User Guide

2322
• Pour a small quantity of
the chosen conductivity so-
lution into a beaker.
• Immerse the HI7686 probe
into the solution submerg-
ing the holes of the sleeve
into the liquid. Immerse
the HI7669/2W temperature
probe as close as pos-
sible to the conductivity
probe. Wait for 2 or 3 min-
utes for the thermal equi-
librium.
• Press the ENTER key to
confirm the selected buffer value and the "
BUF
"
prompts will appear on the large display and
the " " symbol will start blinking. Wait
approximately 30 seconds for the reading
to stabilize.
• When the value is
stable, " " and
"CAL" symbols will
disappear and the
"CON" symbol will
start blinking to
prompt the user to
confirm the reading.
• Press the CON key to
confirm the calibration
and the instrument will
switch to normal opera-
tion.
ENTER
CONDUCTIVITY
%TC
S
m
CAL
BUF
CONDUCTIVITY
%TC
S
m
BUF
CON
CON
• Press the CAL key and "12.88 mS" prompt
starts blinking with the "CAL" symbol fixed
on the display, to indicate that the buffer
value can be selected.
Once CAL is pressed, the %TC will be set
automatically to1.9%.
• It is possible to operate with the four dif-
ferent standard buffers provided, or to
manually choose a different buffer through
the keyboard.
CALIBRATION WITH STANDARD BUFFERS
• Select a different buffer value (between
the 80 mS/cm and 12.88 mS in the mS/
cm scale or 1413 µS/cm and 84µS/cm in
the µS/cm scale) by pressing the %TC
key. The different buffer values will blink
on the primary display.
CAL
CONDUCTIVITY
CAL
%TC
S
m
CONDUCTIVITY
CAL
%TC
S
µ
%TC
.
CONDUCTIVITY
CAL
%TC
S
m
%TC
.