Selection of electronic scales

Time:2021-06-12 00:00:00

How to choose electronic weighing instrument reasonably:


The convenient use of electronic weighing instruments has spread throughout various industries and has been widely used. It not only has high-precision measurement, but also realizes multi-function and multi-purpose. At present, there are hundreds of domestic manufacturers of electronic weighing instruments, mainly non-automatic weighing instruments and automatic weighing instruments. Electronic weighing instruments have entered the period of self-development and design from the past imported technology, especially the development of weighing display controllers for non-automatic weighing instruments has advanced by leaps and bounds. Weighing instruments are divided into two categories: automatic weighing instruments and non-automatic weighing instruments, while non-automatic weighing instruments are commonly used in the market. It is mainly used in trade settlement, and it is also the electronic weighing instrument with the most contact with the masses, such as 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 factory's products, which determines the accuracy and reliability of the scale. and parameters such as failure factor. How to reasonably choose electronic weighing instruments and weighing display controllers is the most concerned issue for users.


1. Selection of Weighing Instruments The accuracy grade of weighing instruments currently on the market is (III) scales, and the display division is generally 3000 divisions, and the minimum division value varies from 1g to 50kg according to the size of the weighing scale, (for example, A 15 kg electronic pricing scale has a minimum division value of 5g). When purchasing: For example, take a 15 kg electronic pricing scale as an example;


1. In the empty scale state and the maximum weighing state, the numbers are displayed steadily (without blinking);


2. Use one-third of the maximum weighing weight (or something close to this value) to place it within 1/4 of the scale table (divide the scale table into 4 equal parts) to test whether the numbers of each point are consistent;


3. If conditions permit, take the standard weight with the maximum weighing capacity and place it on the scale table to test its accuracy;


4. Take the standard weight close to the maximum weighing capacity (or a weight close to this value) and load it 3 times to test whether the numbers are consistent;


5. Press each function key to test whether each function key is in good contact and whether it achieves its purpose;


2. Purchase of weighing display controller


1. Instrument types According to their functions, there are single-function, multi-function and special-purpose instruments. Such as Shanghai Teragang, Yaohua, Sanyi; Changzhou Toledo; Hangzhou Keli, etc. The product quality of several weighing display controller manufacturers has been inspected 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 sensor output signal, it can be connected to a sensor with an analog output signal or a sensor with a digital output signal. In addition, it has 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 Multi-function 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 less, so its manufacturing cost is lower. Dedicated meter; manufacturing cost is between single-function and multi-function. In terms of use failure rate, the multi-function is higher in comparison.


3. Issues to consider when choosing an instrument


a. The choice of which type of instrument should be based on actual needs, rather than selecting as many functions as possible;


b. Select the products that have obtained the production license of measuring instruments;


c. All technical indicators are in line with the national standards for weighing display controllers;


d. The key point is to check whether it meets the safety protection requirements;


4. Dynamics of weighing display controller at home and abroad The instruments currently developed and produced in China are generally only equipped with one scale, while the instruments produced abroad can be equipped with multiple scales at the same time. Its software functions and hardware support can be shared, which relatively reduces manufacturing costs and management costs in use.


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 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 user manual and technical instructions must be thoroughly read before operation. After that, it can be used.