SOP for Operation and Calibration of the DBK Digital pH Meter

To lay down a procedure for Operation and Calibration of the DBK Digital pH Meter. 

This procedure is applicable for pH Meter installed in Quality Control Department, at XYZ Limited. 

Execution : Chemist and above – QC department. 
Checking : Asst. Manager and above – QC department 

  • Ensure that the instrument is clean and free from dust. 
  • Press power ‘ON/OFF’ switch at the rear panel to ‘ON’ position. 
  • Connect the electrode to appropriate terminals at the rear panel. 
  • Press “Stand - by”/”Read” button to read the pH of solution. 
  • When not in use Keep the apparatus in Stand By mode and store the electrode in 4M KCl solution  
Frequency: Daily 
  • Connect the combination pH electrode and the temperature probe to the input socket. 
  • Switch ON the mains. 
  • Switch ON the instrument. 
  • Wash the electrode already dipped in KCl solution with distilled water 
  • Dip the electrode in 7.0 pH buffer. 
  • Adjust with ‘CALIBRATE’ control knob till the digital display shows the precise pH value of the buffer solution. 
  • Now move the function electrode switch to ‘STD BY’ position. 
  • Remove the electrode from the buffer solution and wash it with distilled water. 
  • Dip the combined electrode into another buffer solution (say 4 pH). 
  • Set the function electrode switch to ‘pH’ position 
  • Adjust the slope correction control on the front panel of instrument until the instrument shows the pH value of the selected buffer solution. 
  • Repeat the above steps for pH measurement of buffer solution 7.0 
  • Record the observation in the annexure Annexure-01. 
  • When not in use store the electrode in 4M KCL solution. 
  • Acceptance Criteria: ± 0.05 pH 

Annexure No. - 1 -- Daily Calibration Record of pH Meter
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SOP : Standard Operating Procedure 
Q.A : Quality Assurance 
Q.C : Quality control 

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