SOP For Analytical Weighing Balances RADWAG / AS 220/C/2

Scope

This SOP applies to the RADWAG / AS 220/C/2 analytical electric weighing balances for accurate and reliable measurements.

Responsibilities

Roles and Tasks

• Analyst/User/Technical Staff
  • Perform all activities as per the SOP.
  • Maintain and record activities according to the SOP.
• Analyst/DTM/TM/DQMSM
  • Draft and update the SOP to enhance compliance with Good Laboratory Practices (GLP).
• QMS Manager
  • Review and verify the SOP format.
  • Ensure SOP implementation for all activities.
• Technical Manager
  • Supervise technical procedures as per the SOP.
• Head Of Organization
  • Authorize the SOP and verify its implementation.

Terms and Definitions

• SOP: Standard Operating Procedure
• QMS: Quality Management System
• GLP: Good Laboratory Practices
• Calibration: Aligning equipment to a traceable standard under controlled conditions.
• Validation: Checking equipment performance to ensure accuracy.

Procedure

Installation

1. Power Requirements:
   • Select a site near a power source. Ensure the voltage conforms to the AC adapter specifications.
2. Installation Site:
   • Ensure the site is level, stable, and free from air currents, vibrations, sunlight, temperature fluctuations, or electromagnetic interference.
   • Adjust the balance bubble to the center using the leveling screws.

Calibration and Verification

1. Calibration:
   • Perform annual calibration or when:
     • Installation site changes.
     • Abnormal behavior is detected during weighing.
   • Use traceable standard weights calibrated by an ISO 17025:2005 accredited lab.
2. Daily Verification:
   • Conduct by trained personnel.
   • Record the temperature and humidity before and after verification.
   • Follow these steps:
     • Turn on the balance and allow it to self-check.
     • Verify using standard weights (10 mg, 100 mg, 1000 mg, and 10 g).
     • Record results in the logbook or attach printouts.

Operating Procedure

1. Ensure daily verification is complete.
2. Verify the bubble is centered and the area is clean.
3. Press [O/T] to reset the balance to 0.0000 g.
4. Place a butter paper or weighing boat on the pan and press [O/T].
5. Add the item to be weighed and note the stable reading or press the ‘Print’ key.

Preventive Maintenance and Cleaning

1. Before Use:
   • Ensure the bubble is centered.
   • Avoid working near air currents or vibrations.
2. During Use:
   • Close the glass doors when not placing or removing items.
   • Use dry spatulas and containers for weighing.
3. After Use:
   • Clean spills immediately using a damp cloth.
   • Remove the weighing pan for thorough cleaning.
4. Transport:
   • Avoid moving the balance without proper authorization.

Precautions

• Perform all activities as per the SOP.
• Ensure only trained personnel handle the balance.
• Place the balance on a stable, flat surface.
• Check the bubble before use.
• Record all activities diligently.

Calibration Schedule

• External Calibration: Annually
• Daily Verification: Before use

Related Documents

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References

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