SOP for Calibration of Balance

 SOP for Calibration of Balance

1.0 OBJECTIVE

To calibrate the equipment for reliable and accurate results.

2.0 SCOPE

This procedure is applicable for balance installed in the quality control department. 

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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 Operate the instrument as per respective Standard Operating Procedure.

5.2 Switch ‘ON’ the instrument.

5.3 Switch ‘ON’ the balance.

5.4 The display will blink with 8.8.8.8.8.8.

5.5 After few seconds, the display will show 0.00 g.

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5.6 If display is not stable, press the TARE key & wait till the display shows 0.00 g.

5.7 Perform internal calibration and in Annexure-II

5.6 For Accuracy

5.6.1 Place 5 gm. on the weighing pan.

5.6.2 Note the weight.

5.6.3 Calculate the difference between the weight in certificate and observed weight.

5.6.4 Repeat the above steps using 50gm & 100 gm. weights.

5.6.5 Record the reading in Annexure-II.

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5.7 For precision

5.7.1 Place 5 gm. in the weighing pan.

5.7.2 Note the weight .

5.7.3 Repeat the above two steps nine times.

5.7.4 Record the weight in Anenxure-I .

5.8 Calculate the Standard deviation.

5.9 Calculate the measurement uncertainty using following equation.

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                                                                               2 X SD

                 Measurement uncertainty = ------------------------------------

                                                                 Actual weight from certificate

5.10 Frequency

Internal calibration and accuracy = Daily

Precision: Once in a month

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6.0 ABBREVIATIONS

6.1 SD= Standard deviation

6.2 gm.= Gram