if the system is not equipped with error-proof O2 or CO monitoring ,it must be ensured with any existing O2 correction that with the maximum correction applied the combustion engineering limits are adhered to 第一个with是与equipped 搭配使用 意为装备 that应该与it must be ensured .that +句子 it 引导主语从句
第二个的with any existing O2 correction 为状语 类似于 with the development of technology
至于第三个with 我不是很清楚 个人认为就是普通的介词短语 你可以再看看其他资料 或者把完整句子发给我试试 希望能对你有用