PESD1CAN liquid level relay is an electrical device used to detect and control the liquid level. It usually consists of liquid level sensor and relay. The liquid level sensor is used to detect the change of liquid height or pressure and convert the signal into electrical signal. The relay controls the switch state of the circuit according to the signal of the liquid level sensor.
There are two main wiring methods of liquid level relay: floating ball wiring method and electrode wiring method.
1. Floating ball wiring method:
Float type liquid level relay usually consists of a float and a magnetic switch. When the liquid level rises, the floating ball also rises. When the floating ball rises to a certain height, the magnetic switch will be closed and energized; When the liquid level drops, the floating ball also drops. When the floating ball drops to a certain height, the magnetic switch will be disconnected and power off.
The wiring method is as follows:
a. Connect the input end of the float level relay with the positive pole of the power supply, and connect the output end with the positive pole of the load (such as the motor or alarm).
b. Connect the negative pole of the power supply with the negative pole of the load to form a circuit loop.
2. Electrode wiring method:
Electrode type liquid level relay usually consists of two electrodes and one relay. One electrode is installed at the bottom of the liquid, and the other electrode is installed at the top of the liquid. When the liquid level is lower than the lower electrode, the relay is disconnected; When the liquid level is higher than the upper electrode, the relay is closed.
The wiring method is as follows:
a. Connect the input end of the electrode type liquid level relay with the positive pole of the power supply, and connect the output end with the positive pole of the load (such as the motor or alarm).
b. Connect the input end of the electrode type liquid level relay with the negative pole of the load to form a circuit loop.
The working principle of liquid level relay is as follows:
1. Float level relay:
When the liquid level rises, the floating ball also rises, making the magnetic switch closed. The current passes through the coil of the relay, and the coil generates a magnetic field, making the contact of the relay closed and the load energized. When the liquid level drops, the floating ball also drops, making the magnetic switch disconnected, the current no longer flows through the coil of the relay, and the magnetic field of the coil disappears, making the contact of the relay disconnected and the load cut off.
2. Electrode type liquid level relay:
When the liquid level is lower than the lower electrode, the contact of the relay will be disconnected and the load will be cut off. When the liquid level is higher than the upper electrode, the contact of the relay is closed and the load is energized.
The working principle of the liquid level relay mainly depends on the signal of the liquid level sensor to control the contact state of the relay, thus realizing the detection and control of the liquid level. The liquid level sensor usually adopts the way of floating ball or electrode. When the liquid level rises or falls, the sensor will generate corresponding signals, convert the signals into electrical signals through relays, and control the switching state of the load.
Liquid level relay is widely used for liquid level control of various liquid containers, such as pool, oil tank, chemical tank, etc. It can be used to monitor the liquid level and control the opening or closing of the corresponding equipment or alarm when the liquid level reaches the preset value, so as to realize the automatic control and protection of the liquid level.
