Automotive Air Quality Sensors

The AQS module must be exposed to a source of external air at all times. The location must be chosen so

as to maximize air renewal; dead spaces must be avoided. The best location is in the air intake BEFORE

(upstream) the filter. When the flap is closed, it can create a “pocket” of stagnant air; for that reason, the

AQS module should not be too “deep in the duct”.

Preferably, the filtering membrane should be facing downward. If this is not possible, it should be vertical,

but should never be facing upward, to prevent accumulation of dust

If the AQS module is attached with a bayonet to the air intake wall with its body “in the cabin”, the fixation

should be sufficiently air tight so that no air from the cabin is pulled in front of the sensor head.