16
g. Press
“Slope/Enter” key
. The mV value of the standard
solution. When the mV value of the standard solution is
stable, press
“Slope/Enter"
key to save. The ion
calibration value on the secondary screen moves up to the
next value. The first point calibration is complete and the
meter is ready for the second point calibration.
h. Rinse the ISE in distilled water and immerse it in the second
standard solution. When the mV value of the standard
solution is stable, press
“Slope/Enter"
key to save. The
ion calibration value on the secondary screen moves up to
the next value. The second point calibration is complete
and the meter is ready for the third point calibration.
[
Note
: At this moment, press the
“Mode”
key, the unit will
exit the calibration mode. Double point calibration is
complete. ]
i. To continue with the third, the fourth and the fifth point
calibration, repeat step
“h”
. Press
“Mode”
key to exit
calibration mode when the desired calibration points are
completed.
[
Note:
The slope (mV difference between two consecutive
points) is 15 to 90 mV.]
H. ION Measurements
1. Measurement in the ION-AUTOLOCK mode.
a. Connect the ISE to the BNC connector of the meter.
b. Press
“Mode”
key until “AUTO” and “MAN” icons lit up.
c. Rinse the ISE with distilled water and immerse it in sample
to be measured.
d. Press the
“Mea./Eff.”
key. The “WAIT” icon will start to
flash. The unit is waiting for a stable reading. The display
will track the ion value as sensed by the ion selective
electrode.
e. When the “WAIT” icon disappears, the reading is then
“LOCK” and will not respond to further changes from the
sample. The ion value is the sample reading.
[
Note:
For samples that are inherently unstable, the unit
will not AUTOLOCK. In this case, use the ION NON-
AUTOLOCK mode for measurements.]
