Instruction manual

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Status
This displays the current status of the relay output, either “Off” or “On”, and if on, the amount of
time it has been on. Possible status messages are Off, Off/Manual, On/Time counting
down/Sampling, Off/Time counting down/Holding, On/Time counting down/Blowdown, Off/Time
counting down/Waiting and On/Time counting down/Hand (for manual activation). The only
possible error messages are Interlock and Sensor Error. See section 8.1 for a complete description
of error messages.
Custom Name
This menu allows you to call the output another name if desired. Type the new name in the text
box.
Set Point
Type in the desired set point value. The control direction is always Force Lower.
Interval Time
Type in the desired time between samples. Too short a time will waste water and drop the
conductivity well below the set point. Too long a time will cause the conductivity to rise too high,
potentially resulting in scale or carryover.
Duration of Sample
Type in the desired sample time. This should be as short as possible while still guarantying a fresh
sample of boiler water at the electrode.
Hold Time
Type in the desired time to hold the water sample while it returns to boiler pressure.
Blowdown Time
Type in the desired time to blowdown if the conductivity is above the set point. Too long a time
will waste water and drop the conductivity well below the set point. Too short a time could cause
the conductivity to rise too high, potentially resulting in scale or carryover.
Mutual Interlocks
Click the check boxes to select or de-select the relays and analog output control outputs that you
want to be prevented from turning ON if this output relay is already ON. If you do not need any
other output to shut off when this relay turns on, UNCHECK all boxes. The selection is mutually
exclusive, meaning that if Relay 2 has Relay 4 interlocked, then R2 won’t turn on if R4 is already
on, and R4 won’t turn on if R2 is already on. This feature should be used with caution since it can
potentially delay a chemical addition for a long time.
Output Mode
Click on the radio buttons to manually control the relay. The normal selection will be Auto, where
the controller uses the various set points to open and close the relay. You can force the relay closed
regardless of the set points by selecting Hand, or force the relay open regardless of the set points
by selecting Off.