Rational SCC CM, Руководство по обучению

Страница: 24 / 40

V03 EN, Fundamentals - 24 -
General information about water
The conductivity of the connected water should be above 50μS/cm (micro Siemens).
The measured total hardness (TH) is normally higher than the measured amount of calcium or
magnesium carbonat (CaCO3, MgCO3).
Should the total hardness be smaller than the Carbonat hardness, most likely a water treatment plant is
connected.
Common terms:
General hardness
GH is the measure of carbonat (KH) and non-carbonat
hardness (NKH) in the water
Carbonate hardness KH is the measure of bicarbonate (HCO3-) and carbonate
(CO3--) ions in the water;
Temporary water hardness; Forms sediments when
boiled;
Non-carbonat hardness NKH Calcium and Magnesum ions in the water;
permanent water hardness which can not be removed by
boiling
German Hardness dH 1°dH = 10mg CaO / l e.g. 17,8 ppm CaCO3 (USA)
Chlor Cl Gaseous, (used in swimming pools), limit 0,2mg/l
Chloride Cl - - chemical bond of chlorid e.g. NaCl, limit 80mg/l
Waster Analysis
Which values are needed?
- General hardness GH
- Carbonate hardness KH
- Conductivity in micro Siemens/cm
- Ideal: Water analysis with chlorid content value
Possible reasons for corrosion
- Excessive usage
- ferritic accessories
- rusting water pipes
- Cleaning procedure (Unit is not dry over night)
- water