For so-called precision Laboratory Consumables, the esoteric principle must be carefully introduced most of the time, but the principle of the pipette is very simple-that is, the piston moves up and down through the spring's expansion and contraction force to discharge or suck liquid.

Generally speaking, there are two types of pipettes, one is the air displacement type; the other is the external piston type, often used as a special pipette, the scope of application is relatively narrow, this type of pipette can be used For removing samples with high viscosity.

The so-called air displacement type is to press down the piston to push out the air inside the lower end of the pipette, and then when the piston moves up, the air pressure inside the lower end of the pipette is less than the external air pressure, so that under the action of external air pressure It sucked up the liquid. In short, the air goes out and the liquid comes in!

The so-called external piston is actually exactly the same as the syringe. After seeing the working process of the syringe, you can probably understand the principle of the external piston.

Pipettes are laboratory instruments commonly used in biological and chemical laboratories to remove trace amounts of liquid. The advantages are easy operation and high accuracy.

Pipette basic maintenance methods:

1. To prevent the pipette from being damaged, suspend the pipette on a special bracket when not in use, and return to the maximum range after using it on the day;

2. Use a pipette tip with a filter element for a potentially corrosive liquid, and choose a pipette (air displacement type and external piston type) that is suitable for operation;

3. Use the recommended lubricating grease on the lubricating seals, and regularly use an isopropyl alcohol solution to clean the outside/pipette end of the pipette;

4. No calibration is required after routine maintenance, only re-calibration is required when replacing or repairing the piston.