Automatic m.p.t. indicator including photoelectric scanner - ensures compactness with oven opening for sample tube and has temp. sensor

摘要

The unit for the automatic indication of MP includes an oven with a bore for the insertion of the test tube with the sample. The temp. sensor is connected to the circuit controlling the oven heater as well as to a digital instrument showing the temp. The MP is detected by a photoelectric scanner. The longitudinal partition (22) and the intermediate wall bound two chambers (26) with one chamber featuring the holding plate for a motor driven blower. The adjacent chamber (26) is separated from the first chamber by an air duct and surrounds an oven (52) with a plate (58) carrying the oven housing (62). The latter is made of a ceramic oxide heated by a helical wire element (68); the temp. is sensed by a platinum element (70) in an eccentric bore (72) which faces the bore (74) for the tested sample probe. The sample is contained in a glass tube secured by a holder (76). The electro optical sensing of the MP is ensured by the photoresistor (82) set between the oven housing and a tube (54).