Pr
o
Minent
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Page 71
Redox/ORP
8.5.4
DULCOMETER
®
D1C Measured Variable Redox/ORP and
DULCOTEST
®
Sensor for Redox/ORP, Maintenance
Controller
The
DULCOMETER
®
controller type D1C for the measured variable redox/ORP is mainte-
nance-free.
Sensor
IMPORTANT
• The sensor is to be regularly serviced to avoid any excess metering caused by a sensor
failure!
• Observe the valid national regulations for maintenance intervals!
• Do not touch the electrodes or bring into contact with greasy substances!
Maintenance interval
monthly
Maintenance
Work
The sensor should regularly (once a month) undergo a visual check and be cleaned if necessary.
If deposits on the glass electrode withstand cleaning with a soft, moistened cloth, the following
cleaning agents may be used:
Kind of deposit
Agent and duration of application
General deposits
Non-abrasive household cleaner
Scale or metal hydroxides
Diluted hydrochloric acid (approx. 0.1-3 %, 1-5 minutes)
Oil, grease
Solvents, like alcohol or acetone
Biofouling
Mixture of diluted hydrochloric acid and pepsin, several hours
Solvents (e.g. acetone) must not be used to clean electrodes as
they can demage the plastic stems.
It is essential that the sensors are rinsed thoroughly after having been cleaned.
In addition, the metal surfaces of redox sensors may be cleaned by sanding and polishing. If the
laterally arranged ceramic diaphragm of the reference electrode is blocked, it may be cleaned like
the glass electrode. In addition it may be cleaned by cautious scraping with a fi nger nail, a razor
blade or a fi ne fi le, but care must be taken that the diaphragm is not scratched.
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