What is a vibration switch?
A vibration switch is a device that recognizes the amplitude of the vibration to which it is exposed and provides some sort of response when this amplitude exceeds a predetermined threshold value. The switch response is typically an electrical contact closure or contact opening. The electrical contact may be either an electromechanical relay or solid-state device.
Why use a vibration switch?
Vibration switches are primarily used for protecting critical machinery from costly destructive failure by initiating an alarm or shutdown when excessive vibration of the machinery is detected. Conversely, a vibration switch can be utilized to warn when there is an absence of vibration, such as when a conveyor ceases to function due to a broken drive belt.
Vibration Switch is working according to the pendulum switching principle.
A swinging permanent magnet holds a magnetic switch situated below in a particular position. Due to vibration, the magnetic field between Reed Switch and magnet changes. Thus the switch is actuated resulting in the stoppage of the equipment. The responding sensitivity of the system can be changed by adjusting the gap between switch and magnet. Thus vibrations with amplitude below a set value can be suppressed. The free pendulum length and the responding frequency of the switch with a frequency slider can be adjusted exactly to the natural frequency of the equipment to be protected.
Applications include all types of rotating or reciprocating machinery such as cooling tower fans, pumps, compressors etc.