Thermal Conductivity Comparison Table
Representative photograph(s), actual product appearance may vary.

Features	7866DHH2	7866DO2
Units of Measure	% Hydrogen in Air, % Carbon Dioxide in Hydrogen, % Carbon Dioxide in Air	% Hydrogen or Carbon in background gas of Air, Nitrogen, or Oxygen
Options	7872 Sample Panel, RS-422/485/Modbus Communication, 7866DRRI Remote Indicator	RS-422/485/Modbus Communication
Transmitter Output	4 mA to 20 mA or 0 mA to 20 mA; customer specified
Power Requirement	Control unit only; Universal Supply 90 Vac to 264 Vac or 24 Vac/Vdc; 50 Hz to 60 Hz
Accuracy	± 2 % of span
Availability	Global

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