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Spectra-1 Extractive Gas Monitor

Spectra-1 Extractive gas monitor features the same gas analysis software as used by the open path Spectra-1 monitor. Tuneable Diode Laser Absorption Spectroscopy (TDLAS) based gas sensing. Closed path internal multi-pass sampling cells are used instead of an open path configuration to calculate gas concentrations. 19′ rack mounted design. Options include internal sampling pump and 4-20mA output. Standard configurable RS232 data output.



  • Industrial Process Monitoring
  • Agricultural Confined Feeding
  • Classified (zone) Area Monitoring
  • Duct Monitoring
  • Stack Monitoring


  • gas specific – no false alarms
  • fast response
  • no water interference
  • reliable unattended performance
  • broad dynamic range
  • direct measurement of gas species – not indirectly inferred
  • no consumables or moving parts
  • software upgrades for performance enhancements
  • lower cost
  • keypad For System Configuration
  • internal multi pass optical sampling cell
  • gas concentration – ppm or ppm-m
  • averaging time 1 to 600 seconds
  • maximum signal level set (i.e. 90%)
  • minimum signal level set (i.e. 5%)
  • RS232 com port setting (baud rate)
  • logging options
  • calibration settings (Factory set)


Detectable gases include:
HF, HCN, O2, C2H2, C2H4, C2H6, H2O, CH4, NH3, CO, CO2, and H2S.