Classification and principle of weighing load cell

Classification and principle of weighing load cell

1:According to the measured physical quantity, the common sensors weighing load cell are as follows:

Temperature sensor weighing load cell, humidity sensor, pressure sensor, displacement sensor, flow sensor, liquid level sensor, force sensor, acceleration sensor, torque sensor, etc.

2: According to the working principle, it can be divided into three parts

2.1:Electrical sensor is a kind of sensor weighing load cell widely used in non electrical measurement technology, including resistance sensor, capacitance sensor, inductive sensor, magnetoelectric sensor and eddy current sensor.

The resistance sensor weighing load cell is made of the principle that the rheostat converts the measured non electric quantity into resistance signal. Resistance type sensors generally include potentiometer type, contact variable resistance type, resistance strain gauge and piezoresistive sensor. The resistance sensor is mainly used for the measurement of displacement, pressure, force, strain, torque, air flow velocity, liquid level and liquid flow.

The capacitive sensor weighing load cell is made of the principle of changing the capacitance by changing the geometric size of the capacitance or changing the property and content of the medium. It is mainly used for the measurement of pressure, displacement, liquid level, thickness, moisture content and other parameters.

The inductive sensor weighing load cell is made of the principle of changing the inductance or mutual inductance or piezomagnetic effect by changing the geometry size of magnetic circuit and the position of magnet. It is mainly used for the measurement of displacement, pressure, force, vibration, acceleration and other parameters.

Magnetoelectric sensor weghing load cell is made by using the principle of electromagnetic induction to convert the measured non electric quantity into electric quantity. It is mainly used for the measurement of flow, speed and displacement.

Eddy current weighing sensor load cell is made of the principle that the metal moves in the magnetic field, cuts the magnetic line of force and forms eddy current in the metal. It is mainly used for displacement and thickness measurement.

2.2:Magnetic sensor load cell

The magnetic sensor is made of some physical effects of ferromagnetic materials, which is mainly used for the measurement of displacement, torque and other parameters.

2.3:Photoelectric sensor load cell

Photoelectric sensor plays an important role in non electric measurement and automatic control technology. It is made of the photoelectric effect and optical principle of photoelectric devices, and is mainly used for the measurement of light intensity, luminous flux, displacement, concentration and other parameters.

2.4:Potential sensor load cell

The potential sensor is made of thermoelectric effect, photoelectric effect and Hall effect. It is mainly used for the measurement of temperature, magnetic flux, current, velocity, light intensity, thermal radiation and other parameters.

2.5:Charge sensor load cell

The charge sensor is based on the principle of piezoelectric effect, which is mainly used for the measurement of force and acceleration.

2.6: Semiconductor sensors load cell

Semiconductor sensor is made of the piezoresistive effect, internal photoelectric effect, magnetoelectric effect of semiconductor, and the material change caused by the contact between semiconductor and gas. It is mainly used for the measurement of temperature, humidity, pressure, acceleration, magnetic field and harmful gas.

2.7:Resonant sensor load cell

Resonant sensor is made by changing the inherent parameters of electricity or machinery to change the resonant frequency, which is mainly used to measure pressure.

2.8:Electrochemical sensors load cell

Electrochemical sensors are made on the basis of ionic conductivity. According to the formation of their electrical characteristics, electrochemical sensors can be divided into potential sensors, conductivity sensors, electrical sensors, polarographic sensors and electrolytic sensors. Electrochemical sensors are mainly used to analyze the composition of gas, liquid or solid dissolved in liquid, and measure the pH, conductivity and redox potential of liquid.