Correct wiring method of liquid level sensor

Knowing the wiring method of the liquid level sensor can reduce the error of the liquid level sensor during operation, otherwise it will easily lead to the damage of the liquid level sensor and affect the accuracy of the measurement. The following describes how to wire the level sensor. The liquid level sensor is a common sensor that measures the liquid level position. It converts the height of the position into an electrical signal for output. The liquid level sensor is a module circuit, and the general output signal is current 4-20MA, 0-20MA, or voltage 0-5V, 1-5V, 0-10V, 24V, etc. Usually the current type is two-wire or four-wire, three-wire output. If the 10V DC power supply cannot be driven, an external power supply of 24VDC is required. In this way, the liquid level sensor has four terminals: power supply +, power supply -, feedback + and feedback -. The current type two-wire connection method of the liquid level sensor wiring: power supply +== power supply +; signal + = feedback +, power supply - = feedback-, if it is not remote transmission, only need to connect 24V voltage +, -, if you need remote transmission The transmission needs to form a circuit, for example, 24V+ is connected to pressure gauge+, pressure gauge- is connected to 4-20mA+, and 4-20mA- is connected to 24V-. There may be terminals in the middle. Please see the circuit diagram. The voltage type three-wire wiring method of the liquid level sensor wiring: power supply+==power supply+; power supply-(signal-)==power supply-; signal+==feedback+, power supply-(signal-). The four-wire wiring method of liquid level sensor wiring: power supply +== power supply +; power supply -== power supply -; signal +== feedback +, signal -== feedback-. The principle of the liquid level switch and the liquid level sensor is the same. Why is the wiring method of the liquid level switch different? It is because the liquid level switch is a controller that opens the valve of liquid inlet or outlet according to the signal output of the liquid level sensor to keep the liquid level constant. It can also be said that the output of the liquid level switch is a switch signal. The liquid level switch must first determine the height of the liquid level, and output the switch signal according to this height. The liquid level sensor converts the height of the liquid level into an electrical signal for output. We can process electrical signals such as connecting to a plc, data collector or dedicated display to output the height of the liquid level. Although the principle of the liquid level switch and the liquid level sensor is the same, the liquid level switch is a switch control circuit, and the liquid level sensor is a circuit element equivalent to a voltage change and a flow change.

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