| abstract |
The invention relates to an exhaust cleaning device for urea-supported catalysis of exhaust gases, comprising a tank (51) for urea solution intended to be injected into the exhaust gases. In particular, the invention relates to a sensor (50) situated in the tank or a tank pipe and adapted to continuously monitoring for presence of petroleum products in the solution. The sensor preferably comprises a rubber element which has the property of expanding in contact with petroleum products, which expansion is utilised to generate a signal. |