Installation and operating manual for WATERFRIEND exclusive MRD-2 Page 39 (44)
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Explanations
Storage, Transport
During transport and storage it is important to note that the single-rod measuring chains are frost resistant down
to minus 10 ° C. For lower temperatures, we have special single-rod measuring chains in the delivery program.
Maintenance
Service work may only carried out on de-pressurised, voltage-free equipment which has been protected against
unauthorised switching on.
The metering unit should be serviced by specialist personnel at regular intervals.
6-monthly service
Sealtightness
Check all connections for sealtightness at regular intervals.
Dirt filter
The filter screen should be checked for soiling and accumulations at regular intervals. The filter screen must be
cleaned or replaced if necessary.
Injection valves
The injection valves should be checked for soiling and accumulations at regular intervals. They should be cleaned
if necessary.
pH electrode
The electrode function is checked at regular intervals using the two buffer solutions (pH7 and pH4). If there are
any noticeable variations, the electrode should be calibrated or replaced (see above in manual, "Calibrating pH
electrode").
ORP electrode
The electrode function is checked at regular intervals using buffer solution 468mV. If there are any noticeable
variations, the electrode should be calibrated or replaced (see above in manual, "Calibrating ORP electrode").
