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Lux Meter Calibration Procedure

Purpose

The purpose of this Standard Operating Procedure (SOP) is to establish the procedures for the calibration of lux meters used in photostability studies and other light intensity measurements. Proper calibration ensures accurate and reliable readings.

Scope

This SOP applies to all lux meters used for measuring light intensity within the facility.

Responsibilities

• Stability Manager: Oversee the calibration process and ensure compliance with this SOP.
• Calibration Technician: Perform the calibration of lux meters and document the results.
• Quality Assurance (QA) Team: Review and approve calibration records and reports.

Procedure

1. Preparation:
   • Ensure that the lux meter is clean and in good working condition.
   • Gather all necessary calibration equipment, including a certified light source with a known intensity.
   • Verify that the calibration equipment is within its calibration due date and properly certified.
   • Familiarize yourself with the lux meter’s user manual and calibration procedures.
2. Initial Check:
   • Turn on the lux meter and allow it to stabilize according to the manufacturer’s
     

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     instructions.
   • Check the battery level and replace if necessary.
   • Ensure that the sensor is clean and free from any obstructions.
3. Calibration Process:
   • Place the lux meter’s sensor at a specified distance from the certified light source.
   • Activate the certified light source and allow it to reach a stable output.
   • Record the light intensity reading displayed by the lux meter.
   • Compare the lux meter reading with the known intensity of the certified light source.
   • If the reading is within the acceptable tolerance range, the lux meter is considered calibrated. If not, adjust the lux meter according to the manufacturer’s instructions and repeat the measurement.
4. Adjustment (if necessary):
   • Refer to the lux meter’s user manual for adjustment procedures.
   • Make the necessary adjustments to bring the lux meter readings within the acceptable tolerance range.
   • Repeat the calibration process to verify accuracy after adjustments.
5. Verification and Documentation:
   • Record all calibration data, including:
     • Date of calibration
     • Calibration equipment used
     • Light intensity readings before and after adjustment (if any)
     • Signatures of the personnel performing and reviewing the calibration
   • Submit the calibration records to the Stability Manager and QA Team for review and approval.
6. Post-Calibration:
   • Turn off the lux meter and store it in a clean, dry place.
   • Ensure that the lux meter is stored in a protective case to avoid damage.
   • Report any deviations or issues encountered during calibration to the Stability Manager and QA Team.
7. Record Keeping:
   • Maintain all calibration records, including reports and certificates of calibration equipment, in a centralized location for easy access and review.
   • Ensure electronic data is backed up regularly and securely stored.
   • Archive records according to the facility’s document retention policy and regulatory requirements.

Abbreviations Used

• QA: Quality Assurance
• SOP: Standard Operating Procedure

Documents

• Calibration Records
• Calibration Equipment Certificates
• Calibration Reports

References

• Lux Meter User Manual
• Manufacturer’s Calibration Guidelines

SOP Version

Version 1.0 – Effective Date: [Insert Date]

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