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一台ＨＧ—3型火焰光度计,准备工作完成后,先启动气泵开关,接着启动点火开关,点火指示灯不闪烁,无打火现象,火焰点不着(见图1)。该机的点火装置电路如图所示。正常工作时,启动气泵开关,交流继电器Ｊ3的线圈带点,其常开接点Ｊ3-3闭合。此时,启动点火开关ＡＮ1,则220Ｖ交流电压通
After an HG-3 flame photometer is ready for completion, the air pump switch is turned on first, and then the ignition switch is started. The ignition light does not flicker and there is no ignition, and the flame cannot be seen (see Figure 1). The ignition circuit of the aircraft is shown in the figure. During normal operation, the air pump switch is activated and the coil of the AC relay J3 is tapped, and its normally open contact J3-3 is closed. At this point, start the ignition switch AN1, then 220V AC voltage through