What are the signal output methods for gas detectors, and how should one choose?

 Common output methods include 4-20mA analog signals, RS485 digital signals (Modbus protocol), and wireless transmission (such as 4G). The 4-20mA signal is suitable for long-distance transmission with strong anti-interference capability and is often used to connect to PLC or DCS systems; RS485 supports multi-device networking, making it ideal for centralized monitoring; wireless transmission facilitates remote data viewing and mobile monitoring. Selection depends on on-site cabling conditions and system integration needs; for example, chemical plants may prioritize explosion-proof 4-20mA outputs.