STANDARD OPERATING PROCEDURE LAB EQUIPMENT DIGITAL PH METER

STANDARD OPERATING PROCEDURE

SUBJECT :                     LAB EQUIPMENT DIGITAL PH METER

DEPARTMENT           : QA SOP NO.                      : Page No                       : Effective Date             : Next Review                : SOP REVISION           :

1.0       OBJECTIVE:

To provide guidelines for Operation & Maintenance of Digital P^H meter

2.0       POLICY: 

To ensure establish a procedure for operating of digital P^H meter.

      

3.0       PROCEDURE:

3.1       Switch on the power supply and allow the instrument to warm up for 15 min.

3.2       P^H meter should always be in “Switch on mode” during working hours.

3.3       Switch “on” the equipment. Remove the electrode from the water; wipe out the water on the electrode using tissue paper than rinse the electrode with CO₂ free water than wipe out with tissue paper.

3.4       Immerse the electrode in one of the buffer solution, adjust the temperature control and adjust the calibration control to the observed pH value identical with the buffer solution under examination, by shaking it slowly.

3.1         Takeout the electrode washed with CO₂ free water, wipe it with tissue paper.

3.6        Repeat the procedure using second buffer solution.

3.7       Place the electrode the third buffer solution and check the pH without adjusting the calibration control at same temperature.

3.8       Note down the pH readings of the solutions in Calibration register before making necessary adjustment.

3.9       The readings of all three buffers should not differ more than 0.05 units.

3.10     If the difference is more than 0.05 units examine the electrodes & if they are faulty, replace the     electrode.

3.11     Immerse the electrode in P^H 9.20 buffer solutions and check the display value. If there is any error, adjust the knob to set to read P^H 9.20.

3.12     Rinse and wipe the electrode and immerse in the sample solution of which P^H is to be measured and   read the pH value on display.

3.13     Always keep the electrode immersed in distilled water.

3.14     Standardize the instrument before use.

4.0       FREQUENCY:  As and when required.

5.0       RESPONSIBILITY:  Executive Q.A.

6.0       REVIEW GUIDE: Calibration register. Cross Check daily before use.

7.0       ANNEXURE: -------

8.0       SOPs DISTRIBUTION:

            This SOP shall be distributed to following Departments:

Name of the Department	Master Copy	Circulatory Copy
QA/QC	√	√
Production	x	x
Warehouse	x	x
General	x	x
Maintenance	x	x