Hanna Instruments HI 4101 - Manual (Page 28)

8
VIII. VIII. VIII. VIII. VIII. Inner Electrode Check Inner Electrode Check Inner Electrode Check Inner Electrode Check Inner Electrode Check
Before assembling the electrode for the first time first time first time first time first time or if
reactivating it after storage, the inner electrode assembly
should be conditioned and then tested as a pH electrode.
Prepare pH test solutions HI 4000-47-4 and HI 4000-47-
7 by mixing and dissolving each buffer packet in separate
containers with 50 mL deionized water. These pH solutions
contain chloride ions and pH buffers that are used to verify
the inner electrode (pH internal) is operational. See
Section XVII for replacement accessories and maintenance
items.
For a new sensor:
Remove the protective shipping cap from the glass inner
electrode.
For existing sensor:
Unscrew the upper cap on the top of the electrode and
carefully withdraw the internal pH/reference assembly.
Use test
tube or
graduated
cylinder
(weighed
Bottom) when
testing or
conditioning
pH internal
Test buffer
can be
used as a
conditioning
solution
for the
pH internal
Protective shipping cap
For stable readings, glass should be covered to the
bottom of the long black band.