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    Home > Active Ingredient News > Drugs Articles > Several problems that must be paid attention to in the use of weighing sensor of electronic weighbridge

    Several problems that must be paid attention to in the use of weighing sensor of electronic weighbridge

    • Last Update: 2016-08-03
    • Source: Internet
    • Author: User
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    Several problems that must be paid attention to in the use of electronic weighbridge load cells must be paid attention to in the use of electronic weighbridge In the use of electronic weighbridge, the function of load cells is omnipresent, Because the resistance strain type load cell itself is a solid, durable and reliable mechanical and electrical product, but in order to ensure the test accuracy, but the electronic weighbridge in use should pay attention to the problem, so what should be paid attention to when using the load cell? The following describes nine problems that must be noticed in the use of some load cells: 1 Try to set some "baffles" around the load cells, or even cover the sensors with thin metal plates In this way, impurities can be prevented from contaminating the sensor and some movable parts, and this kind of "contamination" will often make the movable part movement uncomfortable and affect the weighing accuracy The following methods can be used to judge whether the system has uncomfortable movement That is to say, add or reduce about one thousandth of the rated load on the scale platform to see if the electronic weighbridge weighing display device reflects, indicating that the movable part is not "contaminated" 2 All wires leading to or from the display circuit shall be shielded cables The connection and grounding point of shield wire shall be reasonable If it is not grounded through the mechanical frame, it is grounded externally, but the shield wires are not grounded after they are connected with each other, which is floating Note: there are 3 sensors connected in full parallel The sensor itself is 4-wire system, but it is replaced by 6-wire system in the junction box The output signal readout circuit of the sensor shall not be placed in the same box with the equipment with "controllable silicon, contactor, etc.", which can generate strong interference, and the equipment with considerable heat generation If this cannot be guaranteed, the barrier plate shall be set between them for isolation, and the fan shall be installed in the box The electronic circuit used to measure the output signal of the sensor shall be equipped with independent power supply transformer as far as possible, instead of sharing the same main power supply with the contactor and other equipment In the use of electronic weighbridge, several problems must be paid attention to in the load cell 3 The sensor should use hinged copper wire (cross-sectional area is about 50mm2) to form an electrical bypass to protect them from the damage caused by welding current or lightning stroke In the use of the sensor, it is necessary to avoid strong thermal radiation, especially one side 4 Electrical connection equipment (such as the signal cable of the sensor, which is not arranged in parallel with the strong current power line or control line (for example, do not put the sensor signal line and the strong current power line and control line in the same pipe) If they must be placed in parallel, the distance between them should be kept above 50cm, and the signal wire should be sheathed with metal pipe 5 Try to use structural accessories with automatic positioning (reset) function, such as spherical bearing, joint bearing, positioning fastener, etc They prevent certain lateral forces from acting on the sensor It should be noted that some of the transverse forces are not caused by mechanical installation, such as the transverse forces caused by thermal expansion, the transverse forces caused by wind force, and the transverse forces caused by the vibration of the agitator on some vessel type weighing instruments are not caused by mechanical installation Some accessories on some scales must be connected to the scale body (such as the feeding pipe of the container scale) We should make them as soft as possible in the direction of the sensor loading spindle, so as to prevent them from "eating" the real load of the sensor and causing errors 6 Handle with care, especially the small capacity sensor made of alloy aluminum elastomer Any impact or drop may cause great damage to its metrological performance For the large capacity weighing sensor, generally speaking, it has a large self weight, so it is required to use appropriate lifting equipment (such as chain block, electric hoist, etc.) when carrying and installing The mounting surface of the sensor base shall be flat and clean without any oil film or adhesive film The mounting base shall have enough strength and rigidity, which shall be higher than the strength and rigidity of the sensor 7 Although the load cell has certain overload capacity, the overload of the sensor shall be prevented during the installation of the weighing system It should be noted that even a short time overload may cause sensor * damage During the installation, if necessary, a cushion block with the same height as the sensor can be used to replace the sensor, and then the sensor can be replaced after Zui In normal operation, the sensor shall be equipped with mechanical structure parts for overload protection If the screw is used to fix the sensor, a certain tightening torque is required, and the screw should have a certain screw thread depth Generally speaking, the fixed screw adopts high-strength screw 8 In any case, the power line and control line shall be twisted to a degree of 50 R / m if the sensor signal line needs to be extended, a special sealed cable junction box shall be used If the junction box is not used, and the cable is directly connected with the cable (solder end), special attention shall be paid to the sealing and moisture-proof After the connection, the insulation resistance shall be inspected, and the standard (2000-5000m) shall be reached If necessary, the sensor shall be re calibrated If the signal cable is long and the measurement accuracy is high, the cable compensation circuit with relay amplifier should be considered 9 Horizontal adjustment: there are two aspects of horizontal adjustment One is that the installation plane of single sensor mounting base shall be adjusted by level gauge, the other is that the installation plane of multiple sensors mounting base shall be adjusted to a horizontal plane as far as possible (with level gauge), especially in the weighing system with more than three sensors, which shall be paid more attention to The main purpose of this is to make the load borne by each sensor basically consistent 。 The loading direction of each electronic weighbridge load cell is determined, and when we use it, we must load the load in this direction Transverse force, additional bending moment and torque force shall be avoided as far as possible Engineer's recommendation: the full intelligent t-touch color touch screen electronic scale is mainly composed of a single chip microcomputer as the central control unit, a 7-inch color display screen, a / D conversion unit through the weighing sensor, and a keyboard, display circuit and powerful software Equivalent to a tablet computer, the electronic scale can not only measure accurately, quickly and conveniently, but also realize automatic weighing and pricing functions, preset peeling, net / gross rotation, automatic calculation, automatic storage, automatic recording, automatic saving, automatic memory, automatic analysis, automatic statistics, external piece scanning and weighing functions, import and export data to the computer Excel format view report, read card weighing, batching and sorting products, timing record, qualified / manual / automatic printing, administrator authority operation, automatic resolution average value, multiple label printing formats, external LED large screen display, digital display and other functions are welcomed by the majority of users Intelligent electronic scale is easy to use and operate, which has more and more influence on people's life (currently one of many large groups) our hot selling recommended customers are: (battery industry super Wei Group, Beijing Kowloon power supply, tin Neng group, Hengyang Rita, etc.) (food industry Anjoy food, white elephant food, uniform, etc.) (building materials industry - China financial group, joint Plastics Group) emulsion - Yili Group and so on  
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