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Electronic balance for weighing object quality. Electronic balances generally use strain sensors, capacitive sensors, electromagnetic balance sensors. Strain sensors, simple structure, low cost, but the accuracy is limited.
Electronic balances and their classification can be divided into the following categories according to the precision of electronic balances: 1. Ultra-micro electronic balances: The maximum weighing of ultra-micro balances is 2 to 5 g, and the scale division value is less than (maximum) 10 - 6, such as Mettler's UMT2 type electronic days are ultra-micro electronic balance. 2. Microbalances: Weighing of microbalances is usually between 3 and 50g, and the indexing value is less than (maximum) 10-5, such as Mettler's AT21 electronic balance and Sartorius' S4 electronic balance. 3. Semi-micro balances: Semi-micro balances are generally weighed between 20 and 100 g, and their graduations are smaller than the (maximum) 10–5. Such as Mettler’s AE50 electronic balance and Sartorius’s M25D electronic day equal class. 4. Constant electronic balance: The maximum weighing of this type of balance is generally between 100 and 200g, and the scale value is smaller than the (maximum) weighing 10-5, such as Mettler's AE200 electronic balance and Sartorius' A120S, A200S electronic days. The average is a constant electronic balance. 5, analytical balance: In fact, electronic analytical balance, is a general balance, semi-micro balance, micro balance and ultra-micro balance. 6. Precision electronic balances: These electronic balances are collectively known as the electronic balances whose accuracy level is Class II.
When purchasing the balance, the user needs to understand several main technical parameters: 1. Full weighing: The maximum mass value (full load value) that the balance can weigh, often expressed in units of grams (g). 2. Sensibility: The maximum mass required to turn the balance pointer from the balance position to the dial one degree. Therefore, sentimentality is also called divisional value and is usually expressed in milligrams (mg). The smaller the value, the more sensitive the balance will be. 3. Unequal arm ratio: refers to the maximum value of the weighing error caused by the two arms of the beam (the distance from the knife edge to the left and right knife edges), often in units of milligrams or divisions. Sometimes it is also called deviation. 4.Variability: refers to the balance after balance, due to several times the beam system ups and downs, causing the maximum deviation of the pointer before and after the equilibrium position, often in milligrams or divisions as a unit. This is a parameter that marks the stability of the balance. 5. Balance level: According to China's current standard, according to the ratio of the nominal balance of balance and the balance of the balance, divided into 10 levels. 6. Tourcode scale error: Refers to the quality measured by the tour code dialed to the position of each ruled line of the ruler, and the maximum mass error of the corresponding standard weight. Also known as rider yardage error or rider error. 7. Nominal value and verification value: The specifications of the various balances are marked with the above six technical parameters. These six technical parameters are indicators that comprehensively measure the measurement performance of the balance, but do not reflect the actual conditions of the balance measurement performance. Therefore, it is called a nominal or nominal value. The actual performance of the balance measurement performance must be verified according to the prescribed procedures before calculating the verification value. After the balance is newly purchased or repaired, the test value shall not exceed the nominal value (to be exact, it shall be the nominal level); some indicators of the balance in use (such as unequal arm) may be slightly Relax some. The operation method of the electronic balance is simple, the user who purchases for the first time can operate with reference to the manual, generally does not need the professional to install and debug.