Patent ID: 7628086

Claim:
A method for cleaning an apparatus for taking samples of a gaseous medium containing solid particles, the apparatus comprising: a pipe having one end adapted for introduction into the gaseous medium, a tubular filter for filtering off the solid particles that is positioned coaxially with the pipe and communicates with the interior of the pipe, a removable closure positioned on the downstream side of the tubular filter and coaxially with the pipes withdrawal means for withdrawing the filtered gaseous medium from the outer side of the tubular filter, and separate blow back means in communication with the outer side of the tubular filter, said method comprising the steps of: discontinuing withdrawal of gaseous medium by the withdrawal means from the outside of the tubular filter; introducing a first cleaning gas to the outer side of the tubular filter via the separate blow back means after withdrawal of the gaseous medium has been discontinued; passing the cleaning gas from the outer side of the tubular filter to the inner side of the tubular filter; and introducing a stream of a second cleaning gas coaxially with the axis of the pipe so as to carry particulate matter to the end of the pipe adapted for introduction into the gaseous medium.