How much do you know about the calibration method of glass containers?

[Zhongbo.com] The measuring instrument to be calibrated by the instrument should be cleaned and filled with distilled water according to the specified method. The measuring instrument should be dried. It can be washed with alcohol or dried with hot air. The measuring device only needs to be properly cleaned. The disposable pipette does not have to be cleaned before calibration:

(a) temperature

Instrument calibration must be performed indoors and room temperature fluctuations must not exceed 1 °C / h. Make sure that the gauge or weighing bottle and the instrument calibration water are at the same room temperature.

(2) Weighing of the measuring device

For the metering or weighing bottle to be calibrated by the instrument, the accuracy of weighing should be higher than 10% of the specified tolerance.

(3) Injection

For the metering gauge, water should be injected to a few millimeters above the calibration line of the instrument, and then the excess water should be sucked out by the suction pipe to set the indexing line, while the metering pipette is used for the filter paper. The index line is set.

For the metering type measuring device, the clamp should be placed in the vertical position and water is injected to a few millimeters above the measured index line, then the liquid droplets outside the liquid flow port are removed, and then the excess water is discharged through the liquid discharge port to set the liquid level. To the index line, the inclined receiving container is in contact with the end of the flow port to remove all droplets adhering to the flow port, and then the water is smoothly poured into a weighing bottle of known quality. In order to obtain accurate metering capacity, care must be taken to vary from gauge to meter and should be described in the product standard in the section on capacity definition.

(4) Weighing

The water-filled carrying container or weighing bottle should be accurately weighed. When calibrating, measure the water temperature with a thermometer with a graduation value of 0.1 °C. The thermometer can be placed in the water supply pipe or placed in a weighed water meter. Needs secondary weighing, ie carrying container weighing IL and empty container weighing IE is under normal conditions, IL and IE are observed under the same conditions without adjusting the exact zero of the balance, you can use single or double disk Balance. However, for a two-disc balance, a container identical to the weighing container can be placed on the opposite weighing pan. By weighing the two as the mass of the container, the two weighings should be completed in the shortest possible time to ensure weighing under the same conditions. The air temperature and atmospheric pressure of the balance chamber should also be recorded. When making this measurement, it should be done carefully and quickly to reduce the error caused by evaporation loss. The balance used should be in good working condition. The outside of the weighing device should be cleaned and carefully placed to prevent contamination. It can be cleaned with a clean cotton cloth as required and put on washed cotton gloves. take.

(5) Calculation

The difference between the load container quality IL and the empty container quality IE is the apparent mass of the meter to be metered or measured, and then the capacity is calculated according to the corresponding formula.

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