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SOP on calibration of pH meter

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  • Objective:
    • To lay down a procedure for calibration of pH Meter.
  • Scope:
    • This SOP is applicable for calibration of pH Meter in quality control laboratory.
  • Responsibility:
    • Officer or above of QC laboratory is responsible for calibration of pH Meter
    • Head Quality / nominee of QC department is responsible for reviewing and approval of the SOP
  • Accountability:
    • Head – Quality Control shall be accountable for compliance of SOPs.
  • Procedure:
    • Ensure the cleanliness of the instrument.
    • Clean the electrodes with purified water and wipe with tissue paper.
    • Dip the electrode in pH-7.0 solution and press the CAL 7 key. The message ‘ENTER IF STABLE ‘will show then press the ENTER key and record the results.
    • Dip the electrode in pH -4.0 solution and press the CAL 4 key, the message ‘ENTER IF STABLE’ will show then press the ENTER key .
    • Dip the electrode in pH -9.2 solution and press the CAL 9.2 key, the message ‘ENTER IF STABLE’ will show then press the ENTER key .
    • The message will show ‘Calibration complete.
    • While checking the pH of buffer 4.0, and 7.0 clean the electrode with purified water every time.
    • After use keep the electrode dipped in the purified water.
    • Calibrate the instrument daily and record the results in the format as per Annexure- I.
    • Maintain the preparation and consumption record of pH buffer solution as per Annexure- II.
    • If the results of calibration are not conforming to the specified limits report to the department Head for an appropriate action.

List of Annexure 

S.No. Annexure Title Annexure Number
1 pH Meter Calibration Record

I
2 Preparation and consumption record of pH buffer solution

II
  • References (if any).
    • Not applicable.
  • Reason for Revision
    • Not applicable due to first version.

Annexure – I

pH Meter Calibration Record

MAKE   :                                                                                                                 MODEL :

 

 

 

Date

 Standard Buffers  

 

Done By

  

 

Checked By
4.0 7.0 9.2
Limit ± 0.05 ± 0.05 ± 0.05

Annexure – II

Preparation and consumption record of pH buffer solution

 

Date of preparation

 Opening Balance Buffer tablet/Capsules    (Qty. used) Balance Qty.  

Prepared

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Checked

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4.0 7.0 9.2 4.0 7.0 9.2 4.0 7.0 9.2