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.
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. The test is recommended to be repeated at regular time intervals to verify the continued efficiency
Integrity testing of HEPA filters - Cleanroom technology
Integrity testing of HEPA filters. 17-May-2006. In situ aerosol filter testing is a black art to many, but the new ISOEN14644-3 Test Methods standard incorporates two in situ test methods that are discussed here by Neil Stephenson of DOP Solutions. The industry is still subject to large costs through in situ filter test failures that can result
HEPA FILTER INTEGRITY TEST SOLUTION
The materials and instruments for DOP leak detection are: dust source (PAO solvent), aerosol generator, and digital aerosol photometer. It uses air directly without compressed gas for power. Under the working pressure of 20Pa, when the airflow rate is 50~2025f3/min, it can produce polydisperse submicron oil dust aerosol with a concentration of
Filter Leakage Testing Using Analog and Digital Photometers
TDA-2G – Measuring concentration using a digital photometer. This is where digital units are more versatile than analog. TDA-2G digital units provide three Internal Reference settings: P1 for DOP, P2 for PAO, and P3 a factor for alternative liquids. If mineral oil is to be used and the systems under test are normally tested with DOP, the
- Which digital photometer is best for testing HEPA filters?
- The Rigel RI7001 digital photometer is the best choice for testing the integrity of HEPA filters. Using the light scattering method, the Rigel RI7001 provides real-time integrity through detection of aerosol concentration upstream and downstream.
- Which digital aerosol photometer was used?
- The digital aerosol photometer used was a GTI Model 3990 with a dynamic measurement range of 0.00005~120ug/L and a sampling flow of 1F3/min (28.3L/min). Introduce PAO aerosol on the upstream side of the HEPA to be tested
- How to use aerosol photometer for HEPA Hood & ultra-clean bench?
- For HEPA on laminar flow hood and ultra-clean bench, the aerosol is directly introduced from the negative pressure side of the system fan. Digital Aerosol photometer initialization, set 100%, 0% reference standard value Initialize and set alarm value according to the aerosol photometer operation requirements.
- How do you scan a HEPA filter?
- Remove the HEPA diffuser and scan the entire filter face, between the filter and the frame, between the frame and the frame, and between the frame and the plenum. When scanning, the sampling head is about 1 inch (about 2.54cm) away from the filter surface, and the scanning speed does not exceed 5cm/s.
