Activating Platinum Electrodes - Xylem YSI TruLine ORP 51 Instrucciones De Operación

TruLine
CleaningIL
After cleaning
First-time
activation during
installation and as
required
Activation during
very long
set-up times
T 814246 04/2014
Remove water-soluble contamination by rinsing with deionized water. Re-
move other contamination as follows:
Contamination
Fat and oil
Lime and hydroxide deposits Rinse with citric acid (10 % by weight)
Rinse the combination electrode with deionized water.

Activating platinum electrodes

For the first-time activation use the activation powder from the SORT/RH
reagent set (component of the SORT/RH reagent set). Immerse the moist
(but not dripping) platinum electrode into the activation powder and rotate the
electrode several times in the powder. Then remove the activation powder
under flowing water with a soft brush (e.g. toothbrush).
W hen changing from oxidizing to reducing test solutions and vice versa this
can result in set-up times that can take significantly more than an hour. In this
case pretreatment (activation) of the platinum surface can shorten the set-up
time. The type of pretreatment (reducing or oxidizing) is based on the pH val-
ue and the ORP voltage (U
timated for the f irst measurement.
The type of pretreatment can then be determined using the following diagram
where U is based on the normal hydrogen electrode:
H
1000
U in mV
H
800
600
400
reducing pretreatment
200
0
0
Cleaning procedure
Rinse with water containing household wash-
ing-up liquid
) of the test solution where the latter must be es-
H
oxidizing pretreatm ent
2 4 6 8
Activating platinum electrodes
10 12 14
pH value
9