Precautions for pipettes
(1) When sucking liquid, you must loosen your thumb slowly and steadily. It is never allowed to loosen it suddenly to prevent the solution from being sucked in too quickly and rushing into the liquid extractor to corrode the plunger and cause air leakage.
(2) In order to obtain higher accuracy, the tip needs to take a sample solution in advance, and then formally pipette, because when sucking serum protein solution or organic solvent, a layer of "liquid film" will remain on the inner wall of the tip, causing discharge The amount is too small to cause errors.
(3) Liquids with high concentration and viscosity will cause errors. In order to eliminate the error, the compensation amount can be determined by experiment. The compensation amount can be set by changing the reading of the reading window with the adjustment knob.
(4) An analytical balance can be used to measure the weight of the pure water taken and calculate it to calibrate the liquid extractor. 1ml of distilled water weighs 0.9982g at 20°C.
(5) The method of repeatedly hitting the pipette tip to tighten is very undesirable. Long-term operation will loosen internal parts and damage the pipette.
(6) Do not pipette when the pipette is not equipped with a tip.
(7) When setting the range, please pay attention to the “turn to the required range? The numbers are clearly in the display window, and the set range is within the range of the pipette. Do not turn the button out of the range, otherwise the mechanical device will be stuck. , The pipette is damaged.
(8) The pipette is strictly prohibited to absorb highly volatile and corrosive liquids (such as concentrated acid, concentrated alkali, organic matter, etc.).
(9) It is strictly prohibited to use a pipette to pipette and mix the liquid.
(10) Do not use a large-range pipette to pipette small volumes of liquid, so as not to affect accuracy. At the same time, if you need to pipette a larger amount of liquid outside the measuring range, please use a pipette.
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