Hanna Instruments hi 931100 User Manual

• If the reading is not close

to the selected buffer, the
"BUF" prompt will continue
to blink.

If on the other hand, the
reading is close to the se-
lected buffer, the meter
will recognize the standard
solution. The BUF symbol
will stay still on the dis-
play, while the "

" sym-

bol will blink, indicating that
the meter is stabilizing its
reading.

• Once stabilized "CON"

symbol will appear on
the display.

Wait for a couple of min-
utes and press the CFM
key.

• The meter will return to its normal mode

and the two point calibration process is
completed.

CFM

mannacl_r1.P65

NaCl CALIBRATION (HI931100/HI931102)

The calibration is performed by immersing
the FC 300B sodium-sensitive electrode in 2
different standard NaCl solutions to achieve
accurate 2 point calibration.
It is also possible to calibrate just the offset
(3.00 g/L NaCl) following the single point cali-
bration procedure described below.
For best accuracy, a two-point calibration is
recommended (see below).

PREPARATION
•

For HI931100 and HI931102:
Pour small quantities of
HI 7083 or HI8083 (3.00 g/L
NaCl) solution and HI7085
or HI 8085 (0.30 g/L) or
HI 7081 or HI 8081 (30 g/L)
into two clean beakers.
To get accurate readings use HI7083/HI8083
and HI 7085/HI8085 if you are going to mea-
sure samples with low sodium chloride con-
tent (below 3 g/L) or HI7083/HI8083 and
HI7081/HI8081 if you are going to measure
samples with high sodium chloride content
(over 3 g/L).

• For accurate calibra-

tion, use two bea-
kers for each buffer
calibration, the first
one for rinsing the electrode, the second
one for calibration. This way, contamina-
tion of the buffer is mini-
mized. Whenever possible
use plastic beakers to mini-
mize any EMC interferences.

• Turn the meter on by

pressing the ON/OFF key.

• Remove the protective cap

of the electrode and rinse

HI 7083

HI 7085

ON/OFF