The ultraviolet ray sterilizers of the WL series are built with body in AISI 304 stainless steel, equipped with a visual alarm system for lamp exhaustion / malfunction.
Installation diagram
Precautions
The sterilizers must be adequately protected with 5-10 microns microfiltration systems to avoid the passage of suspended material which can create shadow cones and dirty the lamp, reducing its transmittance. To ensure the effectiveness of the germicidal action of the lamps, be sure to replace the lamps every 8000 hours of operation.
Caution
To guarantee sterilization using the UV system, the water to be treated must meet the above requirements.
Characteristics of the water to be treated
In a liquid to be treated, maximum transparency is an important condition for correct transmission of UV rays. In particular, water contains suspended substances of various kinds that negatively affect the transmission of UV rays in the liquid, practically acting as a screen and reducing the intensity of the UV dosage in proportion to the thickness of the liquid (permeability index to UV rays) , therefore before installing a UV sterilizer it is necessary to take some samples of the water to be treated and on these carry out:
• Chemical / physical analysis, to establish the composition and ascertain any contamination from external agents and the possible presence of minerals, iron, manganese, acids, substances which, even in modest quantities, absorb the emission of UV making sterilization difficult .
• Microbiological analysis, to know the degree of bacterial or viral contamination.
In the presence of high microbiological contamination, it is necessary to carry out special pre-filtration of the water before treating it with the UV sterilizer.
Pre-filtration is also necessary to make the water to be treated transparent, if it is not, as turbid waters are less permeable to UV rays (eg rainwater), or in the presence of toxic chemical agents.
For convenience, here are some technical data not to be exceeded relating to the chemical / physical composition for the water to be treated:
• Salinity = Max 600 p.p.m
• Turbidity = less than 10mg / l
• Color = less than 20mg / l
• Manganese = max 0.05mg / l
• Iron = max 0.2mg / l
• Hardness = less than 10 ° F
• Color = transparent
• Hydrogen sulphide = less than 0.05mg / l
• Optimal temperature = 40 ° C.
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