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

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.
5.1.8 Acceptance Criteria : ± 3°C

6.0 Abbreviations

6.1 °C= Degree centigrade

ANNEXURE-I

Q. C. Department

PH METER TEMPERATURE SENSOR RECORDS

                                                                   

REF.No. :_________________ ISSUE DATE: _________________ ISSUED BY :____________________

Calibrated  Ref. Digital Thermometer No.:____________________ 

Ref. Thermometer Calibration date          :____________________

Ref. Thermometer Certificate No.            :____________________

Ref. Thermometer Calibration Due Date  : ____________________

pH meter ID.No.                                      : ___________________

Results Observed:

Set Range	Observation		Difference	tolerance
	Temperature as read on pH meter	Temperature as on read on display of Ref. Thermo.
30°C to 27°C				±0.3°C
26°C to 23°C
22°C to 20°C

Remarks                 :

Calibration date          :

Next Calibration date  :

Calibrated  by             :

Checked by                 :

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