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The Nova Model 436 Series Tri-gas analyzer is designed specifically for monitoring H2 purity in the H2 feed to a power generator and to monitor the purging procedure during shut down. The analyzer can measure the following gases by switch selection :
Range 1: 0-100.0% H2 in Air
Range 2 : 0-100.0% H2 in CO2
Range 3 : 0-100.0% Air in CO2
A 4-20 mA output is provided for the range of 85-100% H2 in air, along with two gas alarms and a sensor fail alarm.

Unit of Measure


N/A Temperature controlled thermal conductivity (T/C) cell, cannot be burned out due to loss of flow or changing gases


N/A Range 1 : 0-100% H2 in Air Range 2 : 0-100% H2 in CO2 Range 3 : 0-100% Air in CO2


N/A ±0.1% of gas measured


N/A ±1% F.S except in 85-100% H2 in Air range which is within 0.2% absolute H2


N/A H2 in CO2 or Air in CO2 1% F.S. per week maximum drift, 0-100% H2 in Air range is ±0.2% per week


N/A 10-15 seconds to 90% step change - not including sample transport time


N/A 0 to 49 ºC32 to 122 ºF


N/A ±0.4% of F.S. on H2 in Air range, ±1% of F.S. in H2 or Air in CO2 ranges


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


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


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


N/A Alarm set points are field adjustable Alarms have front panel light for each alarm and SPST (normally energized) relay with 5A rating at 250VAC non-inductive load Dual alarms are provided for low H2 purity. Detector fail alarm also provided as standard


N/A Carbon Dioxide (CO2) Hydrogen (H2)


N/A Power Industry


N/A Panel Mount Rack Mount




    For continuous analysis of hydrogen (H2) purity and for purge monitoring of hydrogen-cooled generators and synchronous converters.


  • One analyzer monitors all 3 gases for purity (Range 1) or purging (Ranges 2 and 3) :
    • Range 1 : 0-100% H2 in Air
    • Range 2 : 0-100% H2 in CO2
    • Range 3 : 0-100% Air in CO2
  • Best value continuous tri-gas analyzer
  • Bright digital readout, 4-20 mA Outputs
  • Long life electrochemical thermal conductivity cell with high accuracy and repeatability, cannot be burned out.
  • Explosion proof gas detector enclosure suitable for Class 1 Division 1 Group BCD rated areas, UL/FM/CSA certified
  • Fast response (T90 -10 to 15 secs)
  • Easy to maintain modular layout
  • Built in pressure regulator


  • Isolated analog, RS232, RS485, MODBUS and Ethernet output available options.
  • Auto calibration option which includes the following features :
    • Touch-screen display for easy entry of calibration gas settings, alarm set points, and calibration frequency
    • One-touch 'cal-now' button (magnetic switch in explosion proof control cabinet) permits easy, and complete calibration without needing to open cabinet cover


  • Channel 1 - Air for Zero, 100% H2 for Span
  • Channel 2 - 100% CO2 for Zero, 100% H2 for Span
  • Channel 3 - 100% CO2 for Zero, Air for Span

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