Instructions pH FUN V1
Page 20 of 28
6
Performing the pH7 calibration
Danger warning:
The regular performing of a pH7 calibration is an important prerequisite for a correct measurement
of the pH value and thus for the correct control and dosing function of the pH FUN. A missing or
incorrect pH7 calibration can have as a result a pH value in the pool water that is too high or too
low, which in the extreme case, can lead to a health hazard.
It is therefore imperative that a pH7 calibration be performed with the initial operation as well as
subsequently at least every 3 months. A new pH7 calibration must also be performed again after a
replacement of the pH electrode.
Moreover, the pH value in the pool water should be regularly tested using pH test strips or a
Phenol Red colour test (commercially available).
For the pH7 calibration, you will require the pH7 buffer solution, which is included in the scope of supply of the pH FUN.
Please follow exactly the following sequence step-by-step for the pH7 calibration:
1.
In the normal view of the pH FUN, press the
button (at least 2 seconds) to call up the menu.
2.
A screen page for the pH7-Calib. appears immediately:
pH7-Calib. OK_
7.09 pH
The currently measured pH value is displayed in this page, in the example 7.09 pH.
3.
Stop the measurement water flow through the measurement cell by closing the appropriate shut-off valve.
Open the container with the pH7 buffer solution.
4.
Remove the plastic cover of the pH FUN measurement cell and carefully unscrew the pH electrode out of the
measurement cell. Loosen the BNC connector of the electrode on the pH FUN device beforehand so that the
electrode cable does not get twisted when unscrewing the electrode. Handle the electrode by its plastic shaft
only.
5.
Rinse the electrode in clean water and then dry it carefully using a soft cloth.
6.
Now immerse the electrode in the container with the pH7 buffer solution. You should not sway the electrode but
rather immerse it to the bottom of the container and hold it as still as possible.
7.
Observe the displayed pH value on the pH FUN. After immersion in the pH7 buffer solution, it will usually
change slowly. After approx. 1-2 minutes in the buffer solution, the display should stabilise again and only
fluctuate by a maximum of 0.01..0.02 pH.
8.
When the displayed pH value for the buffer solution has stabilised, press the
button to perform the pH7
calibration.
9.
The pH measured value on the pH FUN is corrected to 7.00 pH by the calibration. After the calibration, the
value 7.00 pH should therefore appear in the display of the pH FUN, whereby slight fluctuations in the range of
approx. 6.97...7.03 pH are normal and acceptable.
10. Now press the
button again (at least 2 seconds) to return to the normal view of the pH FUN.
11. Remove the pH electrode from the buffer solution, rinse it in clean water and then dry it carefully using a soft
cloth.
12. Screw the electrode back into the measurement cell again. Tighten the electrode firmly by hand. Ensure a
secure sealing.
13. Now connect the BNC connector of the electrode to the pH FUN device again and attach the plastic covering of
the pH FUN measurement cell again.
14. Start the measurement water flow through the measurement cell again by opening the appropriate shut-off
valve.
If the pH7 calibration does not function, please observe the information in Chapter 9.5 The pH7 calibration does not
work.
