WDT Operating instructions GRANUDOS 10 (V61-08/05) page 6 of 20
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1.4 Acid Dosing
The acid required either for pH-control or just for cleaning of the
flushing, mixing and dosing system is metered by the peristaltic pump
to the flushing water via the dosing injector (11). As the cleaning
procedure is vital for the correct function of the complete dosing
assembly, chlorine dosing is stopped if the level switch at the supply
carboy lance indicates container empty.
Please do not use concentrated hydrochloric acid for this duty as that
penetrates the peristaltic hose and will destroy the pump head.
1.5 Control Panel
The microprocessor based control of the GRANUDOS has three functions:
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Contains the circuit self check and dosing programmes for chlorine and acid
-
Function control and interruption display (1 green + 4 red LED). If any
interruption is displayed, the GRANUDOS is switched off - 'Chemicals on
reserve' is only indicated. All faults normally activate the fault remote
control.
The control system is enclosed within a dust
proof and splash proof housing (IP 65). External
switches and fault remote indication are to be
connected in the lower part of the housing.
1.5.1 Programme Selection (GRD 61)
P:
Proofing programme for control board, only
used by authorised personnel
For test and check of dosing motors:
C5:
Continuous dosing of chlorine for 5 minutes
A5:
Continuous dosing of acid for 5 minutes
After the 5 minutes dosing the green LED will flash
continuously
ECA: External control of chlorine and acid by an
auto controller
EC:
Auto control only chlorine, acid dosing
continuously as set, but only if chlorine is
dosed
E15:
Monitoring of the external auto controller
chlorine and acid: After an excess time of 15
minutes dosing stops.(see next para)
E60:
Monitoring of the external auto controller
chlorine and acid: After an excess time of 60
minutes dosing stops.(see next para)
When changing a programme there is always a delay of 4 seconds until the new programme
is verified. During this time the green lamp will flash.
