100 Lexa PLUS| Instructions for Use |RIS-311 ENG Rev03 |29/08/2022 |© W&H Sterilization Srl
Technical data
Water quality
FEED WATER SPECIFICATIONS (ANSI/AAMI AND AAMI TIR34)
The table below lists the specifications for the water used for steam
sterilization according ANSI/AAMI ST55 and AAMI TIR34. Following is
the Table 1 AAMI TIR34.
Units
Utility water
1
flushing/ washing/
rinsing
Critical water
finale rinse
2
/steam
Hardness
mg/L < 150
3
< 1
Conductivity
µS/cm < 500 < 10
Total Dissolved
Solids
ppm < 350 < 6.5
pH
4
6 – 9 5 – 7
Chlorides
mg/L < 250 < 1
Bacteria
cfu/mL n/a, <10
5
< 10
Endotoxin
EU/mL n/a, <20
5
< 10
Note 1: This is the quality of water that might come from the tap but might
need some form of treatment to achieve these specifications.
Note 2: If this is the final rinse prior to sterilization of a critical device.
Note 3: If hardness is greater than 150 mg/L, a water softener is
recommended unless used for washing and the cleaning chemistry is
capable of handling higher levels of hardness.
Note 4: For boiler-treated steam, most boilers are treated to maintain a pH of
7.5 or 8.5. Any treatment of water that goes into boilers should be in
accordance with the sterilizer and boiler manufacturers' written IFU.
Note 5: After high-level disinfection.
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