19
19
it with some of the buffer calibration
solution you are going to use first.
• Lower the rubber sleeve to get the
junction to work properly
SINGLE POINT CALIBRATION (OFFSET)
• Dip the
FC 300B
sodium
electrode into the 3.00 g/L
NaCl solution (
HI 7083
or
HI8083
).
Note
: the electrode should
be immersed ap-
proximately 2.5 cm
(1") into the solu-
tion.
• Press the CAL key. The
"CAL" and "BUF" indica-
tors will be displayed with
the "BUF" and the "
"
symbols blinking.
• As soon as the standard
solution is recognized, the
BUF symbol will stay still
while the "
" symbol
will continue to blink indi-
cating that the electrode
is stabilizing.
The value of the standard
solution being used will be
displayed on the primary
LCD.
• As soon as the electrode
is stabilized, "CON" sym-
bol will appear on the dis-
play.
For best results, wait for a
couple of minutes before
CAL
CAL
3 g/L
NaCl
mannacl_r1.P65
20
20
pressing the CFM key.
HI931100
and
HI931102
will then display "30.0 gm".
• If the CAL key is pressed
at this point, the calibra-
tion process is ended pro-
viding only one point cali-
bration. For better accu-
racy however, it is recom-
mended that a two-point
calibration is performed.
TWO POINT CALIBRATION
• Proceed as described in "Single Point Cali-
bration" but do not quit calibration by press-
ing the CAL key.
• After the first point is con-
firmed, immerse the
FC 300B
electrode into the
second buffer solution at
0.3 g/L NaCl (
HI 7085/
HI8085
)
or
30 g/L NaCl
(
HI7081/HI8081
).
Note
: the electrode should
be immersed ap-
proximately 2.5 cm
(1") into the solu-
tion.
CFM
CFM
gm
°C
NaCl
BUF
CAL
CAL
CAL
0.3 g/L or 30 g/L
NaCl