Introduction to the automatic alarm device for grid disconnection

Spot Remarks 2017+

Probe domestic switch needle KG300B head diameter 3.0 normally closed switch needle total length is 5

Murata muRata winding inductance original authentic assured purchase

The circuit operation of the device is shown in Figure 13. When the wire mesh Fe is intact, the LSE's 1 and 2 legs are colluded, the 4th pin outputs a high level, the triode VT is turned off, the relay J is in the released state, and the alarm does not work. If the wire mesh Fe is cut (any segment), at this time, the LSE 1 and 2 feet are equivalent to an open circuit, and its 4 feet are changed from the original high level state to the low level state, and the triode VT is turned on, thereby making the relay J excitation pull, its normally open contact j is closed, the power of the alarm circuit is turned on, and an alarm sounds.

Brief introduction of the alarm

1, type

There are many types of alarms. According to the different physical quantities detected, they can be divided into: microwave, infrared, laser, ultrasonic and vibration. According to the different transmission modes of electric signals, they can be divided into two modes: wireless transmission and wired transmission. .

2, the working principle

A dedicated electronic alarm system generally consists of a detector, a transmission system and an alarm controller. The detector can generate an alarm signal when an unexpected condition is detected, and an acoustic, optical or other alarm signal is transmitted to the alarm controller through the transmission system.