11
10
If the electrode is used rarely (once a month or
less), store it dry. Before using it again, let it
condition overnight in HI 7081 (30.0 g/L NaCl) or HI
7086 (23 g/L Na 1M)
To avoid very long response time, do not store
or rinse the electrode with deionized water. Do
not rub the electrode.
gm
°C
NaCl
TAKING pNa MEASUREMENTS (HI 931101 only)
Press the MODE key during measurement to con-
vert the value displayed by the HI 931101 to pNa.
Note that
pNa = -log a
Na
where a
Na
is the activity of ion Na.
Press the MODE key again to return to g/L mea-
surements.
TEMPERATURE MEASUREMENTS
Connect the temperature probe to
the meter and turn on.
Dip the HI 7662 temperature probe
into the sample. Allow the reading
to stabilize.
Note: The temperature is always
displayed on the secondary
LCD.
AFTER USE
Turn the meter off by pressing the
ON/OFF key again.
For faster and accurate measurements, the electrode
should be stored in a solution with a Na/NaCl concen-
tration similar to the sample to be measured.
After use, shift back upwards the
rubber sleeve (see picture).
°C
MODE
