Calibration of Digital Weighing Balance

Brief Description: The Digital Weighing Balance is very sensitive instrument used for weighing substances to the milligram (0.001 g) level.

1. Purpose:
To lay down the procedure for the calibration of digital weighing balances.

2. Scope:
Applicable to digital weighing balances.

3. Responsibility:

Department Head

4. Definitions:

• Digital Weighing Balance: Digital Weighing Balance is very sensitive instrument used for weighing substances to the milligram (0.001 g) level

• Calibration: The demonstration that a particular instrument or device produces results within specified limits by comparison with those produced by a reference or traceable standard over an appropriate range of measurements.

5. Procedure:

• Switch Off the digital weighing balance.
• Clean the pan of the digital weighing balance.
• Switch On the digital weighing balance & allow it to stabilize for at least 10 minutes.
• After stabilization, check the Zero reading.
• If the Zero reading fluctuates then set Zero reading by pushing the button on the balance.
• Calibration shall be performed by putting 20 %, 40 %, 60 %, 80 % & max. weight of balance capacity.
• Place standard weights, sequentially & in ascending order, on the balance.
• Record the displayed readings in Calibration Log.
• Unload the standard weights from the pan, sequentially & in descending order, on the balance.
• If the difference is not within the limit ± 0.5% range, put the under maintenance label on the balance & arrange for repair, recertification &/or recalibration.
• If the difference between standard weight & displayed weight is more than the acceptance criteria, immediately inform to concerned dept. & investigation shall be carried out.
• Frequency : 30 Days ±  7 days
• Acceptance Criteria: ± 0.5 % of the standard weight / actual weight.
•  QA shall verify all calibration records, approve. If any deficiency is found then QA shall inform to concerned department & investigation shall be performed.

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