Hach-Lange RTC113 ST-Module - Manual (Page 30)

30
Parameterization and operation
4.7.10 DERIVATIVE TIME TSS
Derivative time for the PID closed-loop controller for the TSS
concentration in the thickened sludge.
4.8 INPUT/OUTPUT LIMITS
4.8.1 FEED FLOW LOW
Feed flow rate input signals below this value [m 3 /h] are set to this
value. This means that very low feed flow rates can be avoided.
4.8.2 FEED FLOW HIGH
Feed flow rate input signals above this value [m 3 /h] are set to this
value. This avoids load peaks.
4.8.3 FEED FLOW SMOOTHING
Feed flow measurement values are smoothed in line with this
parameter.
SMOOTHING = 1: The signal for the flow rate measurement
is not smoothed.
SMOOTHING = 2: Smoothing is performed over 3 minutes.
SMOOTHING = 3: Smoothing is performed over 5 minutes.
SMOOTHING = 5: Smoothing is performed over 12 minutes.
SMOOTHING = 10: Smoothing is performed over
25 minutes.
Example:
With the setting SMOOTHING = 2, it takes 3 minutes for the
smoothed value to reach 95 % of the final value after an abrupt
change in the feed flow rate.
4.8.4 LIMIT TSS IN LOW
TSS measurement values from the influent that are below this
value [g/L] are set to this value (to avoid low peaks).
4.8.5 LIMIT MAX TSS IN HIGH
Measurement values from the influent that are above this value
[g/L] are set to this value (to avoid high peaks).
4.8.6 TSS IN SMOOTHING
TSS measurement values from the influent are smoothed in line
with this parameter.
SMOOTHING = 1: The signal is not smoothed.
SMOOTHING = 2: Smoothing is performed over 3 minutes.
SMOOTHING = 3: Smoothing is performed over 5 minutes.
SMOOTHING = 5: Smoothing is performed over 12 minutes.
SMOOTHING = 10: Smoothing is performed over
25 minutes.