Chemtrac Systems, Inc.
Page 25
The Offset function is used to automatically zero the current reading. Once an
optimum chemical dosage has been obtained, the user can null the reading so
that the setpoint becomes referenced to zero for easier interpretation (see Setup
Screen Menu).
y
Coagulant Pump Control Mode
Mode: AUTO or MAN
PID Control Output: 0-100.00%
SP (Setpoint): SCV control setpoint (-1000 to +1000)
z
Function Keys – There are four main menu selections across the bottom for the
four buttons below. The four menus are:
SETUP – SCV Setup Menu
ALARM – Alarms Status
FLUSH – Sensor Flush Control Menu
CTRL – Coagulant Pump Control and Flow Based Control Menu
Pressing one of the keys directly below these menu selections accesses the
functions within that menu.
{ Special Function Key – For the coagulant pump control mode, the control mode
can be toggled between AUTO and MAN by pressing both q and p keys at the
same time. When AUTO is present, the instrument is operating in automatic
mode, sending a control signal to the coagulant pump. When MAN is present,
the instrument is operating in manual mode, sending a control signal to the
coagulant pump, which corresponds, to the manual value. The manual control
value can be changed by the operator by pressing the p or q key, see Section
3.7 for more detail.
3.3.2 SCC3500XRD Setup Menus
From the MAIN screen, press SETUP function key, the SETUP screen will display.
Within the SETUP screen menu, the GAIN, OFFSET, SCV ALARMS, and SCV Filter
settings can be modified. The SETUP Menus are the same for SCM2500XRD and
SCC3500XRD see Sections 3.2.2 and 3.2.3 for detail descriptions.
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