Hanna Instruments HI 931100 - Manual (Page 7)

13 12
SINGLE POINT CALIBRATION (OFFSET)
• Dip the FC 300B sodium elec-
trode into the HI 7080 (2.3 g/L
Na) solution.
Note: Immerse the electrode
approximately 2.5 cm
(1") into the solution.
• Press the CAL key. The "CAL" and "BUF" indi-
cators will be displayed with the "BUF" and the
"
" symbols blinking.
• As soon as the standard so-
lution is recognized, only the
"
" symbol continues
blinking to indicate that the
electrode is stabilizing. The
required standard solution be-
ing value is displayed on the
primary LCD.
• As soon as the electrode sta-
bilized, the "CON" symbol ap-
pears on the display.
Press the CFM key to save
the calibration point. For best
results, wait for a couple of
minutes before confirming.
• HI 931101 will display "0.230
gm".
CAL
CFM
gm
°C
BUF CAL
Na CALIBRATION (HI 931101)
Calibration can be performed at 1 (offset only) or 2
points.
For best accuracy, a 2 point procedure is recom-
mended.
PREPARATION
• Pour small quantities of
HI7080 (2.3 g/L Na) solution
and HI 7087 (0.23 g/L Na) or
HI 7086 (23 g/L Na) into two
beakers.
For accurate readings, use for the second point
the HI 7087 solution if you are going to measure
samples with low sodium content (below 2.3 g/
L), or the HI 7086 standard if you are going to
measure samples with high sodium content (over
2.3 g/L).
• For accurate calibration use
two beakers for each solu-
tion, the first one for rinsing
the electrode, the second one
for calibration.
If possible, use plastic beakers to minimize any
EMC interferences.
• Turn the meter on by press-
ing the ON/OFF key.
• Remove the protective cap and rinse the elec-
trode with some of the calibration solution you
are going to use first.
• Shift downwards the rubber
sleeve for a properly working
junction (see picture).
HI 7080 HI 7087
HI 7080
ON/OFF
HI 7080 HI 7080
RINSE CALIBRATION