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The first smoke detectors are based on optical principles - photoelectric detectors.
CO2 detectors are used for detecting levels of carbon monoxide in the air. Many people use CO2 detectors in their homes to prevent carbon monoxide poisoning.
Laser detectors detect laser beams used by law enforcement to measure speed, while radar detectors detect radio waves used by police radar guns. Laser detectors are more precise but have a shorter range compared to radar detectors. It's recommended to have both types of detectors for comprehensive coverage.
A: Inrusion detectors
The element used in smoke detectors and named after the US is Americium (Am). It is a radioactive element commonly found in household smoke detectors to detect smoke particles in the air.
Infrared detectors are commonly used to detect wavelengths in the infrared range of the electromagnetic spectrum. They can be made using various technologies, such as thermopiles, pyroelectric detectors, and semiconductor-based detectors like InSb or HgCdTe detectors. These detectors convert infrared radiation into an electrical signal that can be analyzed or used for various applications.
14-3 Is the standard wire use for residental smoke detectors.
Smoke detectors are devices that detect smoke. They are used as warning devices in houses to warn people of fire.
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Nickel detectors
There are several types of leak detectors used in HVAC systems, including electronic leak detectors, ultrasonic leak detectors, and dye-based leak detectors. Electronic detectors sense refrigerant gases through sensors, while ultrasonic detectors pick up sound waves generated by leaks. Dye-based detectors involve adding a fluorescent dye to the refrigerant, which can be visually inspected under UV light. Each type has its advantages, depending on the specific needs of the HVAC system and the type of refrigerant used.