Water Quality - W&H Lexa PLUS Instructions For Use Manual

Technical data

Water quality

100
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
mg/L
Hardness
µS/cm
Conductivity
ppm
Total Dissolved
Solids
4
pH
mg/L
Chlorides
Bacteria cfu/mL
Endotoxin EU/mL
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.
Lexa PLUS | Instructions for Use | RIS-311 ENG Rev03 | 29/08/2022 | © W&H Sterilization Srl
1
Utility water
Critical water
finale rinse
flushing/ washing/
/steam
rinsing
3
< 150
< 500 < 10
< 350 < 6.5
6 – 9 5 – 7
< 250
5
n/a, <10 < 10
5
n/a, <20 < 10
2
< 1
< 1