WRO 300 H
16
Introduction
HCEN12481-02/2012
1.2.2
Conductivity monitoring
The conductivity monitoring system in the WRO 300 H has
three limits, allowing for individual adaptation of alarm settings
to local preferences and regulations. The three limits are
described in the sections below.
All three limits are set to 60 µS/cm from factory. With this set-
ting the WRO 300 H will stop without any previous warning if
the product water conductivity exceeds this value.
Conductivity notification
Indicates that the product water conductivity is above normal
reading. It will be issued when the WRO 300 H enters Standby
mode if the notification limit has been exceeded for more than
30 consecutive seconds during the previous run period. It may
be caused by several reasons such as incipient fouling, degrada-
tion of the RO membrane or change in the feed water quality.
Conductivity alarm
The clinic's predefined maximum product water conductivity
for water for dialysis has been exceeded for more than 30 con-
secutive seconds. An audible and visual alarm will be issued.
The WRO 300 H will, however, continue in operation to allow
for finishing the dialysis treatment. The buzzer can be muted
indefinitely by pressing
, however, the button remains lit to
indicate that the alarm persists.
NOTE
If the notification, alarm and stop limits are set to the same value the
priority of the action are in the order of stop, alarm and notification.
NOTE
If the feed water conductivity is known to vary significantly, the con-
ductivity notification limit should be inactivated by setting it at the
same value as the conductivity alarm, see below.