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.
PEOPLE ALSO READ: SOP for Cleaning Procedure of Karl Fischer Apparatus
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
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