how to connect 2wire smoke detector connection in hindi / urdu

In the video we are learning how to connect smoke detector or connection in language hindi / urdu.
SMOKE DETECTOR
Optical smoke detector is designed for detection of a visible smoke at a start of a fire's flame less stage when material starts to smoulder and therefore generally, a long time prior to the appearance of an open flame and a noticeable rise in temperature.

The smoke detectors use ionization and photoelectric technologies whereas a heat detector uses thermocouple and electro-pneumatic technologies. While the smoke detectors are very sensitive and are prone to give off false alarms. The heat detectors are more reliable fire detectors, even in dusty environments.
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