Description
ISO 29463-1 requires for all HEPA /ULPA filters with an efficiency of 99.95% or higher (ISO 35H/H13) the following test to ensure filter quality:
• local efficiency according to ISO 29463-4
• overall efficiency according to ISO 29463-5
The LFT 2000 combines the requirements of ISO 29463-4 Annex F for Class 35 H filters with a simple manual test procedure.
The system manually detects possible leakage points easily and quickly with the appropriate software.
The output of the test report is for local filter efficiency as well as for leak detection.
Norms and certificates
National and international standards
ISO 29463-4 ISO 29463-5
Operation principle
Manual scantest with for HEPA/ULPA filter
The test system consists of the following components:
• Supply air duct with volume flow measurement and raw gas sampling
• Horizontal filter holder (adapter for different filter sizes)
• Aerosol generator
• Sampling and integrated photometer for manual scanning by hand in the clean gas
First, the intake air flows through the built-in filter at a defined volume flow rate. In the process, the particle counter measures the particle concentration and size on the raw gas side.
Subsequently, the pressure drop is measured with a scan over the filter surface. At the outlet side, the operator guides the sampling probe across the downstream side of the filter. Thus, he scans the local emission and size of the particles in the clean gas using the particle counter. Leakage points are thus detected quickly and easily.
The test report is generated after successful testing of the local filter efficiency.
Extensions/Accessories
Aerosol generation
We recommend the PLG 2100 H with Laskin nozzle for the highest constancy in aerosol generation
Particle counters
Optical particle counters with airflow of 28 l/min (1 cfm), measurement range selectable either from 0.1 µm or 0.3 µm
Scanning Probe
Specially designed according to ISO 29463 for scanning velocities up to 5 cm/s (or 0.093 m²/min)
Scanning unit
Manual scan
“Worry-free package” for delivery
Acceptance at Palas® as well as delivery, installation, instruction, and final approval on-site
