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The Nova Model 7900P Series Heat Treat analyzers utilize a three channel high stability infrared detector for the simultaneous measurement of CO, CO2, and CH4 in exothermic or endothermic gas mixtures. In addition, the analyzer can be supplied with a fully compensated thermal conductivity cell for H2. A separate O2 detector can also be supplied for measuring low (PPM) or percent levels of oxygen in the atmosphere gas stream. Dew point is detected by a dielectric ceramic sensor and is available in standard and low ranges. All detected gases have a separate LCD digital readout and a linear recorder output. The customer may choose any combination of gases to be measured.

The 7900P series analyzers are complete with integral sampling pump, rechargeable battery, filters, flow meter, and sampling hose. Solenoid valves are used to isolate low range dew point and O2 sensors during purges and when analyzer is not in use to prevent ambient air contamination of the sensors and greatly reduce purge time during start-up.
Unit of Measure


N/A Customer may select one or more combinations of CO, CO2, H2, CH2, O2, or dew point


N/A 0-10% , 0-100.0% CH4 0-10,000 PPM, 0-50.0% O2 0-100% NH3 0-2.00% , 0-100.0% CO2 0-20.0%, 0-100.0% CO 0-40.0%, 0-100.0% H2 -10 to +80°F(-23 to +26°C) Dew Point -148 to +68°F(-100 to +20°C) Dew Point


N/A 0.1% on % versions, 10 PPM on PPM versions


N/A ±1% of full scale


N/A ±0.5 % of full scale in 8 hours.


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


N/A 0 to 50 ºC32 to 122 ºF


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


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


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


N/A Carbon Monoxide (CO)


N/A Heat Treating Atmospheres Steel Making


    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.

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