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The Nova 920 Series analyzers have been designed for monitoring recovered and processed gases from biogas installations. This equipment continuously removes moisture from the wet sample gas without the need for cooling water, compressed air, or failure-prone thermoelectric elements. The 920 Series comes complete with pre-filter, sample pump, flow meter, continuous moisture removal system, long-life O2 sensor, infrared CO2/CH4 detector, low flow sensor, alarm relay contacts, and 4-20mA outputs for each gas measured. Sensors / detectors are mounted in an internal dedicated enclosure which is heated and temperature controlled to reduce drift due to ambient temperature swings. The internal sensor enclosure is removable to allow quick field change of sensors. The infrared detector can be cleaned in the field if necessary by the on-site technician. On all models with Autocalibration, all calibration functions are controlled through the display rather than through manual controls. The operator only has to input the calibration frequency and leave calibration gas cylinder connected to the analyzer - the rest is automatic. Diagnostics and troubleshooting information are also included in the display interface. This assists operators to quickly determine the cause of an alarm and get the analyzer back on line.

Unit of Measure

Method of Detection

N/A Electrochemical sensor for O2 & H2S, infrared detector for CH4 & CO2

Ranges Available

N/A 0-25.0% O2; 0 - 200 up to 0 - 2500 PPM H2S; any range between 0-50.0% and 0-100.0% CH4 and CO2


N/A 0.1% on CO2, O2, & CH4, 1 PPM on H2S

Accuracy & Repeatability

N/A ±1% of full scale


N/A Less than 2% of full scale per month

Response Time (T-90)

N/A Less than 30 seconds not including sample line delay

Ambient Temperature Range

N/A 40°F to 104°F (4°C to 40°C), Optional: -30°C to 55°C (-22°F to 131°F) with Outdoor Weather Packages


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

Size & Weight

N/A 24" H x 24" W x 10" D @ 90 lbs (61 x 61 x 25 cm @ 20 kg)


N/A 115 VAC 60 Hz (220 VAC 50 Hz available)

Output Options

N/A Isolated 4-20 mA standard RS232, RS485, MODBUS®, Ethernet outputs optional


N/A High O2, high CO2, low CH4, low flow; SPDT relays with 10A contacts

Primary Gas to be Measured

N/A Carbon Dioxide (CO2) Hydrogen Sulfide (H2S) Methane (CH4) Oxygen (O2)


    For continuous analysis of oxygen (O2), methane (CH4), and/or carbon dioxide (CO2) in recovered gases from landfill and biogas sites. Hydrogen sulfide (H2S) readout optional.


  • Easy to use manual potentiometer calibration with LCD digital displays for each gas
  • Temperature controlled sensors for maximum stability
  • Long life electrochemical O2 sensor
  • Infrared detector for reliable measurement of CO2 and CH4 (Models other than 910A or 910C). Detector may be cleaned in the field
  • Stainless steel hard tubing and corrosion-resistant components for internal sample health
  • Cabinet positive-pressure system to minimize the corrosive effects of hydrogen sulfide (H2S) on cabinet electronics & sensors
  • Built in sample pump, pre-filter, filters, and flow meter
  • Automatic moisture removal without the use of cooling water, compressed air or failure-prone thermal-electric elements
  • Back pressure regulator to allow user to measure and minimize vacuum effects if the unit is vented back to the blower
  • Rugged NEMA4 (IP65) enclosure
  • Isolated 4 - 20 mA outputs for each gas
  • Low flow alarm & relays

  • Same features as Base model, plus:
  • Automatic analyzer calibration with full-color touch screen LCD display
  • Diagnostic alarms with troubleshooting guidance in display
  • 'Cal Now' feature initiates full calibration with a single swipe of a magnetic wand


  • H2S & BTU readouts (see ranges and models)
  • Gas hi/low alarms with relay contacts
  • RS232, RS485, MODBUS® and Ethernet outputs (available on Model C only)
  • Class 1 Division 2 Group BCD rated purge kit for use in hazardous areas
  • Outdoor weather package for operation from -22°F to 158°F (-30°C to 70°C)
  • O2 measurement by paramagnetic detector


  • Ambient air for O2 span and CO2 & CH4 zero
  • Analyzed calibration gas of CO2 and CH4 in nitrogen for CO2 & CH4 span and O2 zero

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