1. Overall Conversion Logic: Convert Weight Force into Readable Electrical Signals 整体转换逻辑：将重量外力转化为设备可读电信号
A complete weighing system realizes multi-stage conversion: external force → mechanical deformation → resistance variation → voltage signal → standard industrial signal. The core components include elastic body, resistance strain gauge and Wheatstone bridge circuit.
一套完整称重系统完成多级转换：外力→机械形变→电阻变化→电压信号→标准工业信号，核心三大部件为弹性体、电阻应变片、惠斯通电桥。
Step 1: Elastic Body Deforms Under Force to Change Strain Gauge Resistance 第一步：外力令弹性体形变，应变片电阻随之改变
The elastic body is the metal main body of the load cell. When weight applies pressure, the metal produces micro-scale tiny deformation. Multiple resistance strain gauges are pasted on the surface of the elastic body and stretch or compress synchronously with the metal.
弹性体是传感器金属主体，重物施压时金属产生微米级微小形变；弹性体外表面粘贴多枚电阻应变片，会跟随金属同步拉伸或压缩。
Fixed resistance variation rules 电阻变化固定规律：
- Tension zone: The strain gauge stretches, the metal wire becomes longer and thinner, so resistance rises. 拉伸区：应变片被拉长，金属丝变长变细，电阻数值增大；
- Compression zone: The strain gauge shrinks under squeeze, the metal wire becomes shorter and thicker, so resistance drops. 压缩区：应变片受挤压收缩，金属丝变短变粗，电阻数值减小。
Step 2: Wheatstone Bridge Converts Tiny Resistance Difference into Voltage Signal 第二步：惠斯通电桥将微弱电阻差值转化为电压信号
Four strain gauges are symmetrically connected to the full Wheatstone bridge in a “2 tension + 2 compression” layout.
四片应变片以「两拉两压」对称结构接入全桥惠斯通电桥电路。
Two core functions of the bridge 电桥两大核心作用：
- Amplify weak signals: Resistance changes of tension and compression gauges superimpose oppositely, doubling output voltage and greatly improving weighing sensitivity. 放大微弱信号：拉伸、压缩应变片的电阻变化反向叠加，输出电压幅度翻倍，大幅提升检测灵敏度；
- Offset temperature interference: Four strain gauges share the same ambient temperature, so resistance drift caused by temperature cancels each other out and reduces weighing error. 抵消温度干扰：四片应变片处于相同环境温度，温度引发的电阻漂移相互抵消，降低称重误差。
Under external force, the circuit outputs tiny differential voltage \(V_{OUT}\), the original electrical signal carrying weight data.
在外力作用下，电路两端输出微小差分电压\(V_{OUT}\)，这是承载重量信息的原始电信号。
Step 3: Transmitter Conditions Signals to Output Standard Industrial Signals 第三步：变送器调理信号，输出标准工业电信号
The raw differential voltage from load cells is too weak for direct reading by PLC or industrial controllers, so a force transmitter is required for signal processing.
传感器原生差分电压幅值极小，无法直接被 PLC、工控设备读取，需搭配测力变送器完成信号处理。
Full processing flow of transmitter 变送器完整处理流程：
Differential voltage input → electrical isolation → signal amplification → noise filtering → A/D analog-to-digital conversion
差分电压输入 → 电气隔离 → 信号放大 → 杂波滤波 → A/D 模数转换
After processing, the transmitter outputs standardized industrial signals, common types as follows:
信号处理完成后，变送器对外输出标准化工业信号，常见类型分为：
- Analog signals 模拟量：0~10V voltage, 4~20mA current 0~10V 电压、4~20mA 电流；
- Digital signals 数字量：RS485 communication signal RS485 通讯信号。
Complete wiring connection 整套接线链路：
Weighing load cell → force transmitter → DC power supply → PLC industrial controller
称重传感器 → 测力变送器 → 直流供电电源 → PLC 工控设备，实现重量数据采集。
2. Core Nature of Weighing Load Cell 称重传感器核心本质
The weighing load cell is a multi-stage energy conversion component, with the conversion chain as below:
称重传感器是多级能量转换元器件，完整能量转换链路：
External force (weight) → metal elastic deformation → strain gauge resistance variation → differential voltage → standard digital/analog electrical signal
外力（重量）→ 金属弹性形变 → 应变片电阻变化 → 差分电压 → 标准数字 / 模拟电信号
As the core sensing component of industrial and commercial weighing equipment, it is widely applied in weight detection and force measurement scenarios.
作为工业、商用称重设备核心感知元件，广泛应用于重量检测、力值测量场景。