n modern technology and industry, the use of weighing sensors is ubiquitous because resistance strain type weighing sensors themselves are a sturdy, durable, and reliable electromechanical product. However, in order to ensure testing accuracy, there are still many issues that need to be paid attention to in use. So, what precautions should be taken when using weighing sensors? Here are some aspects that must be noted when using weighing sensors.
1.Set up some "baffles" around the weighing sensor as much as possible, or even cover the sensor with a thin metal plate. This can prevent impurities from contaminating the sensor and some movable parts, which often cause discomfort in the movement of the movable parts and affect the weighing accuracy. If the system has any discomfort in movement, the following method can be used to determine. That is, add or subtract about one thousandth of the rated load on the weighing platform to see if the weighing display instrument reflects or reflects, Indicates that the movable part is not 'contaminated'.
2.In terms of electrical connection, equipment such as signal cables for sensors should not be arranged in parallel with strong current power lines or control lines. If they must be placed in parallel, the distance between them should be maintained at least 50CM, and the signal lines should be covered with metal tubes.
3.Sensors should use hinged copper wires (with a cross-sectional area of approximately 50mm2) to form electrical bypasses to protect them from hazards caused by welding currents or lightning strikes. During sensor use, strong thermal radiation, especially on one side, must be avoided.
4.It is important to handle and handle small capacity sensors, especially those made of alloy aluminum elastomer. Any impact or drop may cause significant damage to their metrological performance. For large capacity weighing sensors, they generally have a large self weight, so it is required to use appropriate lifting equipment when handling and installing. The mounting surface of the sensor base should be flat, clean, and free of any oil film, There should be sufficient strength and rigidity in the installation base itself, which is generally required to be higher than the strength and rigidity of the sensor itself.
5.Try to use structural accessories with automatic positioning function, such as spherical bearings, joint bearings, positioning fasteners, etc. They can 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 forces caused by thermal expansion or wind force, The lateral force caused by the vibration of the agitator on certain container type scales is not caused by mechanical installation. Some scales must be attached to the scale body, and we should make them as soft as possible in the direction of the sensor loading spindle to prevent them from "eating" the true load of the sensor and causing errors.
6.All wires leading to or from the display circuit should use shielded cables. The connection and grounding point of the shielded wires should be reasonable. If they are not grounded through the mechanical frame, they should be grounded externally, but the shielded wires are not grounded after being connected to each other, which is floating. Note: There are three sensors in full parallel connection, and the sensor itself is a 4-wire system, But switch to a 6-wire connection method inside the junction box. The sensor output signal readout circuit should not interfere with devices that can cause strong interference Control silicon, contactors, and other devices that generate considerable heat should be placed in the same box. If this cannot be guaranteed, barriers should be installed between them to isolate them, and fans should be installed inside the box. Electronic circuits used to measure sensor output signals should be equipped with independent power transformers as much as possible, rather than sharing the same main power supply with contactors and other devices.
7.Although the weighing sensor has a certain overload capacity, it should still be prevented from overloading during the installation process of the weighing system. It should be noted that even short-term overloading may cause permanent damage to the sensor. If necessary during the installation process, a cushion block of the same height as the sensor can be used to replace the sensor first, and finally, the sensor can be replaced. During normal operation, Sensors should generally be equipped with mechanical structural components for overload protection. If a screw is used to fix the sensor, a certain tightening torque is required, and the screw should have a certain depth of screwing into the thread. Generally speaking, high-strength screws are used to fix the screw.
8.In any case, the power and control wires should be twisted together to a degree of 50 revolutions per meter. If the sensor signal wire needs to be extended, a special sealed cable junction box should be used. If this type of junction box is not used and the cable is directly connected to the cable (solder joint end), special attention should be paid to sealing and moisture-proof. After connection, the insulation resistance should be checked and meet the standard (2000-5000M). If necessary, the sensor should be recalibrated. If the signal cable is very long, To ensure high measurement accuracy, a cable compensation circuit with a relay amplifier should be considered.
9.Horizontal adjustment: There are two aspects to horizontal adjustment. One is that the installation plane of a single sensor mounting base should be adjusted horizontally using a spirit level. The other is that the installation surface of multiple sensor mounting bases should be adjusted to the same horizontal plane as much as possible, especially in weighing systems with more than three sensors. This should be noted, The main purpose of doing this is to ensure that the load borne by each sensor is basically consistent. The loading direction of each type of weighing sensor is determined, and when we use it, we must load in this direction. Lateral forces, additional bending moments, and torque forces should be avoided as much as possible.
Attention, if everyone strictly follows the above instructions, the measurement results of the weighing sensor will be more accurate and convenient to use. Moreover, the weighing sensor will not be easily damaged, and its lifespan and maintenance can be improved
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