Because the load cell has the advantages of high measurement accuracy, good temperature characteristics, and stable operation, it is widely used in the dynamic and static measurement of various structures and the primary appearance of various electronic scales.
The load cell can choose two different input and output wiring methods: one is the four-wire connection method, the load cell of the four-wire connection method has no special requirements for the secondary appearance, and it is more convenient to use, but when the cable is long, it is simply affected by factors such as ambient temperature fluctuations;
The other is the six-wire connection method. The load cell of the six-wire connection method requires the secondary surface to be used with the reaction input interface, and the application range has certain limitations, but it is not simply affected by factors such as ambient temperature fluctuations, and has certain advantages in fine measurement and long-distance measurement.
The input and output wiring method of the load cell will affect the performance of the load cell, and the wrong use may bring measurement errors, and the four-wire and six-wire wiring methods of the load cell have their own advantages and disadvantages.
The load cell of the four-wire connection method has no special requirements for the secondary appearance, and it is more convenient to use, but when the cable is long, it is simply affected by the disturbance caused by factors such as ambient temperature fluctuations, which affects the measurement performance of the electronic scale; The load cell of the six-wire connection method requires the secondary appearance to be used with a reaction input interface, and the application range has certain limitations, but it is not simply affected by factors such as ambient temperature fluctuations, and has certain advantages in fine measurement and long-distance measurement.
The load cell should be connected to four wires or six wires, first of all, it depends on what your hardware requirements are, the principle is: the sensor can be connected to six wires, not four wires, must be connected to four wires, and must be shorted to four wires.
The general load cell is a six-wire system, when connected to a four-wire system, the power line (EXC-, EXC+) and the reaction line (SEN-, SEN+) are separated from the short circuit. SEN+ and SEN- are used to compensate for line resistance. SEN+ and EXC+ are pathways, and SEN- and EXC- are pathways.
EXC+ and EXC- supply power to the load cell, but in practice the load cell receives less voltage than the supply voltage due to the line loss between the weigh module and the load cell. Each load cell has a mV/V characteristic, and the mV signal it outputs is closely related to the received voltage, and SENS+ and SENS- are in practice a high impedance loop within the load cell, which is able to react the voltage received by the weigh module to the weigh module. On the load cell, EXC+ and SENS+ are shorted, and EXC- and SENS- are shorted, which is limited to the situation where the distance between the load cell and the weigh module is close and the voltage loss is very small, otherwise there is an error in measurement.
In the weighing equipment, the four-wire load cell is used more, if the six-wire sensor is connected to the equipment of the four-wire sensor, the positive reaction and the positive excitation can be connected together, and the negative reaction and the negative excitation are connected together. One thing to note about the signal line is that the output signal of red and white is different for the two types of sensors.
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