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The Nova 415 Series Trace O2 analyzers have been designed for the detection of trace levels of O2 in a non-corrosive gas stream. In operation, the O2 content in the sample gas is detected by a 'fuel cell' type electrochemical sensor. This sensor produces a small current output directly proportional to the O2 in the sample. This small output is compensated for temperature, amplified, and then displayed in PPM O2 on a digital meter. The signal is also sent to recorder terminals as a voltage or current output. As the sensor ages, the sealed internal electrolyte will be consumed and will require eventual replacement. The sensor normally lasts about 12 to 18 months and is a nominal-cost customer-replaceable part.
Unit of Measure


Method of Detection

N/A Customer replaceable 'fuel cell' oxygen sensor

Ranges Available

N/A Any range between 0-10 PPM and 0-10000 PPM


N/A ±1 PPM

Accuracy & Repeatability

N/A ±1% of full scale (minimum 0.5 PPM)


N/A Less than 1% of full scale per week

Response Time (T-90)

N/A O2 sensor may require an initial purge down from air to low PPM O2 which may last up to 6 hours. After purge, T90 response from 1000 to 0 PPM O2 is 30 seconds.

Ambient Temperature Range

N/A 32 to 122°F (0 to 50°C), Lower temperatures (-5°F, -20°C) with Cold Weather Package


N/A ±1% of full scale (minimum 0.5 PPM)

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 Low flow alarm

Analyzer Type

N/A O2 Analyzer

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    For continuous analysis of trace PPM levels of oxygen (O2) in process gas streams. Applications include blanketing mixtures, glove boxes, electronics, research, hydrogen/nitrogen mixtures, and many others.



  • Bright digital readout in PPM O2
  • Ranges available from 0 to 10 PPM to 0 to 10000 PPM O2
  • Microprocessor control for push button calibration
  • Unaffected by hydrocarbons in the sample
  • Easy-to-maintain, modular layout
  • Built in sample pump or pressure regulator, and 4-20 mA outputs
  • Manual or solenoid valves trap nitrogen (N2) in cell to avoid depletion when analyzer is powered off



  • 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
  • Sensors mounted in temperature controlled heated box to improve accuracy



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

Unique Applications


    The O2 sensor in the Model 415 is not normally affected by gas stream composition. However, high levels of acid gases such as carbon dioxide (CO2) and sulfur dioxide (SO2) can cause slightly elevated O2 readings and decreased cell life. 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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