The liquid level sensor is a common sensor to measure the position of the liquid level, which converts the height of the level into an electrical signal for output. The liquid level sensor is a module circuit, which has the advantages of acid resistance, moisture resistance, shock resistance, corrosion resistance, etc., and contains a constant current reaction circuit and an internal maintenance circuit inside the circuit, which can make the maximum output current not exceed 28mA, so that the power supply can be reliably maintained and the secondary instrument will not be damaged.
THE GENERAL OUTPUT SIGNAL OF THE LIQUID LEVEL SENSOR IS CURRENT 4-20MA, 0-20MA, OR VOLTAGE 0-5V, 1-5V, 0-10V, ETC., AND THE CURRENT TYPE IS USUALLY TWO-WIRE OR FOUR-WIRE SYSTEM, VOLTAGE THREE-WIRE OUTPUT. At present, many of them do not have 24VDC power supply, most of them are 10V, and some transmitters with large power consumption, 10VDC power supply can not be driven, so only external power supply 24VDC. In this way, there are four terminal blocks for the level sensor: power +, power supply-, reaction+ and reaction-.
The current type two-wire connection ratio of the liquid level sensor wiring: power +== power supply +; Signal +== reaction +, power supply -== reaction -, if not far transmission, only need to connect 24V voltage +,-, if the demand for remote transmission needs to form a loop, such as 24V + connected to the pressure gauge +, pressure gauge - connected to 4 - 20mA +, 4 - 20mA - connected to 24V - can be, maybe there is a terminal in the center, to see the circuit diagram.
Voltage type three-wire wiring method of liquid level sensor wiring: power +== power supply +; Power - (Signal -) = = Power Supply - ; Signal +== Reaction +, Power - (Signal -).
Four-wire wiring method of liquid level sensor wiring: power +== power supply +; Power -== Power Supply -; Signal +== reaction +, signal -== reaction-.
Why is the principle of the level switch and the level sensor the same, and why is the wiring method of the level switch different? This is because the level switch is a controller that outputs a valve that opens up water or enters the water according to the signal of the level sensor, so that the water level is stable. It can also be said that the liquid level switch outputs a kind of switching signal, and the liquid level switch must first confirm the height of the liquid level, and output the switching 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 them to PLCs, data collectors or professional displays, to output the height of the liquid level. There is also the fact that the principle of the level switch and the level sensor is the same. However, the liquid level switch is a switching control circuit, and the liquid level sensor is a circuit element equivalent to the voltage conversion and current transformation.
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