SKA/NE-502 series gas alarm adopts high performance intelligent gas sensor with high sensitivity and accuracy. It is a high performance instrument for continuous on-line gas monitoring. The SKA/NE-502 series gas alarms feature a modular design and an integral flameproof (d) structure for fixed installation. The standard configuration is with dot matrix LCD LCD display, 3-wire system 4~20A analog and RS485 digital signal output, optional configuration is programmable switching output module, according to user needs to provide customized products, but also support output signal fine-tuning and other functions, convenient system networking and maintenance. The alarm can realize real-time concentration display on the computer through the gas alarm controller and monitoring management software, and can also transmit real-time monitoring data and alarm status to the security control center through the optional wireless module. Widely used in petroleum, chemical industry, fire, gas, ships, environmental monitoring, municipal, energy and power, metallurgical casting, wood processing, grain storage, tobacco fumigation industry spraying, sewage treatment, scientific research experiments, emergency rescue monitoring and other fields.