Device for guiding at least one fluid and fuel cell heating device

The device has flow areas (18, 25) for fluid containing detectable portion and non-containing detectable portion defined between a fluid inlet (14) and a fluid outlet (36), respectively. One of the flow areas completely surrounds the other flow area. The detectable portion of the fluid is formed as added odorants or natural component of the fluid, and as a sulfur-containing component and dyestuff. A treatment device (28) is installed in the latter flow area, and includes an adsorber i.e. fixed-bed adsorber. A flow path meandering runs through the treatment device. An independent claim is also included for a fuel cell heating device comprising a reformer unit, a fuel cell and a desulphurizing device provided on a housing to remove sulfur-containing component from process fluid supplied to a reformer unit and/or fuel cell.