WDT Operating instructions GRANUDOS 10 (V61-08/05) page 7 of 20
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1.5.2 Monitoring of external controller and dosing with programme E15/E60
When controlling the GRANUDOS dosing by an external controller the dosing performance must be set
high enough to ensure the dosing time of acid and chlorine dosing motors shall not exceed 50% of total
time, the actual values are normally near to the set points of free chlorine and pH. If control time
exceeds 50% , there must be an interruption in the system:
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too high bathing load
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interruption at the dosing appliance: blocked screw, broken hose, faulty motor etc.
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interruption at the auto control system: hanging relay, faulty electrode etc.
The GRANUDOS controller adds up all ordered dosing time (input time) that exceeds
50% of total time and stops dosing if a certain excess time is reached: 15 minutes with
programme E15, 60 minutes with programme E60. Indication by flashing of all 4 red lamps.
Dosing can be switched off by an additional external switch e.g. a flow por pressure switch
in the measuring water tubing or in the circulation to prevent dosing if there is an
irritation
