Verderdos ME - DUAL - PH/CL Manual De Regulatión página 21

A AMPEROMETRIC CHLORINE PROBE CALIBRATION
Attention, It will be necessary to do a comparative free chlorine test (for example a DPD1 photometric test)
Zero Calibration is executed at factory and then go directly to RECOMMENDATIONS paragraph.
The pump is been projected so that the electrical zero probe calibration is equal to electrochemical zero calibration.
So if it's really necessary to calibrate the zero of the probe read the following instructions:
-disconnect the chlorine probe input from the pump
1)wait until the display reaches a stable reading(any value)
Push and quickly release CAL button 2 times and then push + button and confirm by CAL..Scroll the menu by + and
– buttons till the display shows "Cl Calibration" Push CAL to enter the submenu and then the button – to do the
OFFSET calibration of the probe. If it is necessary you can modify the value shown in the second row of the display
by buttons + or – till 0.00ppM reading. Push CAL to confirm.
Do a DPD1 test on the water sample taken from the Tap of the probe holder. Push and quickly release CAL button 2
times and then push + button and confirm by CAL.Scroll the menu by + and – buttons till the display shows "Cl
Calibration" Push CAL to enter the submenu and then the button + to do the GAIN calibration of the probe. If it is
necessary you can modify the value shown in the second row of the display by buttons + or - till the value is equal to
that of DPD1 tester. Push CAL to confirm. If the display shows the message "Calibration Impossible" the probe
calibration is not saved. Read the following paragraph named "MESSAGES FROM THE PUMP". If no error message
appears the calibration has been performed.
Rev 1.0 Cod. 00.009.038
RECOMMENDATIONS:
GAIN calibration, PAY ATTENTION TO
THE FOLLOWING INSTRUCTIONS:
1) it is necessary to stabilize the water
flow by turning the knob regulation till the
floater stays in the upper position (60l/h).
This is important because the right water
flow rate allows the glass spheres to clean
adequately the cupper surface.
2) Before calibrating the GAIN of the
chlorine probe, stabilize the pH at the
working conditions.(We recommend to
choose a value from 7.0 to 7.3pH) .
3) It is necessary to do the Chlorine gain
calibration at concentration values nearest
possible to the desired setpoint.
For example if the chlorine concentration
desired is 1.20ppM
recommended to do the gain calibration
with water in those conditions. Use a
DPD1 photometric test to check the
chlorine concentration in the water
sample taken from the Tap (see the
figure on the left)
GAIN CALIBRATION
It is recommended to do the gain
calibration after at least 2 or 3 hours of
optimal working
alternatively it is possible to do a first
gain calibration after having installed
the pump and the probe in the plant
and then do the definite calibration
after 24 hours of work of the probe.
After having stabilized the flow and the pH
and having stabilized
concentration at the optimal and desired
value, wait for the stabilization of the
reading on the display.
before doing
it is strictly
conditions, or
the chlorine
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