esenseind aSENSE™ MIII

aSENSE MIII is a controller with built-in sensors to monitor carbon dioxide and carbon monoxide simultaneously. With these parameters, the programmable unit can control for example ventilation rates and generate alarm signals. The product is applicable in most large spaces where combustion is the sources of the potential toxic danger, such as in public garages, tunnels and mines. It can be used both to control the ventilation system and to be part of an alarm system. The sensor can be configured with the UIP Software.


Key benefits

-Measures carbon dioxide and carbon monoxide.

-Flexible control outputs for connection to DDC, or direct control of dampers and speed regulated fans.

-Contributes to lower energy costs when applied in Demand Controlled Ventilation.

-Internal data recorder for environmental trend logging.

-Serial com port for connection to PC, GSMmodule or local network.




The aSENSE MIII is applicable in most large spaces where combustion is the source of the potential toxic danger, such as in public garages, truck terminals, tunnels and mines. It offers the possibility to combine CO and CO2 measurements which not just guarantees public safety, but also saves energy when applied to Demand Controlled Ventilation. The aSENSE MIII offers the possibility to regulate ventilation systems stand-alone, as well as being just a sensor in a larger system. To cover larger spaces, several sensors could be joined in a simple relay loop and together control an intermittent two speed exhaust fan, for example.

The sensors can also be connected together in a MODBUS RS485 network (optional) for serial communication to a global control system or to a simple web Gateway for data presentation on the internet. All engines generate CO and we need protection against this toxic gas. What we do not seem to realize is that a warm, modern engine with catalytic exhaust system typically generates 140 times more CO2 than CO, in which case the CO2 constitutes the potential threat. This fact forces us to measure both gases to be able to guarantee personal safety.



Operating Principle Non-dispersive infrared (NDIR)
Measured gas Carbon dioxide (CO2) and carbon monoxide (CO)
Measurement range CO2 0 to 2000 ppm (CO2), 0 to 100 ppm (CO)
Accuracy ±30 ppm ±3% of reading (CO2), ±10 ppm (CO)
Dimensions 142 mm x 86 mm x 46 mm
Life Expectancy > 5 years
Operation temperature range 0 to 50 °C
Operation humidity range 0 to 95% RH (non-condensing)
Power supply 24 VAC/VDC
Warm-up time ≤15 minutes
OUT 1 linear output 0 to 10 V DC (CO)
OUT 2 linear output 0 to  10 V DC (CO2)
OUT 3 relay Closed<30ppm CO<1400ppm (CO2)Open>35ppm CO>1500ppm (CO2)
OUT 4 open collector Error detection



Art.No. Product Additional features
040-8-0064 aSENSE MIII  Disp Display