An analytical balance is an indispensable instrument for quantitative analysis. Full understanding of the instrument's performance and proficiency in its use is a guarantee of reliable analytical results. There are many types of analytical balances, including ordinary analytical balances, semi-automatic/automatically-encoded electro-optical projection damping analysis balances, and electronic analysis days. The use of electronic analytical balances and precautions are described below.
1. Check and adjust the balance to the horizontal position.
2. Check in advance whether the power supply voltage matches (regulate the voltage regulator if necessary) and preheat the power to the required time as required by the instrument.
3. After switching on the balance switch after enough warm-up time, the balance automatically adjusts the sensitivity and zero point. After the stability flag is displayed, it can be officially weighed.
4. When weighing, put a clean weighing bottle or weighing paper on the weighing pan, close the side door, press the peeling key lightly, the balance will automatically calibrate the zero point, and gradually add the material to be weighed until the required weight.
5. The weight of the substance being weighed is the actual value displayed on the display screen when the “→†mark appears in the lower left corner of the display.
6. At the end of the weighing, the weighing bottle (paper) shall be promptly removed, the side door shall be closed, the power shall be cut off, and the use registration shall be made.
Precautions
1. The balance should be placed on a solid and stable cement bench or wood bench. The room should be clean, dry and have a relatively constant temperature. At the same time, the light should be avoided from reaching the balance.
2. When weighing, the material should be taken from the side door, and the door should be closed when reading to prevent the air flow from causing the balance to oscillate. The front door is only used when overhauling or removing residual substances.
3. If the electronic analytical balance is not used for a long period of time, it should be energized and warmed up periodically, once per week, each preheated for 2 hours to ensure that the instrument is always in good condition.
4. A moisture absorption agent (such as silica gel) should be placed inside the balance box. When the moisture absorption agent absorbs water and changes color, it should be immediately replaced by high-temperature baking to ensure moisture absorption performance.
5. Volatile, corrosive, strong acid and strong base substances should be weighed in a weighing bottle with lid to prevent corrosion balance.
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