Hach-Lange 5303 - Manual (Page 4)

4
pH electrode 53 03
Introduction
The 53 03 is a low maintenance pH electrode
recommended for clean waters.
SAFETY NOTE
Before use with hazardous substanc-
es, find out about the relevant haz-
ards, protective measures, and what
to do in an emergency.
Electrode preparation
• Remove the storage protector
.
• Verify that there are not air bubbles inside
the membrane . They can be removed
by shaking the electrode as a clinical ther-
mometer.
Installation
In immersion, insertion, flotation housings,
etc. with PG 13,5 thread.
See Housing instruction manual.
In some cases the electrode is installed, with
the help of sockets and adapters, directly
onto pipes.
Cable. They are connected to coaxial cables
with an AS9 connector.
Calibration
See pH-meter instruction manual.
Measurements. Recommendations
See pH-meter instruction manual.
Ensure that the electrode’s specifications are
adapted to the process.
Sample must cover the diaphragm
.
Maintenance
• Deposits forming on the electrodes,
caused by continual exposure of the sen-
sors to a dirty or contaminated medium, is
one of the most frequent causes of prob-
lems when measuring pH. When possible
it’s recommended to use a housing with
automatic sensor cleaning system.
• When an electrode gets contaminated,
the simple rinsing with distilled water is
not suffi cient. The most suitable cleaning
solution is one which acts in a more selec-
tive way over the contamination (look for
regeneration solutions).
• Re-hydration. A “dry” electrode recovers
by immersing it in diluted HCl solution for
several hours. It is recommended to read
the information supplied with the elec-
trode’s regenerating solutions.
Troubleshooting
... the meter always shows the same pH
value.
Short circuit in the electrode or cable.
Substitute the cable or the electrode.
... shifting of pH values.
Reference system contamination.
Replace the electrode
... unstable reading.
Diaphragm blockage.
Clean, regenerate, replace the elec-
trode.
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