Pipettes are commonly used in biological and chemical laboratories to remove trace liquids. The advantages are easy operation and high accuracy. With it, laboratory pipetting is no longer the main cause of analytical errors.

The functions of the pipette and the pipette are the same, with only a few differences: First, the accuracy is higher (based on compared with the old pipette, because some of the elite in the new pipette are also very accurate. ); Two, more efficient (easy to operate); three, the structure is more complicated (a pipette is a tube, and a pipette is composed of dozens of parts); four, more powerful (except for the mobile Outside the liquid, many pipettes also have many functions); five, and the most important point, the price is higher! (High-tech prices will definitely be higher.)

How pipettes work

For the so-called precision instruments, most of the time we must carefully introduce its esoteric principles, but the principle of the pipette is very simple-that is, the piston is moved up and down by the elastic force of the spring to discharge or suck liquid.

Generally speaking, there are two types of pipettes, one is an air displacement type; the other is an external piston type, which is often used as a special pipette and has a narrow application range. This type of pipette can For removing highly viscous samples.

The so-called air displacement type is to press down on the piston to push out the air inside the lower end of the pipette. When the piston is moved up, the air pressure inside the lower end of the pipette is less than the external air pressure. You can suck up the liquid. In short, the air goes out and the liquid comes in! The so-called external piston type 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 type.