Instruction manual

73
Makeup Volume
(only appears if Feed Mode is selected as Feed Based On Makeup Volume)
Type in the text box the volume of makeup water that needs to enter the system in order to trigger
the inhibitor feed. Any value between 1 and 10,000 is acceptable.
Time Per Unit Volume
(only appears if Feed Mode is selected as Feed Based On Makeup Volume)
Type in the text box the amount of time for the inhibitor feed pump to run, once the previously
specified volume of makeup water has entered the system. Any value between 1 and 1440 minutes
is acceptable.
If you are feeding based on Multiple Sources, this menu will appear once for each makeup water
source.
Set Point
(only appears if Feed Mode is selected as Other 4-20 mA input 5)
Type in the text box the value at which you want the feed relay to close. When the control mode is
based on a 4-20 mA input, the set point value is limited to the range of the 4-20 mA input. Click
on the link called Scaling to set the range of the 4-20 mA input.
If you are feeding based on Multiple Sources, this menu will appear once for each makeup water
source.
Control Direction
(only appears if Feed Mode is selected as Other 4-20 mA input 5)
Click on the radio button to select between “Force Lower” or “Force Higher.
Dead Band
(only appears if Feed Mode is selected as Other 4-20 mA input 5)
Type in the text box the value away from the set point at which the feed relay will close. For
example, if you are forcing the inhibitor concentration higher, and your set point is 20 ppm and
your dead band is 1 ppm, then the feed relay will close at 20 and open at 21 ppm. The purpose of
the dead band is to prevent rapid cycling of the relay open and closed, which can shorten its life.
The dead band should be set for the lowest value that still prevents the relay from chattering.
Reset Timeout
(only appears if the Output Time Limit below has been exceeded)
There is a button called “Reset Timeout” which is used to reset the output if it has been activated
for longer than the time limit imposed in the “Output Time Limit” menu described below.
Current Makeup Source
(only appears if Feed Mode is one of the Multiple Sources types)
This menu displays the current makeup water source, as determined by comparing the makeup
conductivity to the ranges set up for each makeup water source. If it indicates “N/A”, then the
makeup conductivity measured is not in any range defined for a makeup water source.