A load cell is a device that converts a mass, weight or force signal into a measurable electrical signal. Its working principle mainly involves the sensing element, the transforming element and the measuring element. The following are the main components of a load cell:

Sensors: Directly sense the mass being measured and convert it into other measurable quantities. For example, the elastomer of a resistive strain gauge load cell converts mass into deformation, while the elastomer of a capacitive load cell converts mass into displacement.

Conversion element: The output of the sensor is converted into a signal for easy measurement. For example, the resistance strain gauge (or resistance strain gauge) of a resistance strain gauge load cell converts the deformation of the elastomer into a change in resistance, while the capacitor of a capacitive load cell converts the displacement of the elastomer into a change in capacitance.

Measuring element: Converts the output of the transforming element into an electrical signal for further transmission, processing, display, recording or control. For example, the bridge circuit in the resistance strain type load cell, and the charge preamplifier of the piezoelectric load cell.

Auxiliary power supply: provides energy for the sensor's electrical output. Generally, load cells require an external power supply to work. Therefore, the product must indicate the power supply requirements, but the auxiliary power supply itself is not part of the load cell. Some sensors, such as magnetoelectric speed sensors, can work normally without an auxiliary power supply because of their large output energy.

There are various types of load cells, which are divided into S-type, cantilever type, spoke type, plate and ring type, diaphragm type, bridge type and cylinder type according to the structure. According to the conversion method, it can be divided into photoelectric type, hydraulic type, electromagnetic force type, capacitive type, magnetic pole variable form, vibration type, gyro ceremony and resistance strain type, which is the most widely used resistance strain type.

The working principle of the resistance strain gauge weighing sensor is that the elastic body (elastic element, sensitive beam) produces elastic deformation under the action of external forces, resulting in the resistance strain gauge (conversion element) pasted on its surface also deforms. After the deformation of the resistance strain gauge, its resistance value changes (increases or decreases), and then through the corresponding measurement circuit processing, you can get an electrical signal output proportional to the measured mass.

Weighing sensors are widely used in various weighing equipment, such as electronic scale, weighbridge, hook scale and so on. It not only plays a key role in industrial production, but also plays an important role in many fields such as logistics, warehousing, and retail. The correct selection and use of the load cell is crucial to ensure the reliability and safety of the weighing device.