AUTOMATIC ELECTRICAL CONTROLS FOR HOUSEHOLD AND SIMILAR USE. PART 2: PARTICULAR REQUIREMENTS FOR AUTOMATIC ELECTRICAL WATER LEVEL SENSING CONTROLS OF THE FLOAT OR ELECTRODE-SENSOR TYPE USED IN BOILER APPLICATIONS.
家用和类似用途的自动电气控制装置 第2部分:锅炉应用中浮子或电极传感器类型的自动电动水位传感控制器的特殊要求