83262815

Snap Action, Limit Switches - 83262815 application field and working principle

Snap action limit switches are a type of mechanical switch that is activated when certain conditions are met. They typically use a plunger-type mechanism to provide a rapid, precise, and reliable means of setting a precise limit for a device or system. The snap action limit switches are designed to provide precise and reliable control measurement for various applications. The snap switch operates by sensing when an external force causes a contact to move from one position to another. When the contact triggers, a "snap-action" occurs, switching from an open-circuit state to a closed-circuit state in an instant.

Applications

Snap action limit switches are widely used to open and close circuits in industrial, automotive, and other applications. They are often used to identify when the device has been turned on or off and are especially useful in situations where precise levels need to be monitored. Some examples of applications in different areas include:

• Automotive: Engine temperature monitoring, door latch alerts, temperature switch.
• Industrial: Level monitoring, fuel gauges, motors, and other industrial equipment.
• Medical: Intravenous systems, pulse oximeters, and surgical instrumentation.
• Consumer electronics: Washing machines, fridges, and other household appliances.

Working Principle

The working principle of snap action limit switches is the same for all types: the plunger-type mechanism is spring-loaded, and when a force is applied, it snaps from one position to another. In most cases, the snap action limit switch is being used to monitor a specific position or level. For example, when a motor has reached its specified running rpm or when a fuel tank has reached its minimum or maximum level. When the plunger moves from its resting spot, it or another component completes an electrical circuit, which then transmits a signal that something has been changed.

In terms of action, snap action limit switches are activated by an external force, such as the pressure exerted by a spring, or an actuator. When the limit switch is activated, the plunger is released and the contacts close, resulting in a closed-circuit signal. When the external force is removed, the spring or actuator retracts and the plunger is no longer held in the triggered position, thus opening the circuit.

Advantages

There are three main advantages to using snap action limit switches. First, they are reliable, precise, and fast. They provide an accurate signal when the set limit is reached and can switch states very quickly. Second, they are easy to install, maintain, and operate. As they have a proven design and mechanism, they are simple to use and require minimal maintenance. Lastly, snap action limit switches are cost-effective and reliable. They have a long lifespan, making them a great cost-saving option.

Disadvantages

Snap action limit switches do have some drawbacks, such as sensitivity to dirt and dust. If there is dust or dirt in the environment, the switch may not be able to accurately measure the conditions. In addition, if the contact points become worn, the switch may become less accurate or even fail altogether. They also require periodic adjustment which can be time consuming.

Conclusion

Snap action limit switches are an extremely useful type of mechanical switch that can be used in a variety of industrial, automotive, and other applications. They are reliable, precise, and easy to use and maintain, making them a great long-term cost-saving device. However, they are also sensitive to dirt and dust, and require periodic adjustment, as well as extra care when selecting the right switch.