05701-A-0302 是 System57 系列标准单通道气体监测卡件，专门配套催化燃烧式可燃气体传感器，完成气体信号采集、线性换算、浓度显示、多级报警输出与 4-20mA 模拟信号变送，是化工、油气防爆区域气体泄漏监测系统核心控制单元，机架式插拔安装，可搭配工程调试卡完成参数标定。

 05701-A-0302 is standard single-channel gas monitoring card of System57 series, matched with catalytic flammable gas sensors. It realizes gas signal sampling, linear conversion, concentration display, multi-stage alarm output and 4-20mA analog transmission. It is the core control unit for gas leakage monitoring in chemical and oil & gas hazardous area, rack pluggable design, parameter calibration supported via engineering card.

供电电源：24VDC 机架背板总线供电；检测量程：0~100% LEL；测量精度：±2% FSD；模拟输出负载：最大 600Ω；报警通道：2 路继电器 DO；硬件保护：传感器回路短路 / 开路保护、过压、浪涌 EMC 防护

 Power Supply: 24VDC backplane bus power; Measuring Range: 0~100% LEL; Accuracy: ±2% FSD; Analog Output Max Load: 600Ω; Alarm Channels: 2 relay DO; Hardware Protection: Sensor short/open circuit protection, overvoltage and surge EMC protection