Thermo Fisher Scientific C101 Colorimeter - Manual (Page 47)

Calibration: Cyanuric Acid
C401/102 Colorimeter
43
OFF
ON
ZERO
CAL
MODE
Press Mode to
select test
parameter of
“CYNA” for
Cyanuric Acid
Blanking
Sample
CAL
MODE
ZERO
CAL
ppm
Press Mode to
select calibration
point from 66
ppm to 75 ppm in
an incremental
circular manner.
3.3 Cyanuric Acid
1. Prepare a Cyanuric Acid standard solution in the 66 - 75 ppm range
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. For the single-parameter colorimeter (C102), the display will show
[CYNA]. For the multi-parameter colorimeter (C401), the display will
indicate the last test performed. Press the MODE key until [CYNA] is
displayed.
Cyanuric Acid calibration mode selection (Multi-Parameter Colorimeter)
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, 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.
6. Ensure the outside of the vial is clean, dry and absent of any marks
or finger-prints. Gently place 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.
9. The meter displays 66 ppm, with CAL annunciator on top left corner.
10. Use the MODE key repeatedly to select the concentration of the
prepared calibration standard in the 66 - 75 ppm range.
CAL