I. The Use of Electronic Scales
Preheat before use. Electronic balances typically require preheating before operation, and the preheating time for each balance can vary. Generally, the higher the accuracy grade of the balance, the longer the preheating time required. Preheat according to the instructions in the balance's manual, and extend the preheating time if necessary (usually, the lower the ambient temperature, the longer the preheating time). In reality, many users simply turn on the balance and use it immediately, which cannot guarantee the balance's measurement performance. Therefore, preheating the electronic balance is a key factor in accuracy.
2. Environmental Conditions. Environmental conditions are also a critical factor affecting the measuring performance of electronic balances. If the operation manual of the electronic balance does not specify a temperature limit, the balance should operate normally within a temperature range of -10℃ to 40℃; if there is a specified temperature limit, the balance should operate within the prescribed temperature conditions. Electronic balances also have requirements for environmental humidity; for instance, a Class I balance requires relative humidity not to exceed 80%.
3. Level Status. Generally, high-precision electronic balances are equipped with a level adjustment device and a spirit level. During use, it is important to regularly check the level status of the balance. In reality, some users often overlook the inspection of the balance's level status (electronic balances may often become uneven or not level due to movement or other reasons), which is a major cause of inaccurate balance data.
4. Stay Calibrated. Some believe that electronic balances are accurate within their valid period after periodic calibration, often overlooking the importance of calibration and even failing to perform it. However, it is not realized that due to changes in environmental conditions and human factors, the measuring performance of electronic balances can experience subtle changes during use. This necessitates calibration during daily use. Electronic balances should be calibrated daily or before each use, and the frequency can be increased as necessary.
Maintaining and Caring for Electronic Scales
The room should be shielded from direct sunlight, opting for a north-facing room or using light-blocking methods. The workbench must be sturdy and level.
Stay away from sources of vibration, heat, and high-intensity electromagnetic fields, etc.
The temperature within the workroom should be constant. If no specific temperature is mentioned in the operating instructions, the balance should operate normally within a temperature range of -10℃ to +40℃, and its measurement performance should comply with the requirements of the electronic balance calibration regulations.
The optimal relative humidity in the studio should be between 45% and 75%.
The workspace should be clean and free from the influence of air currents and corrosive gases.
6. Electronic balances should not be overloaded. When moving or transporting, remove the weighing pan and its tray.
7. The external power supply for the electronic balance should match the local voltage, such as selecting the 220V or 110V slot.
When weighing volatile and corrosive substances, they should be placed in sealed containers to prevent corrosion and damage.
Remove the sample from the drying oven or refrigerator and wait until the sample temperature matches that of the weighing room before proceeding with the weighing.
10. After use, promptly clean the weighing pan and any substance within the weighing chamber with a soft-bristled brush (do not sweep into the central sensor opening). Maintain the cleanliness and dryness of the weighing chamber, ensuring it is free from dust, pollutants, and water droplets. Avoid introducing pollutants into the gaps of the balance, which may affect the sensitivity of the sensor. Regularly wipe the weighing pan and protective cover with alcohol to ensure the glass door operates smoothly.
