Ise Calibration - Hach sension 4 Instruction Manual

SECTION 3,
continued

3.3 ISE Calibration

4. When the reading has stabilized, the standard number will
change to .
2
5. Press The adjusted offset value, the slope, and the
EXIT.
and icons will appear. Verify the offset value (isopotential
?
point) is within the range specified in the electrode manual.
6. To save the adjusted calibration and return to the reading
mode, press
ENTER
and return to the reading mode, press
Calculation for ISE values does not require temperature
compensation, so a temperature probe is not necessary for ISE
testing. However, a temperature probe will still function properly
and display the correct sample temperature. Use the 5-pin
temperature probe available from Hach, Cat No. 51980-00.
1. Prepare standards according to the electrode instruction
manual or the instructions for the standard. Use two to five
standards for calibration. Pour 25 mL of each standard into a
50-mL beaker.
2. Turn the instrument on. Select the desired channel and the
BNC connector (Setup 1). If necessary, press the
to get into the ISE reading mode (the last concentration units
entered will be displayed).
3. Press . Functional keys will appear in the lower left part
CAL
of the display.
CAL, ?
4. To change the units, use the arrow keys to scroll to the
desired choice (g/L, mg/L, µg/L, ppm, ppb, M). Press
5. Add ionic strength adjustor to 25 mL of the least
concentrated standard.
6. and
Standard, 1
has been calibrated, the last value for standard 1 will appear.
The numeric keypad will become active.
7. Place the ISE electrode in the standard with the lowest value.
While measuring, stir the solution slowly and steadily.
34
. To exit the calibration without saving it
, and flashing units will appear.
will appear in the upper display. If the meter
Store
.
EXIT
key
ISE/mV
ENTER.