| Operation & Maintenance Instructions TOPAX L1/L4/L5 | Metering Unit Settings
NOTE!
Chlorine measurement is pH and flow dependent. The slope rate rises with incre-
ased flow and decreases with higher pH values. Before calibrating, make sure
that the flow is constant at approx. 40-45 l/h and the pH value lies between 6.5
and 7.5, and try to ensure that both values do not change.
NOTE!
You may also take the water samples in other locations, e.g. directly in the pool.
In that case, the fact that concentration-losses may occur on the way to the
measuring site must be taken into consideration. These result in a lower slope
rate and fluctuations in concentration-losses enter into the measurement as
errors.
NOTE!
The determination of chlorine dioxide with DPD is done in exactly the same way
as that for chlorine and can be conducted using the same reagents. However,
if your photometer is not equipped with a chlorine dioxide display, you must
multiply the measurement value displayed in “mg/l Cl” by a factor of 1.9 since
photometric measuring only records the molecule count and chlorine dioxide
molecules are heavier than chlorine molecules.
NOTE!
NOTE!
NOTE!
