Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual

Page: 41 / 288

SFC
Functions
4.
41
4. Functions
4.1 General
The SFC is a special measuring and control device for use in the
treatment of potable water, industrial process water and pool
water.
Two different versions of the unit are available (see chapter 3.1),
which differ in terms of their inputs and outputs.
Version 1 supports all of the applications described in chapter 3.1.
Due to the restricted number of inputs and outputs, version 2 only
works in application 3.
Typical applications:
• Measurement and registration of water parameters
• Flow-controlled potable water chlorination (compound loop)
• Flow-controlled fluroide dosing (compound loop)
• pH single feedback closed-loop control
• Chlorine single feedback closed-loop control
• Quantity-proportional dosing of disinfectants (single feed
forward)
• Quantity-proportional dosing of disinfectants with linearization
of the actuator (with positioner)
Possible process measurements (only with applications 1 and 2)
are:
free chlorine, combined chlorine, total chlorine, chlorine dioxide,
potassium permanganate, ozone, pH, Redox, fluoride,
conductivity
As an option, two additional control signal inputs can be installed
to log flow rate and external setpoint using compound loop or
single feed forward.
Please note
For the simultaneous recording of process measurements (Cl
2
,
pH, ...) and flow-controlled dosing of chemicals (single feed
forward, compound loop), it is necessary to use sensor measuring
modules with the „Process Control“ option (see 4.5 “Applications”).