Integrity testing of HEPA filters - Cleanroom technology
HEPA filters are capable of removing 100% of airborne particulate above 5m. Below that, they are less efficient and typically will remove 95% to 99.9995% in the 0.15m to 0.25m particle size range. The grade of the filter chosen for the application determines the overall filtration capability.
Integrity testing of HEPA filters: A practical approach
Typically, HEPA filters capture up to 99.97% of particles as small as 0.3 microns. The dispersed oil particulate (DOP) scan testing, also known as filter integrity testing, or leak testing, is one of the most quoted methods by industry standards.
CMI: Filter integrity testing - aerosol photometer and generator
CMI sells and rents aerosol generators and portable ATI (Air Techniques International) photometers designed for many applications in the pharmaceutical, biotechnology, healthcare, nuclear and dismantling industries as well as for use by professionals working with asbestos and asbestos removal.
DOP/PAO Testing of HEPA Filtered Equipment - Hazmasters
What is a DOP/PAO test? A process that challenges HEPA filtered equipment to ensure it is safe to use in hazardous environments. An aerosol generator is used to convert DOP or PAO oil to an aerosol with particle sizes down to .3 micron. A photometer then measures the amount of particulates in the exhaust air stream.
DOP Testing For Cleanrooms | Modular Cleanrooms By Total
Total Clean Air uses an innovative, advanced and digital aerosol photometer to to perform DOP tests. We have portable DOP testing machines guaranteed to maximise efficiency and minimise downtime. The photometer measures the amount of aerosol downstream and upstream of the filter. The result shows the performance of the HEPA filter.
- What is the size of Pao generated aerosol?
- The size of PAO generated aerosol ranges from 0.1 to 1.0 μm. The PAO aerosols are generated by the aerosol generator and passed through the HEPA filter then the integrity is checked using a photometer. 99.97% particles having a size larger than 0.3 μm should not be passed through HEPA filters. Poly alpha olefin is a polymer of alpha-olefin.
- Where is PAO aerosol introduced?
- PAO aerosol is introduced on the upstream side of the HEPA to be tested. For HEPA in the HVAC system, achieving uniform aerosol concentration at the filter requires the direct introduction of aerosol from the negative pressure side of the system fan. Suppose the introduction is to be done through the air duct.
- How do you use Pao & DOP in a high-efficiency air filter?
- 3. Use an aerosol generator to cast challenge particles upstream, and inject PAO or DOP into the upstream of the high-efficiency air filter. The particle concentration is about 10 to 20 micrograms of PAO or DOP per liter of air.
- What is polyalphaolefin (PAO) used in HEPA filter integrity test?
- Know more about the Polyalphaolefin (PAO) used in HEPA filter integrity test during HVAC system qualification including their molecular structure. Poly Alpha Olefin (PAO) is used for HVAC qualification in pharmaceuticals. PAO is used as a replacement of the DOP (Dioctyl Phthalate) that was used for this purpose for a long time.
- What is Pao / DOP leak detection?
- The specific instructions are as follows: PAO or DOP leak detection belongs to the aerosol photometer test method Aerosol Photometer: The digital aerosol photometer test method was the earliest test method, but because of its very good effect, it is still used today.
- What is Pao testing in clean room HEPA filters?
- PAO testing is the primary method for leak test in clean room HEPA filters. High-efficiency particulate air filters, known as HEPA filters, typically boast a collection efficiency exceeding 99.97% for particles sized 0.3 micrometers or larger. Employed as terminal filtration devices in cleanrooms, they ensure the provision of purified air.
