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SOP for Calibration of Potentiometer

OBJECTIVE 
To lay down the procedure for calibrating Potentiometer. 

SCOPE 
This SOP is applicable to Calibration of Potentiometer being used in Quality Control Laboratory 

RESPONSIBILITY 
  • It is the responsibility of QC Executive assigned to carry out the calibration procedure fully without deviation. 
  • It is the responsibility of the Manager QC to enforce the procedure. 

PROCEDURE 
Frequency: Once in 6 months. 

  • Operate the instrument as per current version of SOP for operation of Potentiometer.
Electrode Calibration 
  • Select the method pH 
  • Clean the pH electrode with water every time before every operation 
  • Keep the electrode in pH 4.01 buffer and record the pH in Attachment-I 
  • Repeat the procedure with pH buffer solution 7.01 and 10.01 

Burette calibration 
  • Fill the bottle with purified water 
  • Select the add volume 10ml from the instrument and press the ‘START’ key. 
  • Collect the water in a previously weighed beaker and take the weight, record the results in Attachment-I 
  • Repeat the procedure 4.2.1 to 4.2.3 by taking add volume 20ml, 30ml, 40ml & 50ml 

Linearity 
  • Select the method for calibration from the instrument 
  • Take 5 different accurate weights of potassium Hydrogen phthalate (100mg, 150mg, 200mg, 250mg and 300mg) in 250ml beaker and dissolve in 100ml water 
  • Perform titration using standardized 0.1M Sodium Hydroxide 
  • After completion of the titration take the print outs of the results 
  • Calculate correlation coefficient and record the results in Attachment-I 

ATTACHMENTS 
Calibration report of Potentiometer 
An Image/Link below is provided (as is) to download Annexure.
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REVISION HISTORY 
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