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MSL600
Installation, Operation & Maintenance Manual
IP262/Z0, Rev. AB
February 2012
7.9.2.2 Noise Alrm Lev – P622
The unit automatically monitors the background electronic noise floor as a % of display width, see parameter
D834. If this level exceeds the Noise Alarm Lev value, programmed as a % of display width then an alarm can
be indicated by allocating an output in P552, Noise Alarm.
The default value is 25%.
Parameter values:
Default Min Max
25 0 100
7.9.2.3 Top Blanking – P623
This is the minimum operating range for the transducer in metres (feet – imperial). This parameter allows the
user to program a region in front of the transducer which is not used by the system.
This is useful if there are any fixed obstructions in front of the transducer which cannot be moved or otherwise
avoided.
This parameter is also useful when programming the industrial algorithm for avoiding floating or settling debris in
front of the transducer.
The default value is 0.3 metres / 1 foot.
Parameter values (metric) Parameter values (imperial)
Default Min Max Default Min Max
0.300 0.100 7.000 1.00 0.33 23.00
7.9.2.4 Damping – P624
It is unlikely that the blanket level will change by a large amount on a short time scale. The settling process is
typically fairly slow. If the system should want to respond to noise or stray echoes from bubbles or debris this
parameter, which is programmed as a time measured in seconds damps out rapid fluctuations in the measured
sludge blanket level.
The default value is 60 seconds.
Parameter values:
Default Min Max
60 0 9999
7.9.2.5 Upr S-nat Temp – P625
This is the value used for temperature compensation if the measured supernatant temperature should exceed
this value. Valid entries are between –35 and +85°C (-30 to 185 deg F).
The default is +40°C (105 deg F)
Parameter values (metric) Parameter values (imperial)
Default Min Max Default Min Max
40 -35 +85 105 -30 185