Abstract: A cartridge is used in apparatus for analysing a sample comprising a fluid and has a sample receiving cell which receives the fluid for analysis. The cell comprises a surface on one of two housing parts (120; 200; 300; 102; 202; 302) and a sensor comprising an electrical-mechanical transducer (92; 240; 340) spaced from said surface. The sensor is attached to one of the housing parts by an adhesive membrane (100; 246; 346) wherein the membrane is attached only to one of said parts of housing so that any slight relative movement or flexing of the housing parts does not result in forces being applied to the sensor via the membrane.

Abstract: An inhaler for dispensing a plurality of doses of particulate material has means for receiving and retaining a container (20) having a plurality of compartments, each for holding a respective dose (or part thereof). The container is moved by an indexing mechanism so as to bring successive compartments into registry with an airway to enable the contents of each compartment to be dispensed through the airway (50). The indexing mechanism is operated by a control member (6) which is movable through a series of alternating advance and return strokes (preferably rotational movements), the inhaler including a non-return mechanism (112, 114, 116 and 104) for preventing movement of the member in the direction of each return stroke before the completion of the respective preceding advance stroke, thereby to help to ensure that the indexing mechanism is properly operated.