eutech-instruments waterproof c401 colorimeter Manuel D’Utilisation

Calibration: Cyanuric Acid

 

 

C401/301/201/102/101 

 

 

 

27

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. 

Press the MODE key repeatedly until [CYNA] is displayed. 

OFF

ON

ZERO

MODE

Press Mode to 

select test 

parameter of 
“CYNA” for 

Cyanuric Acid

 

4. 

Press the READ/ENTER key to confirm the selected test. The meter 
will display [bLNK] indicating it is waiting for a 
blanking sample.  

  

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 the CAL annunciator on the top left 
corner. 

10.  Use the MODE key repeatedly to select the concentration of the 

prepared calibration standard in the 66 - 75 ppm range. 

MODE

ZERO

ppm

Press Mode to 

select calibration 

point from 66 
ppm to 75 ppm in 

an incremental 
circular manner.