eutech-instruments waterproof c401 colorimeter User Manual
Calibration: Chlorine, Free & Total
C401/301/201/102/101
24
3.2
Chlorine, Free & Total
1.
Prepare a Chlorine standard in the 4.1-5.0 ppm Cl
2
range, measure
and record the concentration value.
2. Ensure the meter is switched off. 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.
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.
3.
Press the MODE key repeatedly until [CL-F] (for calibrating Chlorine
Free), or [CL-T], (for calibrating Chlorine Total), is displayed.
Free), or [CL-T], (for calibrating Chlorine Total), is displayed.
OFF
ON
ZERO
CAL
MODE
Press Mode to select
test parameter of
test parameter of
“CL-F” for Free
Chlorine or “CL -T”
Chlorine or “CL -T”
for Total Chlorine
4. Press the READ/ENTER key to confirm the selected test. The
meter will display [bLNK] indicating it is
waiting for a blanking sample.
waiting for a blanking sample.
NOTE: Blanking is compulsory during calibration; without
blanking the meter will not continue with the calibration
procedure.
blanking the meter will not continue with the calibration
procedure.
5.
Select a clean vial, unscrew the cap and fill with deionised water to
the line on the vial. Replace the cap, ensuring it is screwed on
finger tight to the vial.
the line on the vial. Replace the cap, ensuring it is screwed on
finger tight to the vial.
6.
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.
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.
7.
Press the ZERO key to blank the meter to that vial; the meter will
display [ZERo] whilst this is taking place.
display [ZERo] whilst this is taking place.
8. Remove the blanking vial from the meter. The meter displays 4.1
ppm, with the CAL annunciator on the top left corner.
9. Use the MODE key repeatedly to select the concentration of the
prepared calibration standard in the 4.1 - 5.0 ppm range.
Blanking
Sample
Sample
CAL
MODE
ZERO
CAL
ppm
Press Mode to
select calibration
point from 4.1 ppm
to 5.0 ppm in an
incremental circular
incremental circular
manner.
CAL