The principle of the resistance strain gauge weighing scale sensor is: when an external force is applied to the elastic body (elastic element, sensitive beam), it produces elastic deformation, causing the resistance strain gauge (transformation element) attached to its surface to also deform. When the resistance strain gauge deforms, its resistance value will change (increase or decrease). Then, the corresponding measuring circuit converts the resistance change into an electrical signal (voltage or current) output, thereby completing the process of converting external force into an electrical signal.
The signal line of the weighing scale sensor should not be arranged parallel to the strong electrical line or control line (such as the signal line of the sensor should not be placed in the same conduit as the strong electrical line and control line). If it must be placed in parallel, the spacing should be kept above 50CM, and the signal line should be wrapped in a metal pipe. In any case, the power line and control line should be wrapped together at a speed of 50 RPM/m.
If the signal line of the weighing scale sensor needs to be extended, a sealed cable junction box should be used. If there is no such junction box, if the cable is directly connected to the cable (welding end), special attention should be paid to the sealing container, check whether the insulation resistance is good and meet the standard, and calibrate the sensor if necessary. If the signal cable is long and high-precision measurement is guaranteed, a cable compensation circuit with a relay amplifier should be considered.
All wires entering and leaving the display circuit should use shielded cables. The connection and connection points of the shielded wire should be reasonable. If it is not grounded through the mechanical frame, it should be grounded externally, but the shielded wires should not be grounded after being connected to each other and are floating.
The output signal reading circuit of the weighing scale sensor should not have strong interference devices, and there should be a considerable amount of heat-generating equipment placed in the same casing. If it cannot be guaranteed, consider setting up a shielding isolation between them and putting a fan into the casing. The electronic circuit for measuring the output signal of the sensor should be configured with an independent power transformer as much as possible, and do not share the same equipment such as a power contactor.
The purpose of the weighing scale sensor is to convert the gravity of the measured object into an electrical signal to achieve the purpose of measurement. There are many types of weighing scale sensors:
S-type weighing scale sensor, mainly used for weighing feed and ingredients. Its advantages are easy installation, stable and reliable, and generally used in mixing stations.
Bridge-type weighing scale sensor, which is more complicated than the S-type. From the perspective of structural design, the bridge type is a double-shear structure design, mainly suitable for electronic weighing equipment such as truck scale, canned scale, car axle scale, and crane scale.
Cantilever beam-style weighing scale sensor is mainly used for single-track hanging weighing. Its structure is a cantilever shear structure, which is easy to use and has high precision.
Box-type weighing scale sensor, as the name suggests, has a shape like a small paper box, made of aluminum alloy material, and can withstand large pressure. It can be used to make hook scales.
Spoke-type weighing scale sensor, with fully sealed welding technology, has good protection against water, oil, and even harmful gases, and can be used as a standard sensor, suitable for various environments.
Through the introduction of various weighing scale sensors, we have a rough understanding of the types and uses of weighing scale sensors. There is a big difference in the purpose and price of different sensors. Only by selecting the appropriate one can we obtain data and allow weighing scale sensors to play their huge role.
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