52 A-96.250.111 / 211019
AMI Trides
Maintenance
6.7.3 Standard Redox
Our reference electrode system is Ag/AgCl. The measuring value is
roughly 50 mV higher than the calomel reference system.
The slope of the ORP electrode is not defined. To compensate the
offset of gel electrodes, a calibration can be done with one buffer
solution. Because ORP electrodes are slow, it can take some time
after calibration until the measuring value is stable again.
6.7.4 Zero Trides
If you measure concentrations > 0.1 ppm chlorine or 0.01 ppm
ozone correct the instrument after 24 h running-in. A zero point cal-
ibration is not necessary.
Let the instrument run continuously for at least 5 days in normal op-
eration before performing a zero point calibration!
Navigate to menu <Maintenance>/<Calibration> and select
<Zero Trides>. The instrument guides you through the complete
calibration process.
1 Close tap of the water inlet. Wait 30 min. (Timer counts down).
2 <Current Value> in ppm and <Offset> in µA as well as progress
of <Zero Trides> are displayed
3 Open tap of the water inlet and regulate flow.
If you have completed the required action press [Enter] to proceed.
6.7.5 Process Trides
The standard method to correct the AMI Trides is the DPD photo-
metric method. Use a high quality photometer to determine the ref-
erence value, e.g. Swan Chematest.
Take the sample from the grab sample outlet of the AMI Trides and
perform 3 manual measurements. Then calculate the average val-
ue and use it to for comparison.
You need a certain amount of disinfectant in the water to be able to
do a correction.
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