Ten considerations for mechanical installation of load cells1

A load cell is actually a device that converts a mass signal into a measurable electrical output. During the installation and use of the sensor, the working environment of the sensor, the installation method of the sensor and the maximum load of the sensor will all affect whether the sensor and even the entire weighing instrument can work normally, as well as its safety and service life. The following is a list of ten points to pay attention to during the mechanical installation of the load cell, hoping to help everyone. 1. The mounting surface of the base on which the load cell is installed should be flat and clean, without any oil film, glue film and other debris. The mounting base itself should have sufficient strength and rigidity, generally higher than the strength and rigidity of the sensor itself. 2. The load cell should be handled with care, especially the small range sensor whose elastomer material is aluminum alloy. Any impact or drop may cause irreparable damage to its measurement performance. For large-capacity load cells, in general, it has a large self-weight, so it is required to use appropriate lifting equipment (such as chain hoists, electric hoists, etc.) as much as possible during handling and installation. 3. The loading direction of each load cell is determined. When the sensor is used, the load must be loaded in this direction. Lateral forces, additional bending moments, and torque forces should be avoided as much as possible. 4. Level adjustment: There are two aspects of level adjustment. One is to adjust the level of the installation plane of the single sensor mounting base with a spirit level. On the other hand, the mounting plane of the mounting base of multiple sensors should be adjusted to a horizontal plane as much as possible (with a spirit level), especially if the number of sensors is more than three More attention should be paid to this point in the weighing system, the main purpose of this is to make the load borne by each sensor basically the same. Make the measurement of the weighing instrument more accurate, and the use of the sensor is also safer. 5. Some 'baffles' should be set around the load cell as much as possible, or even cover the sensor with a thin metal plate. This can prevent debris from contaminating the sensor and some movable parts, and this 'contamination' often makes the movable parts uncomfortable and affects the weighing accuracy. 6. Try to use structural accessories with automatic positioning (reset) function, such as spherical bearings, joint bearings, positioning fasteners, etc. They prevent certain lateral forces from acting on the sensor. It should be noted that some lateral forces are not caused by mechanical installation, such as lateral force caused by thermal expansion, lateral force caused by wind, and lateral force caused by the vibration of the agitator on some container weighing instruments, that is, not caused by mechanical installation. . 7. Some weighing instruments have accessories that must be connected to the scale body (such as the conveying pipe of the container scale, etc.), we should make them as soft as possible in the direction of the sensor loading spindle to prevent them from 'eaten' the sensor. Error caused by the actual load. 8. Although the weighing sensor has a certain overload capacity, the overloading of the sensor should be prevented during the installation process of the weighing system. It should be noted that even a short-term overload may cause permanent damage to the sensor. During the installation process, if necessary, replace the sensor with a spacer that is the same height as the sensor, and then replace the sensor at the end. During normal operation, the sensor should generally be equipped with mechanical structural parts for overload protection. 9. Whether the system is uncomfortable with movement can be judged by the following methods. That is, add or subtract about one thousandth of the rated load on the weighing platform to see if the weighing indicator has a response. If there is a response, it means that the movable part is not 'contaminated'. 10. If the sensor is fixed with a screw, a certain tightening torque is required, and the screw should have a certain depth of screw thread. Generally speaking, the fixed screw is made of high-strength screw. Guangdong Kenwei Intellectualized Machinery Co.,LTD.https://www.kenweigh.com/ is the leading brand and main manufacturer of automatic weighing and testing equipment in China: the main products are automatic checkweighers, weight classifiers, automatic weighing machines, weight Testing machine, packaging machine, multi-head scale, linear scale, etc., leading domestic technology, sales hotline +86-0760-22629231

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