Proper use and maintenance of electronic balances

1. Electronic Balances and Their Classifications People call balances that use electromagnetic force to balance the gravity of a weighed object as electronic balances. Its features are accurate and reliable weighing, fast and clear display, automatic detection system, simple automatic calibration device and overload protection. According to the accuracy of electronic balance can be divided into the following categories:
1. The maximum weighing capacity of ultra-micro electronic balance ultra-micro balance is 2 to 5 g, and its scale division value is less than (maximum) 10-6. For example, Mettler's UMT2 type electronic balance is an ultra-micro electronic balance.
2. The microbalance microbalance is generally weighed between 3 and 50g, and its index value is smaller than the (maximum) 10-5, such as Mettler's AT21 electronic balance and Sartorius' S4 electronic balance.
3, Semi-microbalance Weighing of semi-microbalances is generally between 20 and 100g, and the division value is less than (maximum) 10-5. For example, Mettler's AE50 electronic balance and Sartorius' M25D electronic day equality belong to this category. class.
4, constant electronic balance The balance of this type of weighing is generally 100 to 200g, its index value is less than (maximum) weighing 10-5, such as Mettler's AE200 electronic balance and Sartorius A120S, A200S electronic day average Belong to constant electronic balance.
5. Analytical balances In fact, electronic analytical balances are the general term for constant balances, semi-micro balances, micro balances, and ultra-micro balances.
6. Precision electronic balances These electronic balances are the collective name for the electronic balances whose accuracy class is Class II.
Second, the purchase and use of matters needing attention 1, (1) how to choose the electronic balance selection Electronic balance should be considered from the electronic balance absolute accuracy (divisional value e) to meet the weighing accuracy requirements. If you choose 0.1mg precision balance or 0.01mg precision scales, do not be able to say in general should be one ten thousandth or one hundred thousandth precision balance, because some foreign companies use the relative accuracy to measure the balance, otherwise buy The balance can not meet the needs of users. For example, in the actual work encountered such a situation, with an actual scale division value d is 1mg, test scale division value e is 10mg, the maximum weighing 200g Mettler electronic balance, used to weigh 7mg objects, This can not be accurate results: In the "JJG98-90 non-automatic balance test verification procedures," provides that the maximum allowable error and test scale division value "e" is the same order of magnitude, the maximum allowable error of this station scale is 1e, Obviously, it is not possible to weigh 7mg of objects. Weighing 15mg of objects using these balances is not the best choice, because the relative error of the test results will be very large. We should choose a higher level of balance. Some manufacturers have already Specifies the minimum weight value. Therefore, we must consider the accuracy level when purchasing and using electronic balances.
(2) Requirements for the range of symmetry In addition to seeing the accuracy of the electronic balance, it is also necessary to see whether the maximum weighing satisfies the needs of the range. Usually take the maximum load plus a little insurance factor, that is, some of the commonly used load can be relaxed, not bigger is better.
2. About the calibration of electronic balances (Be sure to read the instructions carefully before use) In the verification (testing), we found that the errors in the first measurement test of the balance are relatively large. The reason for this is that a considerable part of the instrument is at a longer interval. There is no calibration inside, and it is considered that the balance can be directly weighed by displaying the zero position. (It should be pointed out that the zero point of the electronic balance's power-on display cannot explain that the accuracy of the data weighed by the balance is in compliance with the test standard, and only indicates that the stability of the zero balance of the balance is acceptable, because it is necessary to comprehensively consider other technologies when measuring whether a balance is qualified or not. Indicator compliance). Due to longer storage time, position shifts, environmental changes, or for accurate measurements, the balance should generally be calibrated before use. The calibration method is divided into internal calibration and external calibration. In Germany, Saudi Arabia, Switzerland-made METTLER, Shanghai-made "JA" and other electronic days have calibration devices on average. If you do not read the instructions carefully before use, it is easy to ignore the “calibration” operation, resulting in a large weighing error.

Some people think that the heavier the objects weighed in the electronic balance range are, the more damage they will have to the balance. This understanding is not entirely correct. The maximum safe load of an instrument is the maximum static load that it can withstand without causing permanent changes in its metering performance. Since the electronic balance uses the principle of electromagnetic force automatic compensation circuit, when the weighing pan is loaded (be careful not to exceed the weighing range), the electromagnetic force will push the weighing pan back to the original equilibrium position, so that the electromagnetic force and the gravity of the object being called Balance, as long as the size of the scale within the allowable range has little effect on the balance, it will not affect the accuracy of the electronic balance due to long-term weighing.
Third, the maintenance and maintenance of electronic balances 1, the balance placed on a stable work table to avoid vibration, airflow and sunlight.
2. Adjust the bubble of the spirit level to the middle position before use.
3. The electronic balance should be warmed up according to the instructions.
4. When weighing volatile and corrosive articles, place them in closed containers to avoid corrosion and damage to the electronic balance.
5. Always conduct self-school or regular out-of-school education on electronic balances to ensure that they are in the best condition.
6, if the electronic balance failure should be promptly repaired, not with "disease" work.
7. Do not overload the operating balance to avoid damage to the balance.
8, if the long-term use of electronic balance should be temporarily collected as well.

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