SOP for Calibration of pH Meter Temperature Sensor

SOP for Calibration of pH Meter Temperature Sensor

Standard operating procedure for the calibration of pH meter temperature sensor using water for injection (WFI) / purified water (PW).

 

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

  Doing: Technical Assistant/Executive

  Checking: Executive /Manager

 4.0 Accountability : Head of the Department

Procedure Frequency: Twice in Year.

Calibration Procedure for pH meter temperature sensor. 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.

Add cold WFI/PW slowly drop wise and bring the temp. between 27°C to 30°C.

Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in 

format as Annx. I.

Add WFI/PW in some more quantity slowly drop wise to bring the temp. between 26°C to 23°C.

Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in 

format as Annx. I.

Add cold WFI/PW slowly drop wise and bring the temp. between 20°C to 22°C.

Compare the temp. shown by reference calibrated digital thermometer and pH meter & record it in 

format as Annx. I.

Acceptance Criteria : ± 3°C

 5.0 Abbreviations

  °C= Degree centigrade

 

ANNEXURE-I

Q. C. Department

PH METER TEMPERATURE SENSOR RECORDS

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   :