nova 412 Series O2 analyzers utilize a magneto-dynamic paramagnetic measuring cell and powerful selenium cobalt magnet assembly with on-board pre-amplification to provide the highest standard of O2 analysis. Accuracy is further augmented by built-in barometric pressure compensation and detector temperature control. For high purity applications (Model 412HP), a high resolution digital readout is added.
In operation, the magneto-dynamic cell makes use of the principle that oxygen is drawn into a magnetic field, thereby increasing the force exerted on a diamagnetic body suspended in the field. The amount of current necessary to restore the position of the body is directly proportional to the O2 level of the sample gas. Very few other gases respond this way, making this method of detection very specific to oxygen.

Cabinet: NEMA 4 Weather-proof steel cabinet with window
Unit of Measure


Method of Detection

N/A Magneto-dynamic paramagnetic O2 cell

Ranges Available

N/A 412 - any range from 0-2.0% to 0-100.0% O2; 412HP - 98.0 to 100.0 or 0 to 100.00 O2


N/A 412 - 0.1% O2; 412HP - 0.01% O2

Accuracy & Repeatability

N/A ±0.5% of full scale or 0.05%, whichever is greater


N/A ±0.2% of full scale per month

Response Time (T-90)

N/A 4-5 seconds

Ambient Temperature Range

N/A 32 to 122°F (0 to 50°C) @ 5-95% RH non-condensing. Lower temperatures (-5°F, -20°C) with Cold Weather Package. Sample dew point should be at least 9°F (5°C) below lowest sample temperature.


N/A ±0.5% of full scale or 0.05%, whichever is greater

Size & Weight

N/A Dimensions will vary depending on enclosure style and options required


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

Output Options

N/A 4-20 mA into 500 ohms non-isolated standard Isolated 4-20 mA, RS232, RS485, MODBUS, Ethernet outputs


N/A High and/or low alarm contacts available, relay contacts SPDT 5A @ 220 VAC rating

Analyzer Type

N/A O2 Analyzer

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    For continuous analysis of oxygen (O2) in process gas streams that contain gases that interfere with other methods of O2 measurement. For high accuracy or high purity applications.



  • Highest accuracy O2 analyzer, very stable
  • Fast response (T90 - 4 to 5 seconds) and bright digital readout
  • Linear over entire 0-100% range
  • Microprocessor control for push button calibration
  • Non-consumable O2 detector, no periodic replacement required
  • Built in sample pump or pressure regulator, and 4 - 20 mA outputs
  • To improve accuracy, detector is mounted in temperature controlled heated box and compensated for changes in barometric pressure at the vent



  • Hi/Low gas, low flow, and diagnostic alarms available
  • Isolated analog, RS232, RS485, MODBUS, and Ethernet outputs available
  • Sample conditioning systems available for removal of moisture, acidic gas, and dust
  • Cabinet purge system available for use in hazardous areas
  • One-step 'cal-now' button with touch screen LCD display
  • Full automatic calibration with touch screen LCD display
  • Cold weather package for operation to -20°C (-4°F)
  • Cabinet coolers can be fitted to most models
  • High purity version available for 98-100% O2 (412HP)



  • Nitrogen for zero
  • Air or analyzed calibration gas for span

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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