Calibration of Weight Box

 

1.0  PURPOSE  

       The purpose of the standard
operating procedure is to provide guidelines for calibration of

        Weight Box.

 

2.0  SCOPE

       The
scope of this standard operating procedure includes calibration of Weight
Box.

 

3.0  RESPONSIBILITY

3.1  Application Scientist

3.2  QA Manager

3.3  Director Technical

 

4.0  PROCEDURE

4.1  VISUAL EXAMINATION

4.1.1  Check and clean the weights under calibration
for the quality and finish of surfaces and

         
edges, freedom from foreign /extraneous matter and the closeness of the
screw knob. 

4.1.2
 Ensure that no weight is magnetic in
nature.

4.1.3  Fractional weights should not be punctured
and should be identifiable.

 

4.2     ANALYTICAL BALANCE:

4.2.1  Ensure that the analytical balance used for
weighing should be levelled at zero levelling

         
and is supported on a vibration free rigid table base.

4.2.2  Ensure that a consistent ambient or fixed
room temperature is maintained.

4.2.3  There should be no movement of air, like
running of ceiling fan etc.

4.2.4  Ensure cleanliness of the analytical balance.

4.3       CALIBRATION

4.3.1   
Weigh one by one the standard set of weights and the weights under
calibration.

4.3.2
The standard set of weights must have traceability to a national accredited
body.

4.3.3  
Repeat the weighing of each set of weights at least two or three times
to ensure greater

accuracy and reproducibility.

4.3.4
   Ensure the precision and accuracy of
weighing.

 

4.4       REPORTING

4.4.1   Assign the actual mass value for each weight
under calibration with respect to the weight

of the reference set of weights.