Pipettor close performance detection device

Abstract

The invention relates to a pipettor close performance detection device. The detection device is formed by a transparent reagent bottle, a glass syringe, a right latex tube, a right three-way valve, a right glass tube, a vacuum pressure gauge, a left glass tube, a left three-way valve, a left latex tube, a liquid-absorbing nozzle and a soft rubber bottle plug. A pipettor close performance detection method of the pipettor close performance detection device is characterized by adjusting a pipettor to be detected to nominal capacity; installing the liquid-absorbing nozzle to the pipettor to be detected and screwing the liquid-absorbing nozzle tightly; carrying out connection according to the installation connection step; adjusting rotary knobs of the left and right three-way valves and extracting air with the glass syringe and repeating the operation until a pointer of the vacuum pressure gauge points to -0.04 MPa; and carrying out close performance detection of the pipettor to be detected through a closed loop formed by the pipettor to be detected, the left three-way valve, the transparent reagent bottle, the vacuum pressure gauge and the b end of the right three-way valve in sequence. The detection device solves the problems that it is troublesome and not easy to carry out the detection and efficiency is not high when carrying out close performance detection on the pipettor.

Description

technical field [0001] The invention belongs to the field of inspection and detection instruments, in particular to an inspection device for the tightness of a pipette. Background technique [0002] Pipettes are mainly used in scientific research departments such as environmental protection, medicine, and food hygiene, and are used for sampling or adding liquids in biochemical analysis and testing. It is a piston-type suction pipe, which works on the principle of air discharge, and determines the capacity of the pipette by the distance the piston moves in the piston sleeve. The tightness of the pipette refers to the relative vacuum degree of the closed space formed between the pipette piston and the transferred liquid during a complete liquid extraction and discharge process. Article 6.5 of the JJG646-2006 "Pipette" Metrology Verification Regulations has made clear general technical requirements for the tightness of the pipette. When the inspection item 7.2 stipulates "firs...

AI Technical Summary

Problems solved by technology

In fact, the accuracy of pipetting results caused by unqualified tightness is common. According to statistical analysis, as many as 80% of the accuracy problems of pipettes are caused by unqualified tightness.

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