SOP FOR MAGNEHELIC DIFFERENTIAL PRESSURE GAUGES IN COORDINATION WITH AIR VENTILATION UNITS IN LABORATORY ANIMAL FACILITY

1. Purpose

This SOP outlines the proper use, monitoring, and maintenance of Magnehelic Differential Pressure Gauges in conjunction with air ventilation units to ensure optimal environmental conditions in a laboratory animal facility. The SOP ensures compliance with facility guidelines, minimizes risks, and ensures accurate pressure monitoring for the health and welfare of laboratory animals.

2. Scope

This procedure applies to all personnel responsible for operating and maintaining air ventilation systems and associated Magnehelic gauges in the laboratory animal facility.

3. Definitions

Magnehelic Differential Pressure Gauge: An analog device used to measure pressure differences across two points, typically used to monitor airflow in ventilation systems. Magnehelic gauges are commonly used for measuring low differential pressures in ventilation systems, cleanrooms, air filters, and other HVAC (Heating, Ventilation, and Air Conditioning) applications. They are known for their accuracy, reliability, and ease of use.

Air Ventilation Unit: A system that controls air exchange, temperature, and humidity in the laboratory animal facility.

4. Materials and Equipment

• Magnehelic Differential Pressure Gauges
• Calibration tools (e.g., manometer or manufacturer-specified equipment)
• Cleaning supplies (e.g., lint-free cloth, mild cleaning solution)
• Facility logbook for recording readings

5. Responsibilities

• Facility Staff: Monitor and record differential pressure readings regularly and report abnormalities.
• Facility Manager: Ensure proper installation, calibration, and maintenance of Magnehelic gauges.
• Quality Control Personnel: Verify that pressure readings align with facility standards and ensure compliance with operational guidelines.

6. Procedure

6.1 Installation

1. Install the Magnehelic gauge in a location visible and easily accessible for monitoring.
2. Ensure the gauge is mounted on a flat surface and aligned per manufacturer’s specifications.
3. Connect the high-pressure port to the area of higher pressure and the low-pressure port to the area of lower pressure using appropriate tubing.
4. Check for secure and leak-free connections.

6.2 Operation

1. Daily Monitoring:
• Observe the gauge reading during routine facility checks.
• Ensure that the pressure difference falls within the acceptable range specified by the facility’s ventilation design (e.g., +10 to +20 Pascals for positive pressure).
2. Record readings in the facility logbook, noting the date, time, and observer’s initials.
3. Investigate deviations outside the acceptable range immediately and notify the supervisor.

6.3 Calibration

1. Calibrate the Magnehelic gauge at least annually or as recommended by the manufacturer.
2. Disconnect the gauge and connect it to a calibrated reference instrument (e.g., manometer).
3. Compare readings at multiple set points:
• Adjust the gauge using the zero adjust screw if discrepancies are found.
• Document calibration results and adjustments in the logbook.
4. Reinstall the gauge and test functionality.

6.4 Maintenance

1. Clean the gauge face with a lint-free cloth and mild cleaning solution as needed.
2. Inspect tubing and connections for wear, damage, or leaks monthly.
3. Replace damaged components immediately to prevent inaccurate readings.

7. Key Points About Magnehelic Gauges

• Applications: Commonly found in ventilation systems, cleanrooms, air filters, and other HVAC applications.
• Measurement Type: Measures low differential pressures.
• Benefits: Considered accurate, reliable, and easy to use.
• Specific Uses:
• Checking filter efficiency by monitoring pressure drop across filters.
• Monitoring fan performance by measuring pressure differences across the fan.
• Assessing air flow in ducts by measuring static pressure.
• Detecting blockages in pipes by observing pressure changes.

8. Precautions

• Ensure the gauge is used within the manufacturer’s specified pressure range to prevent damage.
• Handle the gauge carefully to avoid mechanical shock.
• Always verify readings after maintenance or calibration.

9. Documentation

• Maintain a log of daily readings, calibration checks, and maintenance activities.
• Record batch numbers and calibration tool details for traceability.

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