The IFRF provides 'Alcan' probes for gas and low/medium concentration solids sampling. The first stage of the sampling consists in the rapid cooling (quenching) of the sample sucked through a cooled tube. The final admissible temperature is in the range 150-300'C where most chemical constituents have ceased to evolve and where water vapor does not condense. The quenching time is of the order of 3 milliseconds which may be interpreted as a small displacement of the measuring point (less than 6 cm in most cases). The diameter of the quenching tube can be selected to sample isokinetically with a suction rate in the neighborhood of 5-10 1/min.

Sintered bronze and ceramic filters are supplied for filtering solids from the gas stream. Ceramic filters are recommended for gas streams where reactions may occur on the surface of the bronze.