Method for leak-testing hand-held piston stroke pipettes and associated leak-testing apparatus

US8997552B2 · kind B2 · utility

Assignee

• BRAND GMBH & CO KG · DE

Inventors

• Rainer Feldmann · Marl, DE
• Wolfgang Ettig · Osthofen, DE

Key dates

• Filing date: Oct 20, 2010
• Grant date: Apr 7, 2015
• Expiry date: Sep 11, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01L2300/025
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for leak testing of hand-held piston stroke pipettes and a corresponding leak testing apparatus (1) for performing the method. Essential to the system is a holder (8) for the sealed connection of a pipette tip (3) to the leak-testing apparatus. A line system (9) with connecting sections of the leak-testing apparatus forms a specific connection volume. The pipette tip (3) is evacuated to a measuring pressure below atmospheric pressure. With the vacuum pump (5) disconnected and the connection volume sealed off, the pressure is measured after a specific time interval, and any possible rise in pressure is determined. An indication of the serviceability of the pipette (2) is generated from the pressure rise determined.