MANUALPC-2010 CHAPTER IV - OPERATION Page 33
2 - SANITIZER MENU
Input Selection
The SANITIZER function is used to monitor the concentration
of chlorine (or bromine) using two types of inputs:
• Free Chlorine sensor input for the PC7000 and PC5000,
• PPM values calculated from ORP and pH inputs for the
PC6000 and PC3000.
The SANITIZER Menu screen gives access to submenus for
control mode, sensor calibration, setpoint, low and high alarms,
and superchlorination.
Free Chlorine Control
T
he PC7000 and PC5000 controllers use the input from the
solid state Free Chlorine sensor. The sensor does not sense
bromine and is not affected by oxidizers. The displayed value
does not vary with pH.
Calculated PPM Readings
For the PC6000 and PC3000 controllers, the PPM values are
calculated from ORP and pH readings - using a CHEMTROL®
proprietary algorithm.
The algorithm is most accurate for clean water. It can be
affected by the presence of organic and inorganic
contaminants (including cyanuric acid).
In general, clean water shows higher ORP values at lower ppm
values. As the water gets dirtier, it takes more ppm to
generate the same ORP level. If it becomes excessive,
shock treatment or water replacement is needed.
2.1 - Display and Calibration
L
ine 2 displays the SANITIZER concentration in ppm (parts per
million) or mg/l (milligrams per liter), as shown on the Main
Display screen.
Free Chlorine Calibration
The Free Chlorine sensor is calibrated on startup. Its signal is
vary stable. If it need to be recalibrated, test the water with a
DPD test kit and do a second point calibration only (submenus
2.1.2.1 and 2.1.2.2).
Calculated PPM Calibration
A special 2-point calibration procedure is used for calculated
PPM values, as shown on submenus 2.1.2.1 and 2.1.2.2.
NOTE: Before recalibration, always do a partial reset of PPM
readings using the Operations Menu 8.2.5.
For a pH of 7.5, the calibration algorithm assumes a baseline
default value of 635 mV of ORP for 0 ppm (Submenu 2.1.2.1).
For heavily contaminated water, the baseline can be
readjusted to lower values. For instance, if the controller
readings are too low by 1 to 2 ppm, a baseline value of 600 mV
gives better results. For more than 2 ppm, use 575 mV.
Menu 2
Submenu 2.1.1
Submenu 2.1.2.1
Submenu 2.1.2.2
Calibrate ppm 1.5
Setpoint ppm 1.5
Alarm Low ppm 0.3
Alarm High ppm 3.0
Time Limit min 30
Run Time 15 60
Last Shock 05/01/98
Enter Measurement
from Test Kit:
1.5 ppm
Enter ORP value for
0 PPM and pH=7.5:
600
mV
from test kit:
1.5 ppm
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