StarLab GuardOne, User Manual

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Bacterial destruction through UV irradation
UV light helps removing (or reducing the number of) airborne microorganisms from a closed environment. It is proven that UV light destroys
almost all DNA-based microorganism given a sufficient UV dosage and irradiation time. But many variables like airflow, humidity, distance
of microorganisms to UV light or UV dosage are present in a real-world environment that make actual calculation of the irradiation time very
difficult. Before performing the steps to adjust the UV 254 Decon, refer to the calculation example for the minimum irradation time, including
the formula as well as the table of recommended times for decontaminating minimum from common organisms.
The germicidal destruction rate is calculated as follows:
Microwatt seconds/cm² = microwatts/cm² x seconds of exposure
The bacterial destruction chart below indicates the amount of shortwave (254 nm) UV energy required for complete destruction of various
organisms.
Please note that optimal working conditions are required for the recommended duration of irradiation.
Changing only one factor results in a changed required irradiation time.
Bacteria Required Microwatt (µW) seconds/cm²
Recommended minimum exposure time
in minutes in 1 m distance by a UV-C
power of 48 μW/cm²
Bacillus anthracis 8700 3
Bacillus megatherium sp. (veg.) 2500 1
Bacillus megatherium sp. (spores) 5200 2
Bacillus parathyphosus 6100 2
Bacillus subtilis (veg.) 11000 4
Bacillus subtilis (spores) 22000 8
Clostridium tetani 22000 8
Corynebacterium diphtheriae 6500 2
Eberthella typhosa 4100 1
Escherichia coli 6600 2
Micrococcus candidus 12300 4
Micrococcus sphaeroides 15400 5
Mycobacterium tuberculosis 1000 0
Neisseria catarrhalis 8500 3
Phytomonas tumefaciens 8500 3
Proteus vulgaris 6600 2
Pseudomonas aeruginosa 10500 4
Pseudomonas fluorescens 6600 2
Salmonella enteritidis 7600 3
Salmonella sp. 10000 3
Salmonella typhimurium 15200 5
Sarcina lutea 26400 9
Serratia marcescens 6160 2
Shigella paradysenteriae 3200 1
Spirillum rubrum 6160 2
Staphylococcus albus 5720 2
Staphylococcus aureus 6600 2
Streptococcus hemolyticus 5500 2
Streptococcus lactis 8800 3
Streptococcus viridans 3800 1