Chlorine, Free & Total - EUTECH INSTRUMENTS WATERPROOF C401 COLORIMETER Instruction Manual

Calibration: Chlorine, Free & Total
Chlorine, Free & Total
3.2
1. Prepare a Chlorine standard in the 4.1-5.0 ppm Cl
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.
3. Press the MODE key repeatedly until [CL-F] (for calibrating Chlorine
Free), or [CL-T], (for calibrating Chlorine Total), is displayed.
ON
OFF
ZERO
4. 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.
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.
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.
7. Press the ZERO key to blank the meter to that vial; the meter will
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.
ZERO
CAL
Blanking
Sample
CAL
CAL
ppm
24
C401/301/201/102/101
range, measure
2
Press Mode to select
test parameter of
MODE
"CL-F" for Free
Chlorine or "CL -T"
for Total Chlorine
CAL
Press Mode to
select calibration
point from 4.1 ppm
MODE
to 5.0 ppm in an
incremental circular
manner.