How do I choose an electronic balance? What data to look at? What brand is good?

First, you need to know the measurement accuracy and range you want to achieve.

Secondly, due to the error of the balance and the error caused by the measurement method, it is generally recommended that the user increase the accuracy by an order of magnitude before choosing the balance. For example, if you want to achieve an accuracy of 1 g and a maximum weight of 5 kg, you should choose a balance with an accuracy of slightly more than 5 kg.

Again, you should also choose your balance based on the other features you may need.

Finally, you should also consider the balance's appearance,** after-sales service and brand factors.

Choose 4 performance indicators for electronic balances.

To put it simply, the key to choosing a balance is to pay attention to the four performance indicators in the design and use of the balance: stability, sensitivity, correctness, and invariance.

1 Stability of the balance.

The stability of a balance refers to the ability of the balance to automatically return to its initial equilibrium position after it has been disturbed. For example, the balance position of the BL-P series precision balance is always represented by the indication value of the analog indication or digital indication, so once a certain instantaneous interference is applied to the electronic balance, although the indication value changes, the balance can return to the original indication value after the interference is eliminated, then the electronic balance is said to be stable. For an electronic balance, the stability of the balance is the primary judgment condition for the balance to be used, and the electronic balance without the stability of the balance cannot be used at all.

2 Sensitivity of the balance.

The sensitivity of a balance is the ability of the balance to detect changes in the mass of an object placed on the balance plate. The sensitivity of the balance can be expressed by angular sensitivity, or line sensitivity, or index sensitivity, or digital (indexing) sensitivity. In the case of electronic balances, it is mainly expressed by the indexing sensitivity, or the digital (indexing) sensitivity.

The smaller the mass change that can be detected by the balance, the more sensitive the balance is, which shows that for electronic balances, the sensitivity of the balance is still one of the important properties to determine the quality of the balance.

3 Correctness of the balance.

The correctness of the balance is the correctness of the balance value, which indicates the ability of the balance value to approach (conventional) true value; From the perspective of error, the correctness of the balance is the degree of systematic error that reflects the value of the balance.

For lever balances, the correctness of the balance is mainly reflected in the correctness of the balance arm ratio. However, whether it is a mechanical balance or an electronic balance, the correctness of the balance is also reflected in the correctness of the value indication of the analog or digital scale of the balance, as well as the correctness of the value indication when the load is placed at each point on the balance dial.

4 Invariance of the value of the balance.

The invariance of the balance indication refers to the degree of consistency of the measurement results obtained by the balance under the same conditions and multiple measurements of the same object.

For electronic balances, there is still the invariance of the balance indication value, such as the control of the repeatability and reproducibility of the electronic balance, the control of the zero position and return error of the electronic balance, and the control of the drift of the balance indication value of the balance at a specified time (such as 4 hours of loading) when the electronic balance is no-loaded or loaded.

It mainly depends on how much the maximum weight is needed, what the minimum reading is, and what the level of the balance is (electronic balances generally have 1 level, 2 levels, 3 levels, 4 levels, etc.). The imported brands are better than those of METTLER and Sartorius, and the domestic ones are better than those made by Shanghai Haikang Electronic Instrument Factory and Shanghai Jingke.

Sartorius is the self-proclaimed father of the world's scales. In fact, it was Dr. Ored Mettler who invented the world's first single-pan alternative balance in 1945; In 1973, METTLER introduced the world's first all-electronic precision balance, the PT1200, which sparked a technological revolution in balances around the world. In other words, it has always been METTLER that has led the technological change of the world's scales, and I really don't know how Sartorius dares to say that he is the father of the world's scales!

There are many brands of electronic balances, and the following points should be paid attention to when choosing an electronic balance:

1. Cost performance of products: to integrate the cost performance of electronic balances to avoid unnecessary waste, in the case of guaranteed product quality and product performance is basically the same, more economical and preferential ** is an important factor to effectively save unit costs.

