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SOP for Calibration of Weight Box

PURPOSE
The purpose of this SOP is to provide guidelines for the calibration of the Weight Box.

SCOPE
The scope of this SOP includes calibration of Weight Box.

RESPONSIBILITY
QC Analyst: Operation of Balance and weight box.
QC Manager: Implementation of process

PROCEDURE

Visual Examination
  • 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.
  • Ensure that no weight is magnetic in nature.
  • Fractional weights should not be punctured and should be identifiable.


Analytical Balance
  • Ensure that the analytical balance used for weighing should be leveled at zero leveling and supported on a vibration-free rigid table base.
  • Ensure that a consistent ambient or fixed room temperature is maintained.
  • There should be no movement of air, like running of ceiling fan etc.
  • Ensure cleanliness of the analytical balance.

Calibration
  • Weigh one by one the standard set of weights and the weights under calibration.
  • The standard set of weights must have traceability to a nationally accredited body.
  • Repeat the weighing of each set of weights at least two or three times to ensure greater accuracy and reproducibility.
  • Ensure the precision and accuracy of weighing.

Reporting
  • Assign the actual mass value for each weight under calibration with respect to the weight of the reference set of weights.
  • Prepare a certificate comparing the results of test weight and standard weight.

ANNEXURE
Nil

REVISION HISTORY
Nil

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