Wiring of weighing instrument
Weighing instrument is a device that transforms quality data signals into electronic signals. It is a kind of force-sensitive sensor. The use of weighing instruments is very common, especially in weighing equipment, which is the heart of weighing equipment. At this stage, there are many types of weighing instruments on the sales market, such as resistor strain type, optical type, oil pressure type, capacitance sensor, magnetic force type, etc. Each type has its own characteristics and its application is also different. . There are two types of weighing instruments, four-wire system and six-wire system. At present, the four-wire system is commonly used in the market. Four-wire system: EXC+, EXC-: power plug, which provides the DC stabilized power supply for the sensor. Cangzheng weighing instrument EXC+ is bright red, EXC- is gray-black. SIG+, SIG-: The power cord, that is, the power cord output by the sensor, generally outputs mV data signals, depending on the working standard voltage and the sensitivity of the sensor. Cangzheng weighing instrument SIG+ is emerald green, SIG- is milky white. Six-wire system: In addition to the four wires, there are two more wires than the four-wire system: SEN+, SEN-: feedback lines, that is, the sensor will feedback the specific working voltage value to the weighing instrument. In addition, the four-wire and six-wire sensors have shielded cables: the difference between SHIELD: the four-wire weighing instrument is used in places where the distance between the weighing instrument and the weighing instrument is close, and the specified route is used. The voltage loss is very small; the six-wire system is used in places where it is accurately measured at a long distance, and its anti-interference ability is strong. Under normal circumstances, the weighing instrument is compatible with four-wire and six-wire sensors. But when wiring the four-wire sensor, use the power line to connect EXC+ and SEN+, EXC- and SEN- at the weighing instrument side. The data signal output of the weighing instrument is a millivolt data signal, which is relatively weak. The full-scale output of the weighing instrument u003d working standard voltage * sensitivity. Generally, it must cooperate with smart transmitters (amplifiers) or digital When the display instrument is working, the wiring method of the sensor is marked on the smart transmitter and the instrument panel.
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