2. Product quality and necessary additional functions: the accuracy, linearity, repeatability, four-corner error and other performance of the electronic balance should be considered. Electronic balances are the basic instruments of the laboratory, and reliable product quality is the key to product selection

3. The compatibility of the electronic balance to the operator and the tolerance of the operating code shooting environment: the personnel operating the electronic balance are different, and the techniques are not the same, and some electronic balances will have a large error

4. The average annual use cost of the product, including natural wear and tear and maintenance costs

5. Humanized design of the product: whether the product design is reasonable, whether the appearance is simple and lightweight, pleasing to the eye, and the occasional operation will cause damage to the instrument in the menu design

6. After-sales service of the product: the later service of the electronic balance is also very critical, once there is a failure in use, the manufacturer with a good reputation in the market and the first chamber of commerce to provide timely and thoughtful service.

METTLER TOLEDO offers a wide range of laboratory-specific balances and bench scales, METTLER TOLEDO analytical balances are the perfect combination of high performance, reliability and ease of use; METTLER TOLEDO precision balances are designed for reliable, high-precision weighing, not only in laboratories, but also in harsh industrial environments.

Abstract: Electronic analytical balance is a very high precision balance scale, its first is more expensive, according to the range, brand, function and other factors, an electronic analytical balance in one or two thousand yuan to four or five thousand yuan, high precision, high precision even to twenty or thirty thousand yuan. When buying an electronic balance scale, you need to comprehensively consider the measurement needs, choose the appropriate positioning type of product, and pay attention to the workmanship, accessories and performance of the electronic balance scale.

Let's take a look at how much an electronic analytical balance is. 1. How much is an electronic analytical balance?

Electronic balance is a new type of balance scale, is one of the commonly used weighing instruments in industrial and chemical laboratories, with many advantages such as fast weighing and easy to use.

The accuracy of the electronic analytical balance can be reached, it is a balance product with high precision, so it is also more expensive, according to different ranges, brands, functions, etc., from one or two thousand yuan to four or five thousand yuan a piece, some high accuracy, good quality brand products can even reach twenty or thirty thousand yuan. Precision balances or regular balances with lower accuracy** are lower.

Second, how to choose a good electronic balance scale.

Electronic balance scale is one of the commonly used measuring instruments in the laboratory, if its accuracy or quality is not good, it will directly affect the experiment, so you should pay special attention when purchasing, and pay attention to the following factors when buying electronic balances:

1. Positioning type.

Mainly to see the accuracy of the electronic balance scale, the electric spring staring balance has percentiles, thousands, and 10,000 percentiles, if there are special needs, it can be higher, mainly according to the measurement needs to choose the appropriate accuracy of the balance scale.

2. Workmanship and accessories.

First of all, look at the aesthetics of the electronic balance, including whether the connection of the balance is smooth and seamless, whether the key design is reasonable, whether the display is easy to read, whether the weighing pan is stainless steel, whether the balance frame is made of aluminum alloy, whether it is equipped with a draft shield, etc.

3. Performance. The performance of the electronic balance mainly considers the reaction speed, accuracy, repeatability, stability, etc., a good electronic balance scale requires that the zero point must be stable, and the item can be quickly returned to zero after weighing, and the display value of the item that is repeated and unchanged cannot be out of tolerance, and the results obtained by the same measurement for multiple consecutive measurements should be consistent or the error is very small.

Sartorius: Founded in 1870 in Germany, Sartorius Scientific Instruments (Beijing) is one of the world's leading brands in mechatronics, biotechnology and environmental technology.

OHAUS: The world's leading manufacturer of balances and scales for the laboratory, education, industrial and professional markets, OHAUS Instruments (Shanghai) ****. Sino-Japanese joint venture, Shanghai famous brand products, high-tech enterprises, international leading position in weighing technology for electronic industry, Shanghai Yamato weighing equipment.

Taiheng: Originated from Taiwan, founded in Taipei City in 1965, a high-tech technology enterprise dedicated to the development and production of electronic weighing instruments, Taiheng Precision Measurement and Control (Kunshan) ****. One of the world's leading and largest household electronic weighing instrument manufacturers, Guangdong Xiangshan Weighing Instrument Group Co., Ltd.

Teraoka: In 1934, Teraoka Seiko Co., Ltd., a wholly-owned enterprise of Japan, is the leading professional electronic weighing instrument company in China, a world brand, and Shanghai Teraoka Electronics.

How to choose an electronic balance.

1. When choosing an electronic balance, you should consider whether it meets the accuracy of weighing from the absolute accuracy (index value e) of the electronic balance. If you choose a precision balance or a balance of precision, you must not say that you want a balance with an accuracy of 1/10,000 or 1/100,000, because some foreign manufacturers use relative accuracy to measure the balance, otherwise the balance purchased cannot meet the needs of users. For example, in the actual work, such a situation, with an actual scale index value d of 1mg, a verification scale index value e of 10mg, a maximum weight of 200g of mettler electronic balance, used to weigh 7mg of objects, so that can not get accurate results:

In the "JJG98-90 Non-automatic Balance Trial Verification Regulations", it is stipulated that the maximum allowable error is the same order of magnitude as the graduation value "E" of the verification scale, and the maximum allowable error of this balance is 1E, which obviously cannot weigh 7mg objects; This type of balance is not the best choice for weighing 15mg objects, because the relative error of the test results will be large, and a higher level balance should be selected, and some manufacturers have specified the minimum weight value at the factory.

Therefore, we must consider the accuracy class when selecting and using electronic balances.

2. Requirements for weighing range.

In addition to its accuracy, the selection of electronic balance should also see whether the maximum weight meets the needs of the measuring range. Usually, the maximum load can be added to a small insurance factor, that is, the common load can be relaxed, not the larger the better.

Many laboratories before Lu Qingsou chose the father of the balance - Sartorius brand, the electronic balance analysis balance issued by the research institute, the difference between its function and after-sales service, are first-class, you can know the specific situation at a glance.

It's good to use a balance, but it's also good to use an electronic one, right?

In fact, there is nothing good or bad about the current market balance scale, the key is to see what kind of balance is suitable for what kind of person, what kind of balance is suitable for themselves, the sales company sells products, must say that their products are good, and they can not slap themselves, so the sales company can not blame the sales company for saying that their products are good, they can only warn themselves in the choice of electronic balances, the ability to analyze the balance, with the ability to analyze the balance, in the purchase process will not suffer a loss, in order to choose their favorite electronic balance scale. Here I will briefly talk about our common electronic balance scales. In the domestic ordinary balance is better electronic balance pen pen think that there are 2, Huazhi and Longteng, from the cost performance point of view to count Huazhi balance, the first point is Longteng, Huazhi is an American brand produced in Fujian, China, ** can adapt to many purchase acceptance categories, therefore, the author in Longteng and Huazhi is more inclined to Huazhi.

In addition, other imported electronic balances such as Mettler, Sartorius, etc., the author believes that they are not much different, and there is no big advantage compared with domestic balances, but from the above, not only the domestic brand is twice as high, or even more than 10 times higher. Of course, many buyers feel that it is expensive, but smart buyers will naturally find that they are several times higher, can the quality be several times higher? Can it be achieved for life without being bad?

If it is broken, who to repair, how much is the maintenance cost, if you buy imported electronic balances for relatively wealthy units, the author thinks that METTLER is better, but METTLER's after-sales service is not good.

Of course, compared with the domestic balance and the imported balance, the imported balance may be more refined in terms of appearance and function, in terms of precision and quality, are balance scales, since they are all balances, belonging to the national first-class scale standards, are required to be verified by the measurement department before they can be produced into the market, if they are too different from the imported ones, it is not called the national first-class scale, therefore, the author recommends that users who buy balances should choose the right balance for themselves, Balance from a hundredth of a gram of the balance to a ten-thousandth of a balance, from the minimum weight to the maximum weighing, the higher the accuracy requirements, the larger the maximum weight, the higher the comparison, therefore, before purchasing, first of all, to confirm how high the accuracy of their requirements can meet their own needs, the maximum weighing of the author thinks that it can be appropriately larger, such as the maximum weighing of 100g, the author suggests that it can be expanded to 200g, because, the maximum weighing is larger, the range of weighing varieties will be greater in the future, Even if the maximum capacity is not as large, it can also play a role in protecting the sensor and can extend the life of the electronic balance scale.

Before buying a balance, please look more and compare more, and hope that you can buy your favorite electronic balance.