Purchase and Maintenance of Pipette

Product performance: the accuracy and repeatability of the pipette

For the vast majority of users, testing product performance before purchase is both difficult and unnecessary. Therefore, it is mainly based on technical data provided by the manufacturer. But here are two things to explain: First, don’t easily believe the seller’s verbal commitment, be sure to check the written materials provided by the manufacturer; second, the brands that have a greater impact on the global pipette market, the technology they provide data is more credible.

Reliable and durable products

This aspect depends primarily on the materials used in the pipette. For the outer casing, it should have high impact resistance, corrosion resistance, and low thermal conductivity (such as PVDF material); for pistons, there are mainly stainless steel, ceramic and plastic materials on the market. Stainless steel has good mechanical properties and long service life, but it is not suitable for pipetting strong acids and alkalis; ceramics have high corrosion resistance, but mechanical properties are poor. Of course, quality materials often mean higher prices, so you need to consider the factors of purchase price and longevity.

Ergonomic design of the product

The main points can be considered as follows:

First, the movement distance of the thumb to complete a pipetting cycle is short, which means that the comfort is higher;

Secondly, the pipette of the same range is required to complete one discharge (must be pressed to the end). The force of the thumb is the key to affecting comfort. The less force means the lower the risk of finger damage caused by long-term use;

Third, the more convenient the loading and unloading of the tip, the better the labor;

Fourth, the weight of the pipette is moderate. Excessive weight will increase the burden on the hand, but too light will often mean that the material may be unsatisfactory;

Fifth, other auxiliary designs, such as the matte design of the shell and the finger hook design, help to further improve comfort.

Pipette Maintenance Introduction

1. Disassembly of the dripper ejector sleeve: Gently hold the dripper ejector, insert the special tool provided with the manual pipette, lock the mechanical structure, carefully relax the drip ejector, and remove the dripper discharger and dripper ejector sleeve.

2. The removal of the drip cone: with a special tool equipped with a manual pipette, use the wrench end in the counterclockwise direction, and carefully loosen the drip cone; for the 5ml manual pipette, by hand counterclockwise direction, carefully loosen the drip cone.

3. Disassembly of each component: Remove the drip cone, the suction piston, and the spring. If a filter is installed, remove the filter. Immersed and disassembled parts: the drip cone, the dripper ejector, the dripper ejector ferrule and the suction cylinder piston, the O-ring, and the spring are placed in a beaker containing the Biore Bioline disinfectant. Soak for at least 30 minutes.

4. Dry and disassembled parts: take the drip cone, dripper ejector ring, and suction tube piston out of the beaker, rinse repeatedly with distilled water, then dry, preferably with hot air for at least 1 hour.

Care and installation of the components: Re-apply the lubricant to the suction cylinder piston as required in the operating manual, inspect other components, and replace consumable parts, such as replacing the new filter. Reassemble the electronic pipette in the reverse order of the above.

Note: When the electronic pipette is cleaned and biologically disinfected as usual, pay attention to checking the possible wear of the O-ring, at least once every six times, if necessary, must be replaced, and after replacement, The electronic pipette must be calibrated.