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Guide to the correct use of laboratory electronic balance | 02 Environment
2023-03-09
temperature
Keep the indoor temperature as constant as possible. The rapidly changing temperature will have a significant impact on the weighing results.
Do not weigh near the radiator or window.
light
If possible, place the balance near the windowless wall. Direct sunlight (thermal radiation) will affect the weighing results.
Place the balance far away from the lighting device to avoid thermal radiation. Especially the light bulb. Use fluorescent tubes as much as possible.
clean
Always keep the weighing room and scale clean? Use only clean weighing containers? The balance can be cleaned with ordinary glass cleaning solution
Clean with lint-free cloth? Remove all removable parts (such as scales) before cleaning.
External influence
If the weighing display value is unstable, the result will drift slowly in the same direction. This is usually affected by bad physical factors. Common reasons include:
Influence of surrounding environment on balance
Weigh the sample for humidification or dehumidification
Weigh sample or container
Weigh sample or container
The temperature difference between the sample, weighing container, balance and the surrounding environment will be described in detail in the next chapter, as well as the factors causing these effects and possible corrective measures. The impact of air flow on the weighing problem shows that the weighing value is constantly drifting, which makes it difficult to carry out the zero return/tare operation, the stability time is too long, and the measurement accuracy is poor. Possible cause The balance is placed in a position and there is air flow in the operating environment.
Possible causes and conditions:
The balance is too close to the air conditioner exhaust, ceiling fan, window or radiator.
The balance is located in the airflow generated by the cooling fan in the laboratory equipment.
The huge temperature difference between the sample and its surrounding environment produces air flow.
The balance is located in an unprotected open area (e.g. production environment).
The balance is located in a ventilated safety hood (e.g. fume hood, safety cabinet or biosafety cabinet).
To prevent the scale from being exposed to the air flow, manual or automatic windshield can be used.
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