14
Note: The instrument will automatically skip the buffer used for the first point.
• After the first calibration point is confirmed, immerse the ISE electrode
approximately 4 cm (1½”) into the second calibration solution.
• If necessary, press the ARROW keys to select a different buffer value.
• The “ ” tag will blink on the LCD until the reading is
stable.
• When the reading is stable and close to the selected buffer, the
“READY” tag will be displayed and the “CFM” tag will blink.
• Press CFM to confirm calibration.
• The instrument stores the calibration value and returns to
normal measurement mode.
Note: • If the mV value is out of the mV range (±2000), “WRONG” “
”
and “WRONG” “ ” tags will blink alternately. In this case, check if
the correct buffer has been used or refresh the electrode by following
the Cleaning Procedure (see page 34). If necessary, change the
buffer or the electrode.
• If the new slope is out of the slope window, “WRONG” “
” and
“WRONG” “ ” tags will blink alternately. In this case, check if the
correct buffer has been used or refresh the electrode by following
the Cleaning Procedure. If necessary, change the buffer or the
electrode.
Slope window is between ±20 mV and ±105 mV if ion charge
is not specified (undF option in SETUP menu) or between 50%
and 120% of default slope for the corresponding ion charge.
Default slope value (mV/decade):
–59.16 (monovalent anion) - ion charge is –1
59.16 (monovalent cation) - ion charge is 1
–29.58 (divalent anion) - ion charge is –2
29.58 (divalent cation) - ion charge is 2
100 - ion charge is “undF”
• Press SET/CLR during calibration if you want to clear calibration
values and set to default. The instrument will display “CLR”
message and will return to measurement mode.
• Press RANGE to display the temperature reading on
the LCD during calibration.
ONE-POINT CALIBRATION
• Press CAL after first calibration point was confirmed. The instrument memorizes
the one-point calibration parameters and returns to measurement mode.
