SOP for Calibration of pH Meter Temperature Sensor
1.0 Objective
To provide a standard operating procedure for the calibration of pH meter temperature sensor.
2.0 Scope
This procedure is applicable to pH meter.
3.0 Responsibility
3.1 Doing: Technical Assistant/Executive
3.2 Checking: Executive /Manager
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4.0 Accountability
Head of the Department
5.0 Procedure
Frequency: Twice in Year.
5.1 Calibration Procedure for pH meter temperature sensor
5.1.1 Keep the sensor probe of reference calibrated digital thermometer in the beaker containing water for injection (WFI) / purified water (PW) of about temperature 35°C.
5.1.2 Add cold WFI/PW slowly drop wise and bring the temp. between 27°C to 30°C.
5.1.3 Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in format as Annx. I.
5.1.4 Add WFI/PW in some more quantity slowly drop wise to bring the temp. between 26°C to 23°C.
5.1.5 Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in format as Annx. I.
5.1.6 Add cold WFI/PW slowly drop wise and bring the temp. between 20°C to 22°C.
5.1.7 Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in format as Annx. I.
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5.1.8 Acceptance Criteria : ± 3°C
6.0 Abbreviations
6.1 °C= Degree centigrade
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