BRANDTECH SCIENTIFIC 703976 Polypropylene Single Channel Pipette Adapter for Testing Without Tip

The most frequent cause of inaccuracy in piston-operated pipettes is leakage. This arises from damage either to the seals, pistons, or tip cones. Often not detectable by the naked eye, leaks lead to significant volume errors. The BRAND pipette leak tester (PLT unit) for air displacement pipettes finds even the smallest leaks within seconds. Air-displacement pipettes must be checked at regular intervals and the results must be compared with the ISO 8655-2 error limits. However, a calibration certificate only reflects the results at the time of testing. The time between these calibrations is crucial, since leaks can occur at any time. Well over 80% of pipettes sent in for repair have leaks and are outside their volume tolerances, even if they don’t drip.

• The leak rate is determined by considering complex physical relationships
• The pV value is the product of the pressure and the volume of a certain quantity of a gas at the prevailing temperature
• The leak rate QLis the ratio of the pV value and the period of time during which the gas flows through a path cross-section
• For the pipette test, hPa ml/s is a suitable unit for the leak rate