The precision pipette has five modes: pipetting mode, sample mixing mode, reverse aspiration mode, electrophoresis sample loading mode, and fractional pipetting mode. The pipette can be applied to liquids such as high-viscosity liquids, high-vapor-pressure liquids, and foaming liquids. Pipettes are widely used in clinical diagnostic laboratories, biotechnology laboratories, pharmaceutical and chemical laboratories, environmental laboratories, food laboratories.
Generally speaking, there are two types of pipettes, one is the air displacement type, which uses a built-in gas piston, and the piston is designed inside the pipette, relying on pushing air to absorb and discharge liquid, and the piston does not directly contact with the liquid , the pipette referred to is the air-displacement pipette; the other is the external piston type, which is often used as a special pipette. For the operation of liquids with relatively high viscosity or easy to generate air bubbles, the liquid dispenser is used with the liquid dispenser head, and the application range is relatively narrow. The so-called air displacement type is to press down the piston to press 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 smaller than the external air pressure, so that it can be The liquid was sucked up. In short, air goes out and 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.
Let's take a look at the cleaning of this equipment. The external cleaning of the precision pipette is relatively simple. It is recommended that users clean the outer surface of the single-channel adjustable pipette frequently. Of course, since the casing of the single-channel adjustable pipette has a certain degree of corrosion resistance, common organic solvents (such as ethanol) and cleaning agents (such as dish soap) can be used. But we must pay attention to two points: First, be sure to use paper or cloth dipped in organic solvents or detergents (all of which are collectively referred to as detergents) to wipe. Do not wipe directly with detergents to prevent the detergent from passing through a single channel. Adjust the gap on the pipette to enter the inside of the single-channel adjustable pipette; second, after wiping with detergent, use paper or cloth dipped in water to remove the residue of detergent.
Compared with external cleaning, internal cleaning and maintenance are much more complicated. Therefore, it is still recommended to have a dedicated person do this. It is of course better if the supplier can provide this service for free. Generally speaking, internal cleaning and maintenance are divided into two situations: one is regular cleaning and maintenance, usually once or twice a year (this kind of cleaning and maintenance can require suppliers to come to do it); the other is emergency The cleaning and maintenance of the pipette are things to be done immediately after the liquid is flushed into the single-channel adjustable pipette due to careless operation or the handle is blocked by clean objects (the performance of the blockage is that it cannot absorb liquid).
