SOP for Calibration of Halogen Moisture Analyzer

1.0 OBJECTIVE

To calibrate the equipment for reliable and accurate results.

2.0 SCOPE

This procedure is applicable to Halogen Moisture Analyzer, installed in the quality control department.

3.0 RESPONSIBILITY

3.1 Doing: Technical Assistant
3.2 Checking: Executive /Manager

4.0 ACCOUNTABILITY

Head of the Department

5.0 PROCEDURE

5.1 For the Temperature Calibration:

5.1.1 Operate the instrument as per S.O.P.
5.1.2 Set the temperature 60°C by providing temperature key.
5.1.3 Insert the calibrated thermometer of suitable range from top side to near temperature sensor.
5.1.4 After constant temperature achieved, observe the temperature in thermometer and record it in Annexure.
5.1.5 Same way set the temperature 105°C & 150°C & observe the temperature & record it in Annexure.

5.2 For Accuracy of Drying:

5.2.1 Place approximately 0.2gm of water.
5.2.2 Start the instrument & observe the results.
5.2.3 Repeat the test two time again & record the observed result in Annexure.

5.3 For the Balance Calibration:

5.3.1 Press ‘MENU’ key & select w.cal :yes by ‘Ù’ or ‘Ú’ key & enter by ‘← ’ key.
5.3.2 After few seconds w.cal : 50.000gm will appear.
5.3.3 Open the sample chamber by pressing ‘×’ key & remove the sample pan holder.
5.3.4 Put calibrated 50gm weight.
5.3.5 Wait till w.cal 0.000 appear, replace 50gm weight.
5.3.6 Collect the printout of weight calibration & record the observation in Annexure.

5.4 For Accuracy of Balance:

5.4.1 Remove the sample pan holder.
5.4.2 Place 1 gm weight & note the weight.
5.4.3 Calculate the difference between the weight in certificate & observe the weight.
5.4.4 Repeat the above steps using 2 gm & 5 gm weights.
5.4.5 Record the observed weight in Annexure.

5.5 For Precision:

5.5.1 Place 500mg weight & note it.
5.5.2 Repeat the above steps nine times.
5.5.3 Record the weight in Annexure.
5.5.4 Calculate the standard deviation
5.5.5 Calculate the measurement uncertainty using the following equation.

 =               2  x  SD                    

                  Actual weight from certificate 

5.6 Frequency: Once in three months.

6.0 ABBREVIATIONS

6.1 SD = Standard deviation
6.2 gm. = Gram
6.3 mg = Milligram
6.4 Temp.= Temperature

ANNEXURE

QUALITY CONTROL DEPT.

CALIBRATION RECORD OF HALOGEN MOISTURE ANALYZER

CALIBRATION DATE	DATE OF LAST CALIBRATION DONE	NEXT DUE FOR CALIBRATION

INSTRUMENT DETAILS
INSTRUMENT NAME	INSTRUMENT MAKE	INSTRUMENT IDENTIFICATION NO.

OBSERVATION

(A)  Balance Calibration :

(1)  For Precision

Sr. No.	Theoretical weight	Actual weight from certificates	Observed weight	Measurement uncertainty	Tolerance
1	500 mg				Not more than 0.10
2
3
4
5
6
7
8
9
10
SD=

OBSERVATION

Sr. No.	Internal Calibration With 50 gm	Nominal value of weight	Actual weight from certificate	Observed    weight	Tolerance +0.2% at Actual weight
1		1 gm
2		2 gm
3		5gm

(B)    Temperature Calibration :

(1)   

Sr. No.	Setting Temperature 0C	Observed Temperature 0C	Tolerance + 20C
1	60
2	105
3	150

(2)  Accuracy of Drying  :                 

Sr. No.	Taken weight of water in mg	% of water	Limit 100 + 2%
1
2
3

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