Hanna Instruments HI 931101, Instruction Manual

15

14

Wait for a couple of minutes
and then press the CFM key.

  • The two point calibration procedure is now com-

pleted and the meter automatically returns to the
normal measurement mode.

CFM

  • For exiting the calibration mode

and save the single point cali-
bration, press the CAL key. For
better accuracy however, it is
recommended to perform a 2
point calibration.

TWO POINT CALIBRATION

    • After the first point is confirmed,

immerse the FC 300B electrode
into the second standard solu-
tion: HI 7087 at 0.23 g/L Na or
HI  7086 at 23 g/L Na.

Note: The electrode should be

immersed approximately
2.5 cm (1") into the solu-
tion.

•

Select the calibration value by
pressing the BUF key. Make
sure that the selected value cor-
responds to the solution being
used for the second calibration
point.

  • If the reading is not close to the

selected calibration standard, the
"BUF" indicator will continue to
blink.

Otherwise, if the reading is close
to the selected calibration value,
the meter will recognize the stan-
dard solution and only the "

"

symbol will blink, to indicate that
the reading is stabilizing.

•

Once stabilized "CON" symbol
will appear on the display.

BUF

CAL

NaCl CALIBRATION (HI 931100)

Calibration can be performed at 1 (offset only) or 2
points.

For best accuracy, a two point procedure is recom-
mended.

PREPARATION

 • Pour small quantities of

HI 7083 (3.00 g/L NaCl) solu-
tion and HI  7085 (0.30 g/L) or
HI  7081 (30 g/L) into two clean
beakers.

For more accurate readings use for the second
poit the HI 7085 solution if you are going to
measure samples with low sodium chloride con-
tent (< 3 g/L), or the HI 7081 solution for samples
with high sodium chloride content (> 3 g/L).

  • For an accurate calibration, use two beakers for

each solution, the first one for
rinsing the electrode, the sec-
ond 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 7083

HI 7085

HI 7083