Get the latest updates from us for free
Mobile Apps



SOP for Calibration of Balance


Standard operating procedure to evaluate the performance of Analytical Balance used for the analysis in quality control.

1.0  OBJECTIVE

       To calibrate the equipment for reliable and accurate results.

2.0  SCOPE

       This procedure is applicable for balance installed in 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  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.
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.

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.
                                                                               3 X SD
                 Measurement uncertainty =    ------------------------------------
                                                                 Actual weight from certificate

5.10  Frequency

         1 Internal calibration and  accuracy =Daily
         Precision  : Once in a month

6.0  ABBREVIATIONS

6.1  SD= Standard deviation
6.2  gm.= Gram



ANNEXURE-I
QUALITY CONTROL LABORATORY

CALIBRATION REPORT OF  BALANCE
CALIBRATION DATE

DATE OF LAST CALIBRATION DONE
NEXT DUE FOR
CALIBRATION





INSTRUMENT DETAILS
INSTRUMENT NAME

INSTRUMENT MAKE

INSTRUMENT
IDENTIFICATION NO.





OBSERVATION

   Weight box Id.No.:__________________

   For Precision
Theoretical
Weight
Actual weight from
Certificates
Observed weight
Measurement
uncertainty
Tolerance
5gm.







Not more than 0.001










                                                  SD:


ANNEXURE-II
Q. C. DEPARTMENT
DAILY CALIBRATION RECORD
NAME OF  THE INSTRUMENT    :  BALANCE
MAKE                                                :  ADAIR DUTT
MODEL  NO                                     :  AD-180                                 
IDENTIFICATION NO.                   :
Weight box Id.No.:________________
Accuracy:
Date
Internal
calibration
Observed
wt for 5gm
Difference
Observed
wt for 50gm
Difference
Observed
wt for 100gm
Difference
Calibrated
by.

Checked
by







































Limit :
No.
Theoretical weight
Actual weights from certificates
Tolerance
1
5 gm.

+/- 5mg
2
50.0 gm.

+/- 5mg
3
100.0gm.

+/- 5mg



Ads by Yahoo!

Write Your Valuable Comment Below ...

Post a Comment