Plastic reed switch is the abbreviation of dry reed switch. It is composed of a pair of elastic tongue reeds made of magnetic materials. The tongue reeds are sealed in a glass tube filled with inert gas. The tongue reed end faces are mutually connected. Stack but leave a small gap. The reed end contacts are plated with a precious metal such as rhodium or ruthenium, which gives the switch stable characteristics and an extremely long service life. When the magnetic field generated by a permanent magnet or coil is applied to the switch, the two reeds of the plastic reed switch are magnetized, causing one reed to generate an N pole at the contact position and the other reed to generate an S pole at the contact position. pole. If the generated magnetic field attraction overcomes the resistance caused by the elasticity of the reed, the reed will be in contact and conductive due to the attractive force, that is, the circuit is closed. Once the magnetic field force is eliminated, the tongue reeds are separated again due to the elastic force, that is, the circuit is disconnected.

Characteristics of plastic reed switches:

1. The advantages of plastic reed switches compared with ordinary reed switches are:

a. The outer plastic can play a protective role.

b. The glass tube will not break when the plastic reed switch is bent during use.

2. The dry reed tube has a compact structure and small weight, and can be installed in an extremely limited space, making it very suitable for use in miniaturized equipment.

3. The switching components of the dry reed switch are hermetically sealed in an inert gas atmosphere and will never come into contact with the external environment. They have a long working life.

4. Dry-type reed tubes do not use sliding elements, so there will be no metal fatigue phenomena related to the degradation of all metals, ensuring virtually unlimited mechanical service life.

5. Magnetic reed switches are used in mobile phones, program-controlled switches, copy machines, washing machines, refrigerators, cameras, disinfection cupboards, door magnets, window magnets, electromagnetic relays

Electronics Weighing instruments, liquid level gauges, gas meters, water meters, etc. are all well used.

Precautions for using reed switches:

1. Cut or bend reed switches Extreme care must be taken when connecting the lead pins to avoid applying undue stress and damaging the glass-to-metal seal. Proper clamping tools must be used.

2. Temperature and long exposure time may cause damage to the glass-metal seal (cracking, leakage, etc.), so fast and reliable welding must be used Technology (Process). The recommended welding conditions are: 280 to 300°C for hand soldering and 250 to 300°C for wave soldering.