Basic principle of Pressure Measurement Sensor

The application of Pressure Measurement Sensor in the field of mechanical automation is very important. When Industry 4.0 is widely popularized, the use of force sensors is becoming more and more widespread.

The China FSR Pressure Sensor is actually a device that converts the quality signal into a measurable electrical signal output.

The actual working environment of the China FPC Pressure Sensor should be considered when selecting the sensor. This is very important for the correct selection of the load cell. It is related to the normal operation of the sensor, its safety and service life, and the reliability and safety of the entire weighing instrument. sex.
Resistance strain gauge load cell is mainly composed of elastomer, resistance strain gauge and compensation circuit. The elastic body is the force-receiving element of the load cell, which is made of high-quality alloy steel or high-quality aluminum. The resistance strain gauge is made by corroding metal foil into a grid shape, and the four resistance strain gauges are glued to the elastic body in the structure of electric bridge. In the absence of force, the resistance values of the four resistors of the bridge are equal, the bridge is in a balanced state, and the output is zero. When the elastic body is deformed by force, the resistance strain gauge also deforms along with it. In the process of bending of the elastic body under force, two strain gauges are stretched, the metal wire becomes longer, and the resistance value increases; the other two pieces are pressed, the resistance value decreases. This causes the original balanced bridge to be unbalanced, and a voltage difference is generated at both ends of the bridge. This voltage difference is proportional to the force of the elastic body. By detecting this voltage difference, you can get the gravity of the sensor. After the voltage signal is detected by the meter and then calculated, the corresponding weight value can be obtained.
In the basic concepts and evaluation methods of the main technical indicators of the load cell, there are qualitative differences between the new and the old national standards. There are several styles such as S type, cantilever type, spoke type, plate ring type, bellows type, bridge type, column cylinder type and so on.
The load cell is divided into four-wire system and six-wire system. The difference is that the six-wire sensor has two more feedback wires (SEN+ and SEN-). These two wires are used for compensation. When the distance between the modules is far, the two wires will be compensated to make the measurement result more accurate.
The output signal of the China Force Pressure Sensor is generally 2.0mv/v, and some output 3.0mv/v. The specific output signal calculation method of the load cell is: For example, the model PLD204L4-20-50Kg, the sensitivity is 2.000mv/v. The power supply voltage is DC10V. When the loaded weight is a rated load of 50Kg, the output signal is 2.000mv/v times 10V times 1=20mv, and when the loaded weight is 25KG, it outputs 10mv.
In the automated electrical system, the signal of the load cell is generally collected by the PLC or the acquisition card. The PLC and the acquisition card collect the standard analog signal, so when using the selected load sensor, it is necessary to select the transmitter BSQ-RM to output the simulation. The display control instrument PH50-A can be selected to realize the control communication function.