Why is it very important to choose the right load cell?

The load cell (load cell) is actually a device that converts quality signals into measurable electrical signals. In the field of mechanical automation, the application of load cell (load cell) is very important. With the popularization of Industry 4.0, the application of load cell is more and more extensive.

When selecting the sensor, the actual working environment of the sensor should be considered first, which 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 even the reliability and safety of the whole weighing device. The electropositive strain type load cell is mainly composed of elastic body, electropositive strain gauge and compensation circuit. The elastic body is the stress element of the load cell and is made of high-quality alloy steel or high-quality aluminum profile. The resistance strain gauges are made of metal foil corroded into a grid shape, and the four resistance strain gauges are adhered to the elastic body in the form of electric grain structure. Under the condition of no stress, the electric brightness values of the four electric singers of the bridge are equal, and the electric cup is in an equilibrium state, and the output is fog. When the elastic body is deformed by force, the electric positive strain gauges are also deformed. During the stress bending process of the elastic body, two strain gauges are pulled out, and the metal wire becomes longer and the resistance value increases. The other two are compressed, and the peak resistance value is low, which leads to the imbalance of the original balance bridge and the voltage difference between the two ends of the bridge, which is proportional to the stress of the elastomer. By detecting this voltage difference, the gravity of the sensor can be obtained. Passing instrument

After the table is tested, the corresponding weight value can be obtained. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of weighing sensors. There are mainly S-type, cantilever type, spoke type, plate-ring type, diaphragm type, bridge type and column type. Weighing sensors are divided into four-wire sensors and six-wire sensors. The difference is that the six-wire sensor has two additional feedback lines (SEN+ and SEN-) for compensation. When the sensor is far away from the weighing module, these two lines will compensate and make the measurement result more accurate. Load cell (! The output signal of the force sensor is generally 20mv, and some output signals are 3.0mv The calculation method of the output signal of the force sensor is as follows: the model KDEV-L-C1-50kg, the sensitivity is 2000mvN, when the power supply voltage is DC1050kq, the output signal is 2.000mv/v times 10v times 1=20mv, and when the weight is 25kg, the output signal is 10mv. In the automatic electrical system, the signal of the load cell is usually collected by PLC or acquisition card, and the standard analog signal is collected by PC and acquisition card. Therefore, when using the load cell, it is necessary to choose the transmitter KDEV-B-B0 to output analog signals, or choose the display control instrument KDEV-B-40 to realize the control communication function.