P H - EUTECH INSTRUMENTS WATERPROOF C401 COLORIMETER Instruction Manual

Calibration: pH
pH
3.4
1. Ensure at least 10 ml of clear pH7.0 buffer is available.
2. Ensure the meter is switched off.
3. Press and hold the ZERO key while switching the meter on by
pressing the ON/OFF key. The meter will momentarily flash the
model number and then display the CAL annunciator at the top left
corner of the screen indicating the instrument is in calibration mode.
4. Press the MODE key repeatedly until [PH] is displayed.
ON
OFF
ZERO
5. Press the READ/ENTER key to confirm the selected test. The meter
will display [bLNK] indicating it is waiting for a
blanking sample.
Note: blanking is compulsory during calibration; without
blanking the meter will not continue with the calibration
procedure.
6. Select a clean vial, un-screw the cap and fill with de-ionised water to
the line on the vial. Replace the cap, ensuring it is screwed on finger
tight to the vial.
7. Ensure the outside of the vial is clean, dry and absent of any marks
or finger-prints. Gently push the vial fully into sample well of the
instrument, whilst aligning the ▼ mark on the vial with the ▲ mark on
the meter.
8. Press the ZERO key to blank the meter to that vial; the meter will
read [ZERo] whilst this is taking place.
9. Remove the blanking vial from the meter.
10. The meter displays 7.0 pH, with the CAL annunciator on the top left
corner.
ZERO
Blanking
Sample
C401/301/201/102/101
CAL
CAL
30
Press Mode
to select test
MODE
parameter of
"PH"
CAL
pH