Hach-Lange RTC103 N-Module - Manual (Page 13)

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General Information
Figure 3 Principle operation mode of RTC103 N-Module
Basic RTC103 N-Module
For each lane the calculated DO set point is delivered either by analog output or via the
sc1000 ProfiBus communication card to the PLC. The DO control algorithm has to be
implemented on the PLC.
Option 2: RTC103 N-Module with DO aeration stages controller
The RTC103 N-Module is equipped with an additional DO controller adjusting the aeration
intensity to reach the calculated DO concentration. The DO control can have up to
6 different aeration stages per channel (e.g. in order to activate blower or activate discrete
aeration intensities). These aeration stages are activated by a min limit DO concentration
and the calculated DO set-point.
Option 3: RTC103 N-Module with analog DO controller
The RTC103 N-Module is equipped with an additional DO controller which, using
6 different aeration stages, adjusts the aeration intensity to reach the calculated DO
concentration. This option has two analog outputs per lane, to control up to two variable
speed drive blowers per lane.
All the above options for the RTC103 N-Module are available as single-channel (for
control of one lane) or dual-channel (for control of two lanes).