QCI-001 Operation of Weighing Balance

• PURPOSE

• To define a procedure for operation of the weighing balance.

• SCOPE

• This SOP applies to the Quality Control Department.

• REFERENCE(S) & ATTACHMENTS

• References:

  • In-house.

• Attachments:

  • Nil.

• RESPONSIBILITY

• QC Department Head:

  • To prepare the SOP.

  • To confirm the content, correctness, and detailing of the SOP.

• QA Head:

  • To approve the new or revised SOP.

  • To ensure implementation of the defined system.

• DISTRIBUTION

• Quality Assurance.

• Quality Control.

• DEFINITION(S) & ABBREVIATION(S)

• Definitions:

  • Least Count: the lowest weight that can be measured accurately by the weighing balance. Below this value, accuracy is not guaranteed.

• Abbreviations:

  • Nil.

• PROCEDURE

• Before starting the analytical weighing balance, ensure that it is leveled properly.

• Switch on the balance and wait till the startup process is complete.

• Start the daily verification process.

  • Place the standard weight of 2 gm at the center. Check the value; it should be within the 1.980-2.020 range.

  • Place the same weight on the edges of the pan and check that the value falls within the acceptable range. Repeat the process at four different edge positions.

  • Record the observation in the specified format.

• Once verification is OK, start using the balance for job samples. Ensure zero before placing weight on it; if it is not showing zero, press the zero button to make the reading zero.

• Place the weight (sample/specimen) and let the reading stabilize. Take the reading as per the least count of the weighing balance, 0.001 g.

• For best results, keep the cabinet of the balance closed while taking the reading.

• REVISION HISTORY

+----------------+----------------+----------------+----------------+----------------+----------------+ | Revision No. | 00 | Effective | | CC No. | | | | | Date | | | | +----------------+----------------+----------------+----------------+----------------+----------------+ | Details of revision: New SOP | +-----------------------------------------------------------------------------------------------------+