EUTECH INSTRUMENTS CD 650, Instruction Manual

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Use standard solutions of 0.001, 0.01, 0.1, 1, 10, 100, 1000 & 10000 ppm for
calibration. You need to calibrate minimum of 2-points. See “For Ion” under
“Preparing the Meter for Calibration” on page 18.
1. Switch on the meter. Make sure the meter is in Ion measurement mode.
2. Press
CAL (F2) to go to calibration mode.
3. The meter shows the ‘Calibration-Rinse Electrode’ screen for a few
seconds and then shows the Ion calibration screen.
Figure 24 : Ion Calibration Screens
4. Dip the ISE in calibration solution. The tip of the probe must be completely
immersed into the solution. Stir the probe gently to create a homogeneous
solution.
5. The calibration screen displays two readings. The upper display shows the
lowest calibration point 0.001 ppm. The lower display shows the absolute
mV reading of the solution without any calibration (default reading). Use
& keys to select the required calibration point in the upper display.
6. Allow time for the reading to stabilize. Press ENTER key to confirm the
selected point. The meter flashes the upper display to acknowledge the first
point calibration.
Note: If the meter is password protected, you will be prompted to enter
a password.
Note: If there is an existing ion calibration in the meter, you will be given
two options:
ƒ Clear the previous calibration (CLR-C) – choose this if you
wish to delete all previously calibrated points and re-calibrate
with a new type of ion.
ƒ Retain the previous calibration (NEXT) – choose this if you
wish to retain previously calibrated points and re-calibrate new
points (or overwrite existing points) with same type of ion.