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graph LR

    %% 二氧化硫紫外荧光分析仪接口
    J3[辅助气接口]
    J1[样气接口]
    J2[排口接口]

    %% 样气测量气路
    Sample_IN[烟气样气] --> J1[样气接口]
    J1[样气接口] --> S1[二通常闭电磁阀]
    S1[二通常闭电磁阀] --> Tee1[三通接头1]
    Tee1[三通接头1] --> CF[Kicker碳氢涤除器]

     CF[Kicker碳氢涤除器] --> A1[反应室]
     A1[反应室] --> A2[集气室]
     A2[集气室] --> X1[红宝石气阻]
     X1[红宝石气阻] --(Back purge_IN)--> CF[Kicker碳氢涤除器]
  CF[Kicker碳氢涤除器] --(Back purge_OUT)--> DP[取样泵]

     %% 排气                                                                      
     DP[取样泵] --(Outlet)--> J2[排口接口]

     %% 辅助气（零气）
     Zero_IN[零气]-->J3[辅助气接口]
     J3[辅助气接口] --> F1[过滤器]
     F1[过滤器] --> S2[二通常闭电磁阀]
     S2[二通常闭电磁阀] --> Tee1[三通接头1]

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graph LR
    %% 样式全局定义
    classDef inlet_outlet fill:#f5f5f5,stroke:#333,stroke-width:2px;
    classDef valve_logic fill:#fff9c4,stroke:#fbc02d,stroke-width:2px;
    classDef analyzer_core fill:#e3f2fd,stroke:#1976d2,stroke-width:2px;
    classDef power_source fill:#f1f8e9,stroke:#689f38,stroke-width:2px;
    classDef gas_stream color:#546e7a,stroke-dasharray: 5 5;

    %% 1. 外部物理接口层
    subgraph Physical_Interfaces [外部连接接口]
        Inlet_Sample([样气采集口])
        Inlet_Zero([零气/校准口])
        Outlet_Exhaust([总排气口])
    end

    %% 2. 气路预处理与逻辑切换
    subgraph Gas_Selection [气路切换与过滤]
        Valve_Sample{样气切换电磁阀}
        Valve_Zero{零气切换电磁阀}
        Filter_Zero[零气精细过滤器]
        Tee_Join((气路汇合点))
    end

    %% 3. 核心检测单元
    subgraph Detection_Unit [核心检测单元]
        Kicker[Kicker 碳氢涤除器]
        Reaction_Chamber[紫外荧光反应室]
        Optical_Detector[光电探测检测室]
    end

    %% 4. 流量管理与动力系统
    subgraph Flow_Control [流控与动力系统]
        Capillary_Orifice[毛细限流孔/红宝石气阻]
        Vacuum_Pump{{大流量真空泵}}
    end

    %% --- 逻辑连线 ---

    %% 输入路径
    Inlet_Sample --> Valve_Sample
    Inlet_Zero --> Filter_Zero --> Valve_Zero
    
    Valve_Sample -- 测量模式 --> Tee_Join
    Valve_Zero -- 校准模式 --> Tee_Join

    %% 分析路径
    Tee_Join --> Kicker
    Kicker -- 样气管路 --> Reaction_Chamber
    Reaction_Chamber --> Optical_Detector

    %% 回流与排气路径
    Optical_Detector --> Capillary_Orifice
    Capillary_Orifice -- 反向吹扫干气 --> Kicker
    Kicker -- 渗透废气/吹扫气 --> Vacuum_Pump
    Vacuum_Pump --> Outlet_Exhaust

    %% --- 样式应用 ---
    class Inlet_Sample,Inlet_Zero,Outlet_Exhaust inlet_outlet;
    class Valve_Sample,Valve_Zero valve_logic;
    class Kicker,Reaction_Chamber,Optical_Detector analyzer_core;
    class Vacuum_Pump power_source;