3030226 Rev. D 5-10 Routine Maintenance
2. Draw a product water sample and use an independent meter to read the
conductivity (µS/cm) and temperature. Readings should be within ± 10% or ± 2
TDS/4 µS (whichever is greater). TDS readings are to be calculated using the
following equation: TDS = 0.5 x conductivity (µS/cm). Temperature should read
within ± 10%. If verifying conductivity, no conversion is necessary.
3. Draw a RO feed water sample and use an independent meter to read the
TDS/conductivity. Readings should be within ±10% or ± 2 TDS/4 µS (whichever is
greater). TDS readings are to be calculated using the following equation: TDS =
0.5 x conductivity (µS/cm). If verifying, conductivity no conversion is necessary.
Machine reading can be mixed with some recycle water depending on feed
water pressure. Feed water pressure should be above 35 PSI to make this
comparison.
WARNING:
Ensure that TDS/µS and membrane performance (% rejection) are normal for the
regions water quality. Consult your facility physician. An appropriate AAMI
analysis and bacteria/Endotoxin test meeting AAMI or CSA requirements of the
product water must be obtained and interpreted before using the RO unit for
hemodialysis treatment, refer to Section 2.3 “Product Water AAMI Analysis
Procedure” and Section 5.5.1 “Product Water Culture Procedure”.
5.2.3 Membrane Replacement
WARNING:
Only perform this procedure when the RO is OFF and disconnected from feed
water.
1. Remove the rear access door by removing the 4 screws that keep the door in
place.
2. Remove the membrane assembly by pulling the housing straight out from the
cabinet.
3. Remove the end caps from housing.
4. Remove the membrane from the housing. Discard membrane.
5. Install new membrane into housing. The membrane can be installed from either
direction. If only one end cap was removed, install the membrane with the
capped side of the permeate tube towards the bottom end cap.
6. Install the bottom end cap into the housing. The end cap is installed into the
membrane permeate tube that is capped.
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