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The Model 436 analyzer is typically divided into 2 sections which are electrically connected. The control section contains the main microprocessor board as well as the digital readout meters, alarms, calibration and range switches, power supply and temperature controller for the T/C cell. The gas detector section contains the temperature controlled thermal conductivity cell, a five way selector valve, gas pressure regulator, flow indicator and 2 flame arrestors.
Either the gas detector section on its own or both gas detector and control sections may be purchased in explosion-proof cabinets. The explosion-proof cabinets are UL listed and CSA certified for use in Class 1, Division 1, Groups BCD hazardous areas. If the gas detector section only is explosion-proof, the control section is typically enclosed in a panel mount cabinet for use in a general purpose, non-hazardous area. The control section can also be mounted in a NEMA4 wall mount or rack mount (RM) cabinet.
Unit of Measure


Method of Detection

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

Ranges Available

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

Accuracy & Repeatability

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

Response Time (T-90)

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

Ambient Temperature Range

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

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 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

Analyzer Type

N/A Tri-Gas Analyzer



    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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