Hanna Instruments HI 931100, Instruction Manual, Page: 15 / 20

29
29
hole, add HI 8093 1M KCl+AgCl Electrolyte
Solution.
Lower the rubber sleeve during measurements
and calibration.
SODIUM MEASUREMENT
Rinse the sodium elec-
trode tip with some of
the sample to be tested
to remove any contami-
nation.
Immerse the tip (2.5 cm
/1") in the sample and
stir gently.
The sensitive bulb should
not touch the bottom of
the beaker.
The Hanna
HI 76405
electrode holder can be
used for this purpose
(see page 35).
During measurement,
the sample should be
gently stirred (approx.
100 rpm). The Hanna
HI 190M stirrer can be
used for this purpose
(see page 34).
STORAGE
When used frequently, the electrode should
be stored in a solution with a Na or NaCl
concentration similar to the sample to be
measured. For longer periods of storage, the
electrode should be capped with a few drops
of appropriate solution.
MAGNETIC STIRRER
HI 190M
POWER
SPEED
ON
OFF MAX
mannacl_r1.P65
30
30
For frequent use in different samples (1 or 2
times per week), store the electrode in
HI7081
or HI8081 (30.0 g/L NaCl) if used for NaCl
measurements (in conjunction with HI 931100
or HI 931102 ).
Store the electrode in HI7080 or HI 8080
(2.3 g/L Na) if used for Na measurements (in
conjunction with
HI 931101 ).
For occasional use (once a month or less)
store the electrode dry and let it conditioning
overnight in
HI7081 or HI8081 (30.0 g/L NaCl)
or HI 7086 or HI 8086 (23 g/L Na) before use.
Note: NEVER STORE OR RINSE THE ELEC-
TRODE IN DISTILLED OR DEIONIZED
WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. T
he cable
used for connection to the meter must be
intact and there must be no points of broken
insulation on the cable or cracks on the
electrode stem or bulb. Connectors must be
perfectly clean and dry.
If any scratches or cracks are present, re-
place the electrode.
Rinse off any salt deposits with water.
Refill the electrode with fresh electrolyte
(
HI8093) and let it stand upright for 1 hour.
Follow the Storage Procedure above.
CLEANING PROCEDURE
General Soak in Hanna HI7061 or HI8061
General Cleaning Solution for
approximately 1 hour.