Operation of pH meter (Model pH scan-2)

1.0 OBJECTIVE
To lay down a procedure for operation of pH­ meter (Model pH scan-2).
2.0 SCOPE
This SOP is applicable to Formulations Units
2.1.0 AREAS
2.1.1 D.M. plant.
3.0 RESPONSIBILITY
Jr. Technical Officer / Executive (production)
4.0 ACCOUNTABILITY
Manager - Production
5.0 PROCEDURE
5.1.0 Precautions
5.2.0 Pre Startup
5.3.0 Calibration
5.4.0 Operation.
5.1.0 Precautions
5.1.1 Do not dip the pH meter more than the minimum immersion level.
5.1.2 E1 on display indicates, “Ensure that the battery is changed”.
5.2.0 Pre Startup
5.2.1 Ensure the cap of pH meter is removed.
5.2.2 Ensure the pH meter is calibrated before usage.
5.3.0 Calibration
5.3.1 Calibration to be done with the help of standard buffer solutions of pH 4, 7 and 10.
5.3.2 Calibrate initially with buffer solution of pH 7.
5.3.3 Select a standard buffer of pH 7.
5.3.4 Press the ON/OFF button on the key pad to turn on the pH meter.
5.3.5 Press the “CAL” button to enter calibration mode.
5.3.6 Dip the pH meter electrode up to the immersion level.
5.3.7 Stir the pH meter gently and wait for the displayed valve to stabilize.
5.3.8 Press “HOLD/ CON” button to confirm and complete the calibration.
5.3.9 Repeat the same procedure for buffer solution of pH 4 and pH 10.
5.4.0 Operation
5.4.1 Dip the pH meter electrode up to the immersion level.
5.4.2 Press the ON/OFF button on the key pad to turn on the pH meter.
5.4.3 Stir the pH meter and wait the display to stabilize.
5.4.4 Observe and record the pH.
5.4.5 Press the ON/OFF button to switch off.
5.4.6 Rinse the pH meter well with purified water.