Abstract: By briefly describing the characteristics of electronic weighing instruments and weighing display controllers, how to choose electronic weighing instruments and weighing display controllers, and how to use and maintain electronic weighing instruments and weighing display controllers.
Key words: electronic weighing instrument purchase use and maintenance weighing display controller precautions
Electronic weighing instruments are widely used in various industries because of their high-precision, multi-function, multi-purpose, convenient and fast characteristics. It is mainly used for trade settlement, and it is also a measuring instrument that the masses have the most contact with. Electronic weighing instruments are mainly non-automatic weighing instruments and automatic weighing instruments, while non-automatic weighing instruments are commonly used in the market. For example, the commonly used electronic pricing scales, electronic platform scales and electronic truck scales; automatic weighing instruments are generally more common in industrial and mining enterprises' batching scales, quantitative packaging scales, etc.
Electronic weighing instrument is mainly composed of weighing display controller, weighing sensor and electrical control and other parts. Reasonable selection of weighing display controller and weighing sensor is the key to determining the quality of the product, which determines the accuracy, reliability and reliability of the scale. parameters such as failure factor. There are a wide variety of electronic weighing instruments, and how to reasonably choose electronic weighing instruments and weighing display controllers is the most concerned issue for users.
1. About Electronic Weighing Apparatus
(1) Purchase of electronic weighing instruments
The precision grade of weighing instruments currently on the market is (III) scales, and the display division is generally 3000 divisions. Its minimum division division value is 5g). Users can choose different electronic weighing instruments according to different needs.
(1) According to the said items: items with high economic value should choose a scale with high accuracy (a 0.1mg scale should be selected for gold, and a 1/3000-precision price scale should be selected for eggs).
(2) According to the weighing used: If you often weigh dozens of kilograms of items, you can choose a 100 kilogram scale (the weight value that is often weighed should be the best in the middle of the maximum weighing). If the selection is too small, it will damage the sensor and cause unnecessary economic losses; if the selection is too large, the weighing will be inaccurate and the measurement accuracy will be affected.
(3) According to the function of use: If you need to calculate the number of items, you can choose a (table/case) scale for counting; for quantitatively packaged items, you can choose a weight (table/case) scale.
(2) The use of electronic weighing instruments:
(1) The electronic weighing instrument senses the gravity of the outside world by the load cell, and then transmits the converted electrical signal to the electronic circuit. Do not use excessive force when weighing, especially for small weighing scales. Handle the weighed items with care to avoid damage to the sensor.
(2) It is necessary to charge the battery regularly, usually about 12 hours (the time should not be too long), so that the electronic scale has a stable working voltage, so that it can improve the accuracy of weighing.
(3) Electronic weighing instruments are best used in a dry and ventilated environment (except waterproof scales), because long-term operation of sensors and electronic components in a humid environment will shorten the service life and bring you economic losses.
(4) The electronic weighing instrument uses high-calculation A/D and single-chip circuits. In order to make your weighing accurate, you should stay away from strong electromagnetic interference sources, such as (electric welding machines, electric drills, magnets, large motors) and so on.
(3) Maintenance of electronic weighing apparatus (weighing platform):
There should be no foreign objects such as stones around the weighing platform, and it is necessary to frequently check and clean whether the limit clearance is reasonable. It is strictly forbidden to carry out arc welding operations on the weighing platform to avoid damage to the sensor. There should be no accumulated water under the weighing platform. If there is, it must be cleaned up in time. The humidity will shorten the service life of the sensor and the wire, and accelerate the aging and lead to various failures. Each connection of the weighing platform should be fastened with fixing screws (painted with anti-rust paint once a year).
(4) Precautions for the use of electronic weighing instruments:
(1) When using the platform/case scale, it should be placed steadily (as horizontal as possible), and the four feet should be adjusted steadily, so that the weight will be accurate.
(2) Use it for the first time every day, preheat for a few minutes after starting the machine, observe whether there is a power loss, and whether the pressure test scale is flexible and stable.
(3) Reasonable selection of the use accuracy, because too high accuracy will make the display unstable, it is best to use the factory-set value.
(4) When using a high-precision balance, the calibration should be re-calibrated every time the position is changed. The worktable should be level and stable, and the operation should be light.
(5) After calibration, any scale should be "shut down" and then "restarted" before it can be used normally.
(6) If it is found that the empty scale is unstable, but the actual weighing is accurate, it is enough to re-calibrate the zero point. or re-weigh calibration
2. Weighing display controller
(1) Purchase of weighing display controller
1. Instrument type
According to its function, it can be divided into single-function, multi-function and special-purpose instruments. For example, Shanghai Teragang, Yaohua, Sanyi; Changzhou Toledo; Hangzhou Keli and other weighing and display controller manufacturers, the product quality of several weighing display controller manufacturers has been checked by the state and has been qualified for two consecutive years, and the quality is relatively stable; the birth symbol of new products With the increasing ability of domestic production weighing display controller, the starting point is high and the function is strong.
According to the characteristics of the output signal of the sensor, it can be connected to the sensor of the analog output signal or the sensor of the digital output signal. In addition, there is a pricing function, which has a multi-purpose meter. The single-function instruments in its series include A1---metering type, A2---counting type and so on.
2. Advantages and disadvantages of multi-function instrument and single-function instrument
Multifunctional instrument: It has strong adaptability and can be widely used in various non-automatic electronic weighing instruments and automatic electronic weighing instruments. But the software development cycle is long and the hardware support cost is high, so its manufacturing cost is high.
Single-function instrument: The software development cycle is short and the hardware is small, so its manufacturing cost is low.
3. Issues to consider when choosing an instrument
・ The choice of which type of instrument should be based on actual needs, rather than selecting as many functions as possible;
· Select the products that have obtained the production license of measuring instruments;
· All technical indicators are in line with the national standards for weighing display controllers;
· The key point is to check whether it meets the safety protection requirements;
4. Don't be intimidated by the various models of electronic platform scales, there are several conditions, you can choose them in order.
First, you need to know how many kilograms you need to weigh?
Second, what is the size requirement?
Third, ask the dealer what brand of instruments are purchased by many people?
Fourth, if there are no special requirements for instrument functions (there are many instrument functions now, but most of them are not very useful for users who are only pure counting or weighing), choose the one with less functions, so that the performance is stable and the price is low. also low. If you require special functions, you can check whether the parameters of various instruments meet your requirements.
Fifth, tell the dealer your requirements and let the dealer recommend it for you.
5. Precautions
When developing a new instrument, pay attention to the reliability of safety performance, and its technical requirements and metrology should meet the requirements of the main provisions in the OIML76 International Recommendation Document, especially in terms of anti-interference. This is a general optional inspection, but it can reflect the technical performance of the display and the normative requirements of various functions.
6. Maintenance and maintenance
Correct use and timely maintenance are the keys to prolonging the service life of the equipment. The measuring instruments must be used in the specified environment. In order to avoid innocent damage to the equipment, the operating instructions and technical instructions must be thoroughly read before operation. Only after confirmation can they be used. .