Hanna Instruments HI 2216 - Manual (Page 15)

15
It is recommended to calibrate the instrument frequently, especially if
high accuracy is required.
The ppm range should be recalibrated:
• Whenever the ISE electrode is replaced.
• When the ion charge is changed in SETUP menu.
• At least once a day.
• After testing agressive chemicals.
• When calibration is expired - “
CAL” “INTV” tags blink (if feature is
enabled).
Due to electrode conditioning time, the electrode must be kept submersed
a few seconds to stabilize.
PROCEDURE
Select the proper ion charge in SETUP menu (see SETUP for details, page 28).
Note: If “undF” option is selected in SETUP menu, calibration must be
performed at two points. Otherwise “ ----” message will be
displayed on the LCD.
Pour small quantities of the calibration solutions into clean beakers. If
possible, use plastic beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross-contamination, use two
beakers for each calibration solution. One for rinsing the electrode and
one for calibration.
Note: ISA needs to be added to all calibration solutions. See sensor
manual.
The instrument offers a choice of six standard solutions: 0.1, 1, 10, 100,
1000, 10000 ppm and calibration up to two points. Standards should
bracket the working range.
Remove the protective cap from the ISE electrode.
TWO-POINT CALIBRATION
• Submerse the ISE electrode approximately 3 cm
(1¼”) into the selected solution and stir gently.
• Press CAL. The primary LCD will display the ppm
value using the current offset and slope. The “ CAL”
and “ 1
BUF
” tags will appear and “ 10.0” ppm
standard will be displayed on the secondary LCD.
IIIIIS E S E S E S E S E CALIBRATION CALIBRATION CALIBRATION CALIBRATION CALIBRATION
3 cm
(1¼")