Liquid level alarm device for closed cooling towers
Liquid level alarm device for closed cooling towers
Apr 24, 2025
The application scope of closed cooling towers is becoming more and more extensive, covering almost the entire industrial manufacturing field. Huatal Cooling shares with you the application of liquid level alarm devices, hoping to help you.
Liquid level alarm refers to the alarm of water level through mechanical or magnetic induction methods, which can be used to control the start or stop of equipment such as water pumps at the same time with sound and light alarms or magnetic alarms. When the water level does not reach the set water level line, the circuit of power supply 1 is in an open circuit state, the electromagnet has no magnetism, and the contact block is connected to the contact above it under the action of the spring force. Circuit 2 is in an open circuit, and the indicator light and buzzer have no response; when the water level rises and rises to the set water level line, the circuit of power supply 1 is connected, and there is current in the circuit. At this time, the electromagnet generates magnetism, sucks down the contact block, and connects the circuit composed of power supply 2 on the right, the red light is on, and the buzzer sounds, notifying that the water is full, and stopping the water discharge through the feedback circuit. There are two ways to realize automatic liquid level alarm:
Method 1 is to control it through an electronic water level switch (BZ1201 or BZ2401) and a matching water level controller (BZ101, BZ102). The principle of the electronic water level switch is to detect the water level through an electronic probe, and then the water level detection dedicated chip processes the detected signal. When the measured liquid reaches the action point, it outputs a high or low level signal, and then cooperates with the water level controller to output a relay switch signal, or directly power the alarm to realize the liquid level alarm function. The electronic water level switch does not require a float and a reed switch, has no external mechanical action, is resistant to dirt and durable, is not afraid of floating objects, can be installed at any angle, and has a certain anti-wave function when installed vertically. This method is more practical, resistant to dirt, has a long life, and is safe. It has two alarm modes: ultra-low water level alarm and ultra-high water level alarm.
Method 2 is to use a float switch for water level alarm. This kind of float ball is made of plastic or stainless steel. The float ball with an annular magnet inside attracts the reed switch with a reed switch inside the rod to send out a switch alarm signal by floating up and down the water level at any time. It is resistant to high temperature, acid and alkali corrosion, and is widely used in water treatment, water cooling, machinery and equipment, and electronics industries. Now it has developed into flange installation, thread connection, cable float valve, stainless steel current float ball, plastic float ball, KEY plastic cable float ball, proximity switch, door magnetic switch, reed relay, etc.
The future liquid level alarm device can achieve the following advantages:
1.Two series circuits are connected through electromagnetic relays to ensure power safety;
2. In addition to the indicator light, a buzzer is also added as an alarm in the circuit to make the alarm signal more obvious;
3. Automatic water level control is achieved through the feedback circuit.
The application of liquid level alarm devices in closed cooling towers mainly focuses on two aspects: one is the liquid level monitoring of the internal circulation water, and the stability of the internal circulation water volume is achieved by monitoring the high or low water level of the buffer water tank; the second is the liquid level warning in the spray tank, which can effectively prevent the spray pump from running empty.
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