Hanna Instruments HI 255 - Manual (Page 18)

18
NaCl CALIBRATION
NaCl calibration is a one-point procedure at 100.0% NaCl. Use the HI 7037L
calibration solution (sea water solution) as a 100% NaCl standard solution.
Rinse the probe with some of the calibration solution or
deionized water. Immerse the probe into HI 7037L solution.
The sleeve holes must be completely submerged. Tap the
probe repeatedly to remove any air bubbles that may be
trapped inside the sleeve.
To enter NaCl calibration select the NaCl range and
press CAL.
The “BUF” and “CAL” tags are displayed. The primary LCD will display the
NaCl reading in percentage. The secondary LCD will display “100”. The “ ”
and “~” tags will blink.
When the reading is stable, the “READY” tag will be displayed and “CFM” tag
starts blinking on the LCD, asking for confirmation.
Press CFM to confirm calibration.
The instrument stores the calibration value and returns to
measurement mode.
Note:
•
If the reading is too far from the expected value, “WRONG” “ ”
tags will blink. Calibration cannot be confirmed.
•
If the temperature of the buffer is out of 0.0 – 60.0 ºC temperature
interval, the “WRONG” and “ºC” tags will be displayed blinking.
•
If a new EC calibration is performed, NaCl calibration is auto-
matically cleared. Thus, a new NaCl calibration is required.
BUF
CAL %
NaCl
%
BUF
READY
CFM
CAL
NaCl