A weighing sensor is a device that converts a mass signal into a measurable electrical signal output. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of weighing sensors. There are several styles, mainly S-type, cantilever type, spoke type, plate ring type, bellows type, bridge type, and column type.

　　When it comes to weighing sensors, many people think that this is only a sensor for measuring the weight of an object, but this is not entirely correct; it has also been applied in many fields. Weighing sensors are similar in principle to the pressure sensors previously introduced, but their shapes are different. Modern scientific and technological industries use weighing sensors everywhere. Below, we will introduce the applications and precautions of weighing sensors.

　　Weighing Sensor Applications

　　Electronic weighing instruments made from weighing sensors have been widely used in various industries, enabling fast and accurate weighing of materials. Especially with the advent of microprocessors and the continuous improvement of the automation level of industrial production processes, weighing sensors have become an essential device in process control. From the previous weight measurement of large tanks and hoppers that could not be weighed, as well as crane scales and truck scales, to the mixing and allocation of multiple raw materials in batching systems, automatic detection in production processes, and control of the feeding amount of powders and granular materials, weighing sensors have been applied. Currently, weighing sensors are used in almost all weighing fields.

　　Weighing Sensor Errors

　　1. Characteristic Errors

　　These are caused by the device itself, including DC drift values, incorrect slope, or non-linearity of the slope. After all, there will be a gap between the ideal transfer function characteristics and the actual characteristics of the device.

　　2. Weighing Sensor Application Errors

　　These are errors caused by operation, including incorrect probe placement, incorrect insulation between the probe and the measurement point, errors in the purification process of air or other gases, and errors caused by incorrect placement of the transducer.

　　3. Dynamic Errors

　　Sensors suitable for static conditions have strong damping, so the response to changes in input parameters is slow, and it may take several seconds to respond to a step change in temperature. Some weighing sensors with delay characteristics will produce dynamic errors when responding to rapid changes. Response time, amplitude distortion, and phase distortion can all lead to dynamic errors.

　　4. Insertion Errors

　　These are errors caused by changing the measured parameters when a sensor is inserted into the system. Using a transducer that is too large for the system, the system's dynamic characteristics are too slow, and excessive heat energy is self-heated in the system, all of which can lead to insertion errors.

　　5. Environmental Errors

　　The use of weighing sensors is also affected by environmental factors such as temperature, swing, vibration, altitude, and chemical volatilization. These factors are very likely to cause environmental errors.

　　Weighing Sensor Usage Precautions

　　Strain gauge weighing sensors are the most widely used type of weighing sensor. Their durability, reliability, and accuracy are unquestionable. It is precisely because of these characteristics that some troubles may be encountered during use. What should be noted when using weighing sensors?

　　1. Pay Attention to the Usage Environment

　　High temperatures, dust, humidity, highly corrosive environments, and electromagnetic field environments can all cause serious damage to and affect weighing sensors. Therefore, pay attention to the usage environment of the weighing sensor, or choose the appropriate weighing sensor under the given environment.

　　2. Prevent Overloading

　　Avoid damage to the weighing sensor caused by overloading, even if the weighing sensor has a certain overload capacity.

　　3. Circuit Connection

　　The wires leading to or from the display circuit should use shielded cables. The sensor output signal readout circuit should not be placed together with equipment that can generate interference and high heat.

　　4. Prevent Debris from Soiling the Sensor

　　Debris soiling the sensor may affect the movement and accuracy of the sensor's movable parts. Some "baffles" can be set around the weighing sensor, or the sensor can be covered with a thin metal plate.

　　5. Use Electrical Bypass

　　To avoid damage caused by welding current or lightning strikes, the sensor should use a hinged copper wire (cross-sectional area of about 50mm2) to form an electrical bypass, while avoiding strong thermal radiation.

　　6. Install a Level Gauge

　　To ensure weighing accuracy, the installation plane of the single sensor installation base should be adjusted to be level using a level gauge. To ensure that the load on each sensor is basically consistent, the installation surfaces of the installation bases of multiple sensors should be adjusted to the same level as much as possible.

　　7. Handle with Care

　　Prevent any impact or dropping of the weighing sensor; handle with care. At the same time, the base for installing the sensor should be flat, clean, have sufficient strength and rigidity, and be free of any oil film or glue film.

　　8. Prevent Certain Lateral Forces from Acting on the Sensor

　　Ball bearings, universal joints, and positioning fasteners with automatic positioning or resetting functions can be used.

　　9. The Power Cord and Control Lines Should Be Twisted Together

　　50 turns/meter. If the sensor signal line needs to be extended, a special sealed cable junction box should be used. If the signal cable is very long, consider using a cable compensation circuit with a repeater amplifier.

　　10. Electrical Connection

　　The sensor's signal cable cannot be arranged in parallel with high-voltage power lines or control lines.

　　Conclusion: This is the introduction to weighing sensors. With the advancement of technology, weighing sensors, with their performance characteristics and advantages, will be applied to more industry fields, bringing convenience to people's production and life.

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