Operational Guide 25
Preparation
Pour a small quantity of the calibration solution into a beaker. If possible, use a
plastic beaker to minimize any EMC interferences.
Before pressing CAL verify in SETUP:
• Basic mode is o .
• Salinity Scale is set to NaCl%.
In measurement mode use the RANGE key to select the Salinity measurement.
The NaCl% tag will be on. NaCl calibration is a single point calibration at 100.0%
NaCl. Use the HI 7037L calibration solution (sea water solution) as a 100% NaCl
calibration solution.
Procedure
Rinse the probe with some of the HI 7037L calibration solution or deionized
water. Shake o excess solution. Submerse the probe in the calibration solution.
The sleeve holes must be completely submersed. If possible, center the probe in
the beaker away from the bottom or beaker walls. Raise and lower the probe to
re ll the center cavity and tap the probe repeatedly to remove any air bubbles
that may be trapped inside the sleeve.
Press CAL to enter calibration. The ”
“, ”STIR” and
“CAL” tags will turn on and the rst LCD line will
display the percent NaCl reading, the second LCD line
will display the temperature and the third LCD line will
display ”WAIT” message blinking until the reading is
stable.
When the reading is stable and close to the standard,
“CFM” tag will blink and “SOLUTION STANDARD”
message will be displayed.
Press CFM to con rm calibration.
The Instrument displays “SAVING”, stores the calibration values and returns to
measurement mode.
Note: If a new EC calibration is performed, the NaCl calibration is automatically
cleared. A new NaCl calibration is required.
Wrong Standard
If the reading is too far from the expected value, the
message “WRONG STANDARD” will scroll. Calibration
cannot be con rmed. In this case check if the
calibration solution has been used correctly or clean
the probe by following the instructions for EC PROBE
MAINTENANCE (see page 33).
NaCl %
Calibration
Calibration
Messages
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