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How Accurate Is An Electronic Balance?

Date:2020-04-23

With the development of modern experimental technology, the use of electronic balances has become more and more popular. However, due to the high price of electronic balances, some users can not meet the requirements, and electronic balances are obviously superior to mechanical balances. Their characteristics are unique design, rich use of functions, high degree of automation, fast weighing speed and so on. It plays an important role in chemistry experiment teaching. Laboratory balance supplier introduces to you:

Electronic balance is a kind of valuable instrument, which requires high use conditions, because temperature, humidity, etc. have a direct impact on electronic components. Failure to meet the requirements will directly affect the service life of the balance, and failure to maintain it in time will also affect its normal teaching work. Therefore, it is very important to do the daily maintenance and maintenance work of the electronic balance. In terms of factors that affect the life of the electronic balance, it is important to pay attention to the dustproof environment of the electronic balance installation environment, adjust the temperature, humidity, direct sunlight, and keep away from magnetic equipment to avoid corrosive gases. Regarding the importance of the maintenance of electronic balances, we have summarized several points about the maintenance and maintenance of electronic balances in the process of use. We hope that they will be applied in the actual operation process to make the life of expensive electronic balances last longer.

Classification of electronic balance

According to the structure, electronic balance can be divided into two types: upper dish type and lower blood type. Weighing the dish on the support is called the upper dish type, and weighing the dish on the support is called the lower dish type. According to the accuracy of electronic balance, it can be divided into:

1.The ultra-weigh electronic balance has a maximum weighing of 2 ~ 5g, and the scale division value is less than (maximum) weighing 10-6

2. The maximum weighing of the microelectronic balance is generally 3 ~ s50g scale division value is less than (maximum) weighing 10-5.

3. For semi-micro electronic balances, the maximum weighing is 20 ~ 100g scale division value is less than (maximum) weighing 10-5.

4. The maximum weight of the constant electronic balance is 100 ~ 200g, and the scale division value is less than (maximum) 10-5.

Although there are many types of electronic balances, their use methods are similar, and specific operations can be found in the instrument's instruction manual. Our commonly used electronic balance is the upper blood balance.

Precision Scales 0.01g

Precision Scales 0.01g

Calibration of  precision scales 0.01g

When calibrating, we must first choose dust and shock to prevent temperature fluctuations and suitable humidity. A relatively sealed room is used as a balance room. The balance should be placed on a sturdy and stable laboratory bench for easy operation. Secondly, adjust the electronic balance to a horizontal state, subject to the level. In addition, before starting to use the electronic balance, it is required to warm up for half an hour to one hour (depending on the technical requirements of the manual), so that the 0.01 gram scale can have a constant operating temperature inside, which is beneficial to the weighing process accurate. Different types of electronic balances have different calibration methods, which can be divided into internal calibration methods and external calibration methods.

1. Internal Calibration

The method is as follows: (1) First clean the balance of the electronic balance, (2) Warm up according to the instructions of the electronic balance; (3) Let the balance be stable The zero position is fixedly displayed; (4) Hold down the "aL / Menu> key until the screen displays" CRL ", then release the key; (5) When the screen briefly displays" CRLint "and" "followed by 0.00g "After that, the calibration is completed, so that the balance returns to the weighing mode and normal weighing can be performed.

2. External calibration method

First make sure that the electronic balance weighs nothing; warm up according to the instructions of the electronic balance; press the "CAL" key when the display shows zero, the calibration procedure is started, and the weight value g of the calibration code is displayed on the display; it will be ready The calibration weight is placed in the center of the weighing pan, and the electronic balance automatically performs the adjustment process.When the screen displays the weight value g of the calibration weight, and when the displayed value is stationary, the adjustment process ends; (if the calibration weight is not displayed) When the weight value g of the code is cleared again, repeat the above operation). Remove the weight from the balance pan and return the balance to zero for normal weighing.