eutech-instruments waterproof c401 colorimeter 사용자 설명서

Calibration: pH

 

 

C401/301/201/102/101 

 

 

 

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11.  Select another clean vial, un-screw the cap and fill it 

with 10 ml of the pH7.0 colorless buffer. (fill up to the 
line on the vial).   

12.  Select a bottle of pH Indicator (Phenol Red) reagent. 

Unscrew the cap and holding the bottle vertically; gently 
squeeze 20 drops of reagent into the contents into the 
vial. Replace the cap onto the reagent bottle. Be careful 
not to over-tighten the cap.  

13.  Replace the cap onto the vial, ensuring it is screwed on 

finger tight.  Invert the vial several times to mix. 

14.  Gently place the vial into the sample well of the instrument, whilst 

again aligning the ▼ mark on the vial with the ▲ mark on the meter. 

15.  Wait for one minute and then press the READ/ENTER key within 3 

minutes from when the time the reagent was added to the vial. 

16.  The meter will display [--Rd--] whilst the calibration standard is being 

measured and then displays [SAVE] to prompt for calibration 
acceptance and saving of calibration data. 

pH

READ

ENTER

 

17.  Press the READ/ENTER key. The meter will now accepts the 

calibration value and momentarily display [HoLD] and CAL 
annunciator before returning to the beginning of the calibration as in 
step 4. 

18.  To continue with another calibration, press the MODE key to select 

the desired calibration mode. 

19.  To exit the calibration mode, press the ZERO key to return to the 

measurement mode. 

Press ZERO to 
return to 

measurement mode

MODE

READ

ENTER

Press Mode to select 
another calibration test 

ZERO

 

20 Drops

  

  pH

Indicator
 Phenol

   Red

10 ml 

of pH 7.0