Flow-through sensors definition

The flow-through sensors described in this Section comply essentially with the definition of biosensor. This word, like every term used to designate devices of scientific and popular note, has been the object of a number of definitions of both generic and specific scope. In a broad sense, a biosensor is any instrument or technique that measures biomolecules. In stricter terms, Rechnitz defines a biosensor as "a device that incorporates a biochemical or biological component as a molecular recognition element and yields an analytical signal in response to biomolecules" [10]. In between these two... 

The pneumatic system comprises of various parts. The air or any other gas is pressed by the compressor through the pneumatic volume, capillary and pneumatic volume, which smoothen the flow and pressure at the measuring system inlet. The air flow is determined from the pressure difference along the flow capillary via a differential pressure sensor. The control of the volume of separating bubbles is arranged by a deflector located opposite to the capillary at a definite distance (Miller et al. 1994). The optimum internal gas volume of the instrument and selection of the right capillary are two important points in the design of the device as discussed below. 

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