Continuous Gas Monitors


The Guardian K-11 Series is a newly re-designed family of wall mounted, continuous gas monitors available for Carbon Monoxide, Hydrogen Sulfide, Oxygen, Chlorine, Sulfur Dioxide, Hydrogen Cyanide, Hydrogen Chloride, Nitrogen Dioxide, Nitric Oxide, Hydrogen, and many others. Standard features include digital display, NEMA 4X enclosures, 4-20 mA output, contact relays, and multi-level audio and visual alarms.

The Guardian controller is available with up to four remote sensors which are fast responding and unaffected by temperature and humidity changes. A system test button, local danger alarm indicator, and fault alarm assures proper operations. The unit is easy to install, operate, and maintain.

CEA Instruments has other units available for monitoring numerous toxic gases, combustible gases, and oxygen levels in personal size, as well as single, and multi-channel portable and fixed systems.


  • digital display
  • 4-20 mA output
  • multi-level audio and visual alarms
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