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The Nova 7900P Series Portable Heat Treat Analyzers are designed for the spot-check monitoring of various combinations of gases such as oxygen (O2), methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), and hydrogen (H2) for industrial processes including heat treating atmospheres.

Standard Cabinet: Bench Top

Detection Technologies:
O2 - long-life electrochemical sensor
CO - non-consumable, long-life infrared detector
CO2 - non-consumable, long-life infrared detector
CH4 - non-consumable, long-life infrared hydrocarbons detector
H2 - non-consumable, long-life thermal conductivity cell; available with internal compensation for interference effects from CO, CO2, and CH4

Model 7900P2G: CO2 and H2

Note: H2 measurement may be sensitive to interferences from other gases. Full application information required before specifying H2 analyzers.

Unit of Measure


Gases Measured

N/A CO2 - non-consumable, long-life infrared detector; H2 - non-consumable, long-life thermal conductivity cell

Ranges Available

N/A 0 - 1.00%, 0 - 50.0% CO2; 0 - 2.0%, 0 - 50.0% H2


N/A 0.1%

Accuracy & Repeatability

N/A ±1% of full scale


N/A ±0.5 % of full scale in 8 hours.

Response Time (T-90)

N/A Approximately 20-30 seconds to 90% step range, following warm-up

Ambient Temperature Range

N/A 0 to 50 ºC32 to 122 ºF


N/A ±1% of full scale for each gas measured

Size & Weight

N/A 10" H x 10" W x 14" D (25 x 25 x 35 cm) @ Approx. 20 lbs (9 kg) Physical data may vary depending on model and options selected


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

Output Options

N/A 4-20 mA for each gas measured. 0-1 VDC or serial output also available

Analyzer Type

N/A CO2 and H2 Analyzer



    For monitoring heat treating atmosphere gases in any combination of carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), hydrogen (H2), oxygen (O2) and dew point. Also available for other industrial processes that include hydrogen.



  • Best value H2-based multi-gas portable analyzer
  • Fast warm up and response time
  • Long life thermal conductivity cell for H2 cannot be burned out due to loss of flow
  • Long life electrochemical O2 sensor
  • Sensitive infrared detectors for CO, CO2, and CH4
  • H2 reading compensated for presence of CO, CO2and CH4
  • Fast response ceramic dew point sensor
  • Bright LED digital readouts
  • Modular layout that is easy to maintain.
  • Rechargeable battery operation
  • Built-in sample pump, flow meter and filters
  • Rugged bench top (BT) style cabinet
  • Solenoid valves used to isolate low range dew point and O2 sensors during sample purge and transportation to prevent ambient air contamination



  • Recorder outputs of 0-1 V or 4-20 mA (can be isolated)
  • Condensate removal for wet applications
  • Suitcase (K) style cabinet available
  • AC power operation
  • Carbon potential calculation with CO, CO2 and CH4 channels
  • Sensor mounted in temperature controlled heated box for improved accuracy (AC only)
  • LCD digital readouts with backlight



  • Analyzed calibration gas mixture to span all readings.

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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