Calibration of pH Meter

1.0 PURPOSE

The purpose of the standard operating procedure is to provide guidelines for calibration of pH Meter.

2.0 SCOPE

The scope of this standard operating procedure includes calibration of pH Meter.

3.0 RESPONSIBILITY

3.1 Section In-charge

3.2 Technical Manager

3.3 Q.A. Manager

4.0 PROCEDURE

Calibration of an indicator reference electrode combination is undertaken by the standardization of the pH meter with different buffer solutions and measuring the response by a immersing the combination electrode in different pH buffer solutions.

4.1 STANDARD REQUIRED FOR CALIBRATION / VERIFICATION:

4.1.1 Prepare the buffer solutions of pH 4.0, 7.0 and 9.2 respectively using standard buffer capsules E. Merckmake.

4.1.2 Switch on the instrument and allow it to stabilize for 20 to 30 minutes.

4.1.3 Under the stipulated operating conditions measure the pH of the different buffer solutions allowing the reading to stabilizes before reading the pH.

4.1.4 Adjust the pH meter according to the pH observed.