Parameterization and operation – Hach-Lange RTC103 N-Module User Manual
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Parameterization and operation
INPUTS
CHANNEL 1
MIN INFLOW
Minimum flow rate of influent according to measurement signal 
corresponding to 0/4mA
[L/s]
MAX INFLOW
Maximum flow rate of influent according to measurement signal 
corresponding to 20mA
[L/s]
0/4 to 20 mA
Transfer range of 0/4 to 20 mA current loop as set in connected flow 
measuring instrument.
MIN RECIRCULATION
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Minimum recirculation flow rate according to measurement signal 
corresponding to 0/4mA
[L/s]
MAX RECIRCULATION
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Maximum recirculation flow rate of influent according to 
measurement signal corresponding to 20mA
[L/s]
0/4 to 20 mA
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Transfer range of 0/4 to 20 mA current loop as set in connected flow 
measuring instrument.
Note: The input is not connected to the 0/4 to 20 mA has to be 
calculated in ratio to Qinflow.
Q RECI RATIO
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
If the value Q RECI RATIO is “0” the RECI flow is calculated bases 
on the mA input signal. 
If the value is different from “0” the RECI flow is calculated from the 
inflow: 
Q RECI= Q RECI RATIO * INFLOW 
within the limits of MIN RECIRCULATION and MAX 
RECIRCULATION.
[%]
MIN RETURN SLUDGE
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Minimum return sludge flow rate according to measurement signal 
corresponding to 0/4mA
[L/s]
MAX RETURN SLUDGE
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Maximum return sludge flow rate of influent according to 
measurement signal corresponding to 20mA
[L/s]
0/4 to 20 mA
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
Transfer range of 0/4 to 20 mA current loop as set in connected flow 
measuring instrument.
4.5.2
2-Channel RTC103 N-Module Stages (Continued)
RTC MODULES / PROGNOSYS
RTC MODULES
RTC
