In high-efficiency filtration systems, even a tiny defect can compromise performance.
That’s why the leak test (Scan-Test) is one of the most critical procedures under standards like IN 1822 Und ISO 29463.
This article explains how HEPA filter leak testing works, why it is essential, and what equipment is required.
1. What Is a HEPA Leak Test?
A HEPA leak test is used to detect local defects in a filter.
Unlike overall efficiency testing, it focuses on:
- Pinholes
- Media damage
- Frame sealing issues
- Manufacturing defects
👉 Even a high-efficiency filter can fail if local leakage exists
2. What Is the Scan Test?
The scan test is a method where the entire filter surface is scanned using a probe.
Wie es funktioniert:
- Generate aerosol upstream
- Measure baseline concentration
- Move scanning probe across filter surface
- Detect local penetration
👉 Any abnormal increase in downstream concentration indicates a leak
3. Why Scan Testing Is Critical
HEPA filters are used in environments where air cleanliness is essential:
- Cleanrooms
