Water Quality - W&H Lexa MN-111 Instructions For Use Manual

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
Hardness mg/L
Conductivity µS/cm
Total Dissolved ppm
Solids
4
pH
Chlorides mg/L
Bacteria cfu/mL
EU/mL
Endotoxin
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
Lexa | Instructions for Use | MN-111 ENG Rev14 | 03/04/2023 | © 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
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.
Notice:
The use of water with a conductivity greater than 10μS/cm (6.5
ppm) may affect the sterilization process and damage the sterilizer.
2
The use of water with a conductivity greater than 50μS/cm, or not
complying with the specifications in the table above, may strongly
affect the sterilization process and seriously damage the sterilizer.
< 1
The manufacturer's warranty is void if the sterilizer was used with
water containing contaminant or chemical levels exceeding those
listed in the table above.
< 1
Technical data
95