Cooling towers are mainly used for cooling of large air compressors. At present, domestic cooling towers are generally packed towers. If the liquid level in the tower is too high, it is easy to cause: (1) The dehydration effect of the cooling tower is not good; (2) The system pressure fluctuates (3) The porcelain ring in the tower is easy to be crushed; (4) The workload of each water outlet is increased. The cooling tower liquid level control system is mainly used to control the liquid level of the cooling water in the cooling tower to maintain a reasonable range at any time, and can realize the real-time monitoring and abnormal alarm functions of the liquid level to ensure that the high temperature of the air compressor will not be caused. malfunction or damage.

Liquid level sensor (hydrostatic level gauge/liquid level transmitter/liquid level sensor/water level sensor) is a pressure sensor that measures liquid level. The static pressure input liquid level transmitter (liquid level gauge) is based on the principle that the static pressure of the measured liquid is proportional to the height of the liquid. The voltage is converted into an electrical signal, and then after temperature compensation and linear correction, it is converted into a standard electrical signal (usually 4~20mA/1~5VDC).

The coolant level sensor is used to monitor the coolant level of the cooling system and transmit the information to the ECM through the engine wiring harness. If the coolant level drops below a certain level, the ECM will make an alarm, and the engine power will gradually decrease to protect the engine. The coolant level sensor is installed on the radiator tank or in the expansion tank.
 
Voltage is detected simultaneously on the No. 27 high liquid level signal terminal and J/No. low liquid level signal terminal of the coolant level sensor of the engine wiring harness, or no voltage is detected on each terminal. The ECM considers it to be a fault and stores it with fault code 422, at which time the yellow indicator light is on. The engine will lose the coolant level protection.

It can be seen that liquid level control is one of the common industrial process controls. It is widely used in liquid level measurement of pressure vessels such as water towers, boilers, high-rise building water tanks, tanks, and industrial chemical tanks. With the advancement of science and technology, people have higher and higher requirements for the control accuracy of production, so it is very important to improve the performance of the liquid level control system. For this reason, the company provides the corresponding solution of liquid level sensor - LM for cooling tower liquid level monitoring. The LM level sensor uses a patented stainless steel housing sensor combined with a plastic process connection to measure the level of water and other liquids. The product design is flexible and can meet the various requirements of customers for process connectors. The LM liquid level sensor has a compact structure and high precision. The working voltage is 5V and the standard output is 0.5V ~ 4.5V. LM level sensors are used in irrigation systems, RV and ship water level maintenance, water storage and water circulation systems, small tank level, coolers and vapor condensing equipment, etc.

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