What is the load cell principle and does anyone know? What points to focus on

Weighing inductor is used very widely in our industrial area, at present, enterprises pay more attention to the use and installation of weighing inductor, when we choose a weighing inductor, we must first understand the working principle of the weighing inductor, so that we can choose our appropriate weighing inductor. So, how does a weighing sensor work? Today, let's take our weighing sensor manufacturers to take us to find out!

Weighing inductors convert physical signals into electrical signals for accurate measurements. Weighing inductors are also known as resistance strain gauge sensors. The weighing inductor has a simple structure, a wide measurement range and high accuracy, and can adapt to various harsh conditions.

However, the weighing sensor should be handled gently when used to avoid vibration, otherwise the measurement data will be affected. After a general understanding of the weighing inductor, let's talk about the working principle of the weighing inductor and the application range of more knowledge.

The electronic scale shows that there is no signal, the reason is that the weighing display is poorly wired, the virtual soldering, the signal line is disconnected, and the electronic scale caused by the damage of the load cell should refer to the product operation manual or contact the manufacturer to solve the problem.

exc+, exc- represents the power supply; SIG+, SIG- represent the weighing signal that is fed back.

Unstressed zero voltage u0 5mv; The range of output voltage change before and after 20min and the maximum voltage and minimum voltage change during the force process do not exceed that, i.e., uoe-u0, umax-umin; If the change of the output voltage every 5min interval during the force process does not exceed the above test standards for all output voltages in the whole test process, it means that the accuracy of the sensor meets the requirements and the performance is good; Otherwise, the sensor cannot accurately reflect the pressure, the linearity error is large, and the sensor is unqualified.

2. Load cell detection and data analysisIn traditional detection, a high-precision multimeter is usually used to measure the output voltage of the sensor, and the staff reads the meter to record the data. The biggest disadvantage is that it can only read the data of one sensor at a time, and every time the test machine is switched, the multimeter needs 3 seconds of stability time to read, and 1 second of data recording time. As a result, there is a large time error in the results, which in turn affects the judgment of qualified products.

For example, when reading U5, the No. 1 machine reads the accurate value of the No. 1 sensor when it is 5min, and when the No. 32 machine is read, the actual time has been (3s+1s) 32 channels + 5min=422s, that is to say, the U5 of the sensor on the No. 32 machine is not the voltage at 5min, but the voltage of 422s. From the 1st road to the 32nd road, a time error of 122s was generated. The automatic load cell detection system uses a multi-channel data acquisition card, which can reduce the average reading time of each output voltage to a few seconds, which solves the problem of time error slippage in the detection of the communication front system.

How the sensor works: The sensor elastomer is made of high-quality special metal material and pasted on the surface of the strain-sensitive area.

R1, R2, R3 and R4 four pieces (groups) of strain gauges, forming a Whistle bridge, when subjected to the action of external force F, the elastomer deformation, causing the strain gages R1 and R3 to be stretched, and the resistance value becomes larger; R2 and R4 are compressed, electric.

The resistance is reduced, causing the bridge to lose its balance and output a voltage signal proportional to the external force f.

Due to the advantages of high sensitivity, wide measurement range, simple circuit structure, high precision, and easy temperature compensation, the measuring bridge can well meet the requirements of strain measurement.

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Electronic scale sensors generally use voltage-excited resistive bridge structure sensors, this type of sensor is related to the output voltage at constant voltage (current) as well as linearity.

Load cells are mainly composed of elastic beams, strain gauges, adhesives, etc. When an external force is applied to the sensor, the elastic beam of the sensor will be deformed, so that the strain gauge with the elastic beam adhesive will act, and a certain amount of electricity will be output under the corresponding excitation voltage in the measurement circuit composed of the strain gauge. Typical scale load cell bridges typically use 300FL resistors.

The basic lead ends of the four-terminal sensor are: vin+, vout+ or s+, vin or e-, vout-, or the basic lead ends of the sensor are: +force, +sense, +vo, - vo, - sense, - force

The excitation power supply end of the sensor is generally connected in series with temperature compensation resistors and zero point compensation resistors.