15
15
• Remove the protective cap of the
electrode and rinse 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
2.3 g/L Na solution
(
HI 7080
or
HI8080
).
Note
: the electrode
should be im-
mersed approxi-
mately 2.5 cm (1")
into the solution.
• Press the CAL key. The "CAL" and "BUF"
indicators will be displayed with the "BUF"
and the "
" symbols blinking.
• As soon as the standard
solution is recognized,
the BUF symbol stays
still while the "
"
symbol continues to
blink indicating that the
electrode is stabilizing.
The value of the stan-
dard solution being used
will be displayed on the
primary LCD.
• As soon as the electrode
is stabilized, "CON"
symbol will appear on
the display.
2.3 g/L
Na
CAL
mannacl_r1.P65
16
16
For best results, wait for a
couple of minutes before
pressing the CFM key.
•
HI 931101
will display
"0.230 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
0.23 g/L Na (
HI7087/
HI 8087
)
or
23 g/L Na
(
HI7086/HI8086
).
Note
: the electrode should
be immersed ap-
proximately 2.5 cm
(1") into the solu-
tion.
• Select the buffer value by
pressing the BUF key.
Make sure that the buffer
value selected through the
BUF key corresponds to
the one being used for the
second point calibration.
CFM
gm
°C
BUF
CAL
CAL
0.23 g/L or 23 g/L
Na
BUF