Wiring method for weighing sensors

Sensors are usually available in 4-wire and 6-wire systems.

The 6-wire system includes an excitation line positive electrode Exit+, an excitation line negative electrode Exit -, a signal line positive electrode Signal -, a feedback line positive electrode Sen+, a feedback line negative electrode Sen -, and a shielding line Shield. Actually, it contains 7 lines.

The 4-wire system includes an excitation line positive electrode Exception+, an excitation line negative electrode Exception -, a signal line positive electrode Signal+a signal line negative electrode Signal -, and possibly a shield wire Shield. Wiring method for weighing sensors

1、 The general weighing sensor is a six wire system. When connected to a four wire system, the power line (EXC -, EXC+) and feedback line (SEN -, SEN+) are shorted separately. SEN+and SEN - are used to compensate for line resistance. SEN+and EXC+are pathways, SEN - and EXC - are pathways

2、 EXC+and EXC - supply power to the weighing sensor, but due to the line loss between the weighing module and the sensor, the voltage received by the sensor will actually be less than the supply voltage. Each weighing sensor has a mV/V characteristic, and its output mV signal is closely related to the received voltage. SENS+and SENS - are actually a high impedance loop within the weighing sensor, which can feedback the actual voltage received by the weighing module to the weighing module. Assuming that EXC+and EXC - are 10V, line loss, and sensor 2mV/V, in fact, the maximum signal output by the sensor is () * 2=19mV, instead of 20mV. At this point, the internal weighing sensor will use 19mV as the maximum range, provided that the sensor must feedback the actual voltage to the weighing module through the feedback loop. Short circuit EXC+to SENS+and EXC - to SENS - on the weighing sensor, only in situations where the sensor is close to the weighing module and the voltage loss is very small, otherwise there may be measurement errors.

3： There are two types of wiring methods for weighing sensors: 4-wire and 6-wire, and there are also 4-wire and 6-wire wiring for modules or weighing transmitters. Whether to connect 4-wire or 6-wire depends on your hardware requirements. The principle is: if the sensor can connect 6-wire, it should not be connected to 4-wire. If it must be connected to 4-wire, it should be short circuited.