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Interpretation of measurements

We recommend the monitor’s threshold levels for CO2 alarming indication be set as following:

  • below 800 ppm green, satisfactory ventilation in occupied space
  • between 800 and 1,500 ppm orange, warning – inspect ventilation devices and return to normal as soon as possible
  • Above 1,500 ppm red, insufficient ventilation – take action as soon as possible to act on cause and return to normal

Outdoor CO2 levels are about 420 ppm and the closer you are to this the better.

The easiest way to lower the CO2 level is to open windows, vents and doors on opposite sides of the room to enable air circulation. Alternatively, turn on the outdoor ventilation.

Annual evaluation

We offer an annual evaluation of the means of ventilation and self-diagnosis for the owner and building management. Contact us


Viscon Systems is a business of Vista Controls Pty Ltd ABN 49 101 534 641 Est. 2002. Sales representative for Aranet.