What is aerosol photometer
The installed filter leakage test aerosol photometer is a precision optoelectronic instrument designed to detect and measure the concentration of airborne suspended particles. It is specifically used for precision testing to verify the installation integrity of High-Efficiency Particulate Air (HEPA) and Ultra-Low Particulate Air (ULPA) filters in cleanrooms, biosafety cabinets, and HVAC systems. The instrument is primarily used for on-site verification of the integrity of installed HEPA/ULPA filters and their sealing frames, ensuring that no aerosol leakage occurs.
Features
- Three-level user management and audit trails to ensure data integrity
- Aerosol concentration detect range up to 700μg/L
- Built-in large capacity lithium battery, working continuously for 4 hours
- High-definition 5-inch color touch screen for convenient interaction
- Support DOP, PAO and other aerosol types
- Printing data via a built-in thermal printer
- Supports system upgrade or data export via USB flash drive
- A large-capacity data storage, saving sampled data in real time
- Support visual, auditory and vibration alarm after exceeding the set value
- Error detection, automatically protecting the instrument
- Small, lightweight, and portable
- Traceable test value, calibrated by Junray calibration setups.
Reference Standards
- ISO 14644-3
- GMP
- GB 50591-2010
- NSF/ANSI 49-2024
- BS EN 12469:2000
- IEST-RP-CC034
- JJF 1815-2020
- JJF 1800-2020
Aerosol Photometer Working Principle
Upstream Aerosol Generation: A test aerosol (such as PAO, DEHS, or DOP particles) with a specific concentration and particle size distribution is introduced via an aerosol generator at the inlet side (upstream) of the HEPA filter.
Light Scattering Measurement: The instrument draws in air through a sampling probe and utilizes the principle of light scattering; as the particle-laden airflow passes through the photometer’s dark chamber, the particles scatter the light source, and the instrument converts this scattered light into electrical signals using a photomultiplier tube or photodiode.
Leak Detection: Penetration rate is calculated by comparing upstream and outlet-side (downstream) concentrations or by directly scanning the downstream frame and filter media surface. If the detected penetration rate exceeds the established standard limit (typically 0.01%), a physical breach or seal leak is indicated.
Aerosol Photometer Applications
Pharmaceutical Industry: HVAC validation for sterile cleanrooms, pass-through boxes, laminar flow hoods, and HVAC systems.
Healthcare: Hospital operating rooms, biosafety cabinets (BSCs), and isolators.
High-tech and Nuclear Industries: Semiconductor wafer fabs, nuclear facilities, and other controlled environments with extremely stringent air cleanliness requirements.
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