Classification, use and maintenance of electronic balances

The balance that balances the mass of the object with electromagnetic force is called an electronic balance. It is characterized by accurate and reliable weighing, fast and clear display, automatic detection system, simple automatic calibration device and overload protection.

First, according to the accuracy of the electronic balance can be divided into the following categories:
1. The maximum weighing of the ultra-micro electronic balance ultra-micro balance is 2 to 5g.
2. The weighing of micro-electron balance micro-balance is generally 3 to 50g.
3, semi-micro electronic balance semi-micro balance weighing is generally 20 to 100g.
4. Constant electronic balance The maximum weighing of such a balance is generally between 100 and 200 g.

Second, the main components of the electronic balance
1. The weighing pan is generally made of metal material and is mounted on the sensor of the balance. It is the receiving device for the weighing of the balance. Should pay attention to hygienic cleaning, do not drop the weighing pan at will.
2. The sensor is a key component of the electronic balance and is mounted below the weighing pan.
3. The position detector consists of a high sensitivity far infrared tube and a symmetrical photocell. The load on the weighing pan is converted into an electrical signal output.
4. The function of the power amplifier is to amplify the weak signal to ensure the accuracy and working requirements of the balance.
5. The low-pass filter is used to eliminate external electromagnetic interference and ensure that the output of the sensor is a constant DC voltage.
6. There are basically two types of displays: one is the display of the digital tube; the other is the liquid crystal display.
7. Balancer (Level) Used to determine the horizontal position of the balance.

Third, purchase and use precautions
1. The electronic balance should be selected to consider whether it meets the accuracy requirements of weighing from the absolute accuracy of the electronic balance (division value e). Such as a balance of 0.1mg accuracy or a balance of 0.01mg precision. Relative accuracy should not be used to describe the requirements of the equipment. For example, an electronic balance with a scale of 10mg and a maximum weight of 200g, weighing 7mg, the mass of the object is less than the division value (e). Out of accurate results. This balance is also not suitable for 10mg objects, and the results will have a large error, requiring a higher level of balance.
2. The requirement of the range of symmetry. In addition to the accuracy of the electronic balance, you should also pay attention to whether the maximum weighing meets the needs of the range. In order to maintain accuracy, it is sufficient to relax within the range of common loads.
3. The electronic balance starts to display zero point. It cannot explain that the accuracy of the balance weighing data meets the requirements, but only indicates that the balance zero stability is qualified.

Fourth, the maintenance and maintenance of the electronic balance
1. Place the balance on a stable work surface to avoid vibration, airflow and sunlight.
2. Adjust the level bubble to the middle position before use.
3. The electronic balance should be preheated according to the requirements of the manual.
4. When weighing volatile and corrosive items, place them in a closed container to avoid corrosion and damage to the electronic balance.
5, often self-school or regular external school electronic balance to ensure that it is in the best state.
6. If the electronic balance fails, it should be repaired in time.
7. The operating balance should not be overloaded to avoid damage to the balance.
8. If you do not use an electronic balance for a long time, you should temporarily collect it as well.
9. Follow the instructions and it is necessary to calibrate the balance regularly to maintain its accuracy. Factors such as storage time, location movement, environmental changes, etc. may affect the accuracy of the balance. The calibration operation of the balance can be repeated several times for better accuracy.