Sport samples are taken at one time at one point, normally via a pilot tube inserted in the process or pipeline. The sample is collected in a sample cylinder and takent to a laboratory for analysis.

Continuous samples are taken from the line and fed into an alalyser that continuosly analyses the gas. Alternatively, representative samples of gas are collected using a by-pass sampler mounted adjacent to the pipe or mounted directly on the pipe. Grab samples are then collected in a sample cylinder over a period, for later analysis in a laboratory. The features of the centrifugal multi-stage blowers manufactured by Continental Industrie, are mainly the simple design and mechanical reliability, both highly appreciated for this application.