Gaseous product detecting device

Abstract

A gaseous product detecting device (1; 20; 30; 40; 70) has a measuring cell (6; 59; 60), a filtering element (3; 45) for retaining particulate present in the air entering the measuring cell (6; 59, 60), and a detecting element (13; 50, 56) housed inside the measuring cell (6; 59, 60). A wall (9; 49, 61; 79, 82) of the measuring cell (6; 59, 60) is movable in fluidtight manner between a withdrawn position, in which the measuring cell (6; 59, 60) has a maximum volume, and a forward position, in which the measuring cell (6; 59, 60) has a minimum volume and the detecting element (13; 50, 56) is prevented from being impressed by resting against a shutter surface (5a; 43a, 49b; 82a) of the measuring cell (6; 59, 60).

Dependencies are inferred from the claim text.