3.3 自动操作旋钮开关转到“自动”位置，即由COD 分析仪直接控制预

Knobs 3.3 automatic operation turn the switch to "auto" position, which is directly controlled by the COD Analyzer preprocessor. Dang COD Analyzer entered
measurement stage, COD Analyzer Shang of following electric touch points closed, this following electric of touch points signal by left two core signal line introduced pretreatment
players, pre-processor receives to touch points closed signal Hou started pumps began sampling, while drainage valve first open must time Hou close, makes new
fresh of was measuring sample water full spill stream sampling Cup; COD Analyzer sampling ended Hou its internal control following electric touch points disconnect, pre-processor received
disconnect signal Hou close pumps,Simultaneously open the outlet valve to overflow sampling cups water vent, preprocessor after anti-blowing, washing,
finished went on standby, waiting for the next time you start signal.

3.3 Automatic operation
knob switch "Auto" position, i.e. the direct control of the analyzer COD preprocessor work. When COD analyzer into the
measurement phase, the relay contacts COD analyzer will close this relay contact signals from the left side of the line into two core signal preprocessing
later, pre-processor receives a contact closure signal to start the pump start samples, while the drain valve closed some time after the first opening, so that the new
fresh water samples tested sample cup filled with overflowing; COD analyzer sampling after its internal control relay contacts open, the preprocessor receives
disconnect signal Turn off the pump, open the drain valve while sampling cup of water in the overflow vent, after the pre-processor cleaning, washing,
after the completion into standby, waiting for the next start signal.

3.3 automatic operation
knob switch to "automatic" location, namely the COD analyzer to directly control the pre processor work. When the COD analyzer into
measure phase, relay contacts COD analyzer will be closed, the relay contact signal introduced by the two core signal line preprocessing
, pre processor receives contact closure signal to start the pump start sampling, at the same time the drain valve to open a certain time off, so that the new
fresh by sample overflow sampling cup filled with water; the internal control relay contacts disconnect after sampling COD analyzer, pre processor receives
disconnect signal after off pump,At the same time, open the drain valve of the water overflow sampling cup empty after the pre processor, anti blowing, flushing,
enter standby state is completed, wait for the next start signal.