The precision electronic weighing balance is an indispensable instrument in quantitative analysis work. To obtain reliable analysis results, it is important to fully understand the performance of the instrument and master its usage methods. There are many types of precision balances, including regular precision balances, semi-automatic, fully automatic coded light projection damping precision balances, and electronic precision balances. Below is an introduction to the usage methods and precautions of electronic precision balances.
Check and adjust the balance to a horizontal position.
Check if the power supply voltage matches (use a voltage stabilizer if necessary) and preheat the balance for the required time as specified by the instrument.
After preheating for enough time, turn on the balance switch. The balance will automatically adjust its sensitivity and zero point. Once the stability indicator is displayed, formal weighing can be conducted.
When weighing on a precision electronic balance, place a clean weighing bottle or weighing paper on the pan, close the side door, press the tare button lightly, and the balance will automatically calibrate the zero point. Then gradually add the substance to be weighed until the desired weight is reached.
After weighing, the weighing bottle (or paper) should be removed promptly. Close the side door, turn off the power, and record the usage information.
The balance should be placed on a sturdy and stable cement or wooden platform. The indoor environment should be clean, dry, and have a relatively constant temperature. Avoid direct light exposure on the balance.
When weighing, substances should be taken or placed through the side door. Close the door when reading the measurement to prevent air flow from causing balance swings. The front door should only be used for maintenance or removing residual substances.
If a high precision electronic balance is not used for a long time, it should be preheated regularly. Preheating should be done once a week for 2 hours each time to ensure that the instrument is always in good working condition.
Moisture absorbers (such as silica gel) should be placed inside the balance box. When the moisture absorbers change color due to moisture absorption, they should be immediately replaced by high-temperature baking to ensure their moisture absorption performance.
Volatile, corrosive, strong acid and alkali substances should be weighed in covered weighing bottles to prevent corrosion of the balance.
The weighing weight should not exceed the maximum load of the balance.
Regularly perform self-calibration or periodic external calibration of the precision electronic weighing balance to ensure its normal operation.
If the balance malfunctions, do not attempt to repair it on your own. Immediately report the issue to the quality manager in the testing center.
The balance should not be moved frequently once it is properly placed. If it needs to be moved, after moving the precision electronic weighing balance, it should be calibrated and certified by the municipal metrology department before use.