AIR INTAKE OF MOBILE POLLUTION INDICATOR

摘要

The discussed solution guarantees failure-free and lasting equipment operation and reliable results of analyses. The analysed air is drawn from outside the vehicle. The employed valve configuration with flow resistance detector and connection with a control device allows for periodic self-cleaning of the system, especially of the filtering element, by way of using a back blowdown at high yield. According to the invention, the air intake of a mobile pollution indicator is characterised by the following: a filter gauze (3) is located at the air inlet, which is fixed onto the vehicle side (1), while in the path of the air, there is a controlled pneumatic valve (4) in the form of a cylinder (5) and piston (6), both made of self-lubricating, inactive material. Moreover, it comprises a moisture and temperature sensor (10), and the flow resistance detector (9) (differential pressure) is connected to the air inlet (7) and outlet (8) to and from valve (4). The sensor, detector and valve are all connected to a microprocessor control system (11).