Main detections and functions:
One). The work principle
  To same type of fresh water, within the scope of PH 5-9 conductivity and the content of the total dissolve solid become the linear relation mostly, according to determined range of cooling the water circularly, set the controlling range of conductivity .In process of cooling water circularly, conductivity attains to upper limit of set –range, the controller gives off the signal to start to open pump for getting rid of the dirty. When the liquid level of cooling tower is lower than lower limit ,the controller sends out the signal and start to open the pump of supplying water and regulate the amount of medicine. Use added water to dilution circulating water, makes the content of total permitted dissolve solid of circulating water and concentrated multiples to descend. When conductivity achieves the lower limit of set range ,the controller sends out the signals to close the pump; When the liquid level of cooling tower is higher than upper limit, the controller sends out the signal to close the pump of supplying water and regulate the amount of medicine. So, it can carry out getting rid of dirty ,supplying the water, adding the medicine automatically, which make the system of cooling the water circularly stability.
Two. The sketch map of the device of controlling to add the medicine automatically

Three. Main functions and index:
1. the measured and controlling range of conductivity :0 -2000/5000 μ S/ cms; the working temperature:60 ℃; realize getting rid of the dirty control automatically.
2. the range of The pH measurement: 0.0―14.0pH; the resolution factor: 0.01 pHs.( if collocate the sour bottle to the instrument, it can realize to add sour to regulate the pH value automatically)
3. the Measured range of the cooling tower water temperature: 0―100℃, accuracy 0.5%.
4. the Measured range of supplying the water current: 0.3―5m/s, carry out adding the medicine automatically 5. A control range of the liquid level of impounding reservoir:2%-10%, low electric potential and high electric potential have the alarm liquid lights independently indicator. realize supplying water automatically.
6.Have the calculator software support, record the measured value, compute concentrated multiple, statistics the amount of getting rid of the dirty, the amount of supplying water ,the amount of evaporating water and the amount of adding medicine.

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