Abstract:
In an analytical photometer, in particular multi-channel,for the simultaneous analysis of a multiplicity of samples, the light source provided is a flash tube for producing light pulses in which a permanent preionization discharge is maintained and the light energy is derived by optical fibres to be sent to optical systems where the beam is divided into an analysis beam which travels through the sample and a reference beam, both finally delivered to photodetectors. Both the divided beams pass through identical filtering systems for selection of a narrow spectral band of relevance for analytical purposes.
Abstract:
A fluid circulating and intercepting device (10) comprises a first (12) and a second block (11) facing each other with the interposition of an impermeable elastic and flexible diaphragm (13). The first block (12) is provided with at least one concavity (16) with its mouth close to the diaphragm (13) and into which opens out in a substantially axial direction a control fluid feed duct (17). The second block (11) is provided with ducts (14, 15) for circulation of the intercepted fluid which open out on the face in contact with the diaphragm (13), in correspondence with the concavity (16) in the first block (12).
Abstract:
A heating and temperature-control device for biological sample containers comprises an assembly of lamps emitting infrared radiation within a wavelength of 1-5.5 micrometers and heating said containers by irradiation, and a sensor for infrared radiation of wavelength 7-14 micrometers which picks up the emission from the containers which derives from their heating. The signal obtained from said sensor is used to control the lamp emission in such a manner as to obtain the required container temperature and then keep it constant.