2.2.6 Switches
1.Reed Switch
The reed switch is a type of mechanical-contact switch. Two or more metal reeds are enclosed in a hermetically sealed glass capsule. A normally open (NO) reed switch is shown in Figure 2-28. The overlapping reeds can be closed or opened by positioning a permanent magnet near to or away from the reed contacts.
2.Inclination Switch a pre
The inclination switch is used as a precise sensor in security device. The configuration is shown in Figure 2-29. The contacts are normally open and can be closed when the angle of tilt is between 20 and 30 degrees.
3.Limit Switch
Limit switches are widely used in industrial control and consumer electronic products.Figure 2-30 shows a basic limits switch. It has advantages such as the high precision, excellent sensing characteristic, and high reliability due to the small contact space and snap-action mechanism designs.