Liquid level detection device for reaction plate of automatic biochemical analyzer

Abstract

A liquid level detection device for a full-automatic biochemical analyzer reaction disc is characterized by comprising a mounting panel, a buoy, a convex column, guide columns, a trough type photoelectric switch and a position signal detection unit. Two guide columns are vertically and parallelly arranged on the lower portion of the mounting panel, two opposite sides of the buoy are slidably mounted between the two guide columns through C-shaped sliding grooves in a matched manner, so that the buoy freely and vertically slides between the two guide columns, the convex column is mounted at the top end of the buoy, the trough type photoelectric switch is mounted on the mounting panel, the upper end of the convex column corresponds to a groove of the trough type photoelectric switch, and a signal output end of the trough type photoelectric switch is electrically connected with the position signal detection unit. Compared with other liquid level detection devices adopting the buoy principle and with travel switches, magnetic switches and the like, the liquid level detection device with the trough type photoelectric switch has the obvious advantages that the switch cannot generate additional resistance on the buoy when the detection state changes, and the switch cannot be interfered by change of magnetic fields and electric fields.

Description

technical field [0001] The invention relates to a liquid level detection device for a reaction plate of a fully automatic biochemical analyzer. Background technique [0002] All chemical reactions of the biochemical analyzer take place in the constant temperature system of the reaction plate. Usually, the reaction plate adopts the solution of ring-shaped constant temperature water tank. Therefore, the liquid level detection of the liquid medium in the water tank has great significance for the establishment of the reaction environment and abnormal alarm. Significance. [0003] At present, most of the existing automatic biochemical analyzers use the resistance method and the capacitance method to detect the liquid level. The former has the problem of relying on the conductivity of the liquid, which limits the scope of application of the liquid medium, and due to the large change in the resistance value of deionized water, the stability is poor. The liquid level detection met...

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Problems solved by technology

The former has the problem of relying on the conductivity of the liquid, which limits the scope of application of the liquid medium, and due to the large change in the resistance value of deionized water, the stability is poor

The liquid level detection method used in other systems is also the common buoy method. The common buoy type liquid level detection device on the market uses a travel switch or a magnetic switch to detect the state of the float. The float produces additional resistance, so the accuracy is not high, and it is susceptible to defects such as magnetic field interference, so the reliability is not high, and the volume is large, which is not conducive to the arrangement of the narrow and long space of the reaction plate

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