The pear switch lever detects liquids in a tank or container. It floats above the liquid level and acts like a mechanical switch when the liquid level goes up or down. They control devices such as pumps (pumping water in or out), valves (inlet and outlet inlet or outlet) or alarms to inform users. They are cost-effective and reliable and can be used with a variety of liquids.
How does a pear-shaped switch work?
In short, the pear switch lever is a mechanical switch that floats above the liquid level. When the liquid level goes up or down, it moves vertically with the liquid level. Depending on the balance and the preset “hook”, the mechanical switch opens or closes to connect electrical current to the device. Typically, this connected device either stops or starts the flow of liquid.
The pear switch lever consists of a hollow floating body and an internal switch, also called a sensor. The most common internal switch is a reed switch, so there is also a magnet inside the body. There are other types of internal switches, but their principle of operation is the same due to gravity and the water level that opens or closes the floating switch vertically up or down. Thus, the mechanical switch creates an open or closed electrical circuit.
For a reed switch, if the magnet is close to the reed switch, it creates a closed circuit (electric current can flow). Therefore, if the magnet moves away, the reed switch creates an open circuit (no electric current can flow). The switch has the maximum switching current and voltage, so make sure you do not exceed these specifications. The liquid level controls the angle of the float switch, which directly controls the position of the magnet inside it.
The installation of the vertical float switch has either a “fixed point” or an external equilibrium mode. This level is the preset position where the internal mechanical switch is placed between the open and closed. Figure 2 on the left shows a typical application for stopping water from entering a “high” point in a water tank.
Figure 2 on the right shows a similar application, but detects a “bottom” point in the water tank and works the other way around. Therefore, it is important to wire the wire properly and adjust the pre-set fluid level specifically for your application.
Float switches with external balance weights have angles in which they work. Therefore, the length of the cable from the weight to the float switch creates an angle with the water surface. These switches have a minimum and maximum cable length to ensure proper operation. Therefore, if they are used to start or stop the flow of liquid, they can be installed differently.
Wiring Pear Switch
Pear switch coil wiring is important for proper electrical signals based on the open or closed position of the switches. Below is a typical closed or normally open pear switch switch, but the “normal” function may be different for different brands and types of float switches. Please read your product guide on how to wire it in any of the configurations.
Floating switch depending on normal mode: The electrical circuit closes at the bottom and opens at the top. Therefore, by pulling the gravitational force downwards, it closes and opens as the liquid level rises to a predetermined level.
Floating switch normally open: The electrical circuit is open in the downward position and closed in the upward position. Therefore, by pulling the gravitational force downwards, it opens and closes as the liquid level rises to a predetermined level.
What is a float switch?
The float switch detects the level of liquids in the tank. Depending on the water level, an electrical circuit commonly used to pump water into the tank opens or closes.
How does a pear-shaped switch work?
The pear switch moves with the liquid level up and down. An internal mechanical switch opens or closes the electrical circuit by gravity. Therefore, the electrical circuit can turn equipment on or off like a water pump.
What does a pear-shaped switch do?
The pear swing switch controls the level of liquids in the tank. It then opens or closes the electrical circuit based on the liquid level and wiring to control external components.
How do you install a pear-shaped switch?
Pear switch switch is installed in the liquid tank. In the first stage, a predetermined level is created and can be done with a balance weight. Then, based on an open or closed wiring configuration, it opens or closes the circuit based on its up or down motion with the liquid surface.
How to wire a pear switch switch?
A pear-shaped switch is normally opened or closed. When it is low it is normally open (liquid level is low) and when it is low it is completely closed. Open / closed position refers to the electrical circuit.
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