How to choose a good filter element suction head?

1. You may want to try matching the pipette with the nozzle for performance test. After wetting and rinsing the filter element suction, repeat the sampling operation several times, weigh each sample, and record the reading.

2. Calculate the accuracy and precision of pipette operation according to the density of the test liquid, and convert it into volume.

3. We should choose a filter element suction head with good precision. If the pipette and pipette are not matched correctly, the tightness of the pipette and pipette is not guaranteed, making the results of each operation impossible to reproduce.

What are the main points of a good filter element suction head?

A good suction head depends on concentricity, taper, and importantly absorption.

1 taper: if the taper of the filter element suction head is good, the match with the gun is very good, and the suction will be more accurate;

2. Concentricity: Concentricity refers to the vertical circle at the nozzle and the connection between the nozzle and the straw. If it is not the same center, it means that the concentricity is not good.

3. Adsorption: adsorption is related to the material of the suction head. If the material of the suction head is not good, it will affect the accuracy of the pipette, resulting in a large amount of liquid residue or simply hanging on the wall, resulting in pipette error; So in the selection of filter element suction head to pay special attention to the above three points.