Xylem Sentix ORP 900 - Manual (Page 9)

SenTix Wear parts and accessories
19 ba75845e01 08/2009
Note
Detailed information on activating platinum electrodes, such as how to pro-
duce the chlorine solution, is given in the WTW application report entitled R
E -
GENERATING ORP ELECTRODES . The application report is included in the
SORT/RH reagent set.
Wear parts and accessories
Oxidizing pretreat-
ment Immerse the platinum electrode for two to three
days in a sulfuric acid chlorine solution. Chlorine
powder for producing the solution is included in the
SORT/RH reagent set.
Note: The diaphragm must not be immersed in the
chlorine solution!
Reducing pretreat-
ment When the electrode is ready for the test immerse it
in the RH 28 ORP buffer solution and wait for a sta-
ble measured value.
1000
800
600
400
200
2 0 4 8 10 12 14 6
0
pH value
U
H
in mV
oxidizing pretreatment
reducing pretreatment
Description Model Order no.
Reference electrolyte solution 3 mol/l KCl,
Ag
+
free (250 ml)
KCl-250 109 705
Reagent set for regenerating ORP platinum
electrodes
,consisting of 10 g activation powder and 30 g
chlorine powder SORT/RH 109 730
ORP buffer solution for checking ORP elec-
trodes
U
H
= 427 mV, bottle of 250 ml
RH 28 109 740
Pepsin cleaning solution,
3 bottles of 250 ml each PEP/pH 109 648