General description This AC 220V Standalone Coal Gas Leak Detector is designed to detect natural gas and coal gas leaks effectively. It features a relay output with NC and NO options, making it suitable for various applications. The detector should be installed within 2.5 meters of the gas source for optimal performance. Technical specifications Power Supply: AC 220V Gas Density Detection: 6% LEL Indicator Lights: Red and Green LED indicators Alarm Output: Relay NC and NO Installation Mount the detector near the gas source within 2.5 meters. Ensure proper connection of power supply and signal cables. Avoid installation outdoors or in humid locations. Do not place near high air circulation areas such as ventilation systems or doors. Ensure the detector is not isolated from the gas source. Usage Upon powering on, the device goes through a warm-up state indicated by a flashing red LED and a sound from the speaker. In normal operation, the green LED flashes once per minute for about 3