Walchem WebMaster ONE Instruction Manual page 97

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.
If you select Off, the relay will not activate again until either Hand or Auto is selected (or if power
is cycled)! If you select Hand, the relay will activate until either Auto or Off is selected, or until
the Hand Time Limit (programmed in the next menu) expires or until the controller power is
cycled.
The Off mode is handy to prevent the relay from activating while you are changing set points. The
Hand mode is handy to be able to test the pump or valve, wiring, etc without needing to change set
points.
Hand Time Limit
Type in the text box the maximum number of minutes that the relay can be activated in the Hand
mode. Any value between 1 and 1440 is acceptable.
Click on the "Submit" button to save the changes.
Event Log
Click on the link to view the event log. The event log contains the date and time of each relay
activation and deactivation, as well as the state of each Interlock, Level Switch, or Generic digital
input.
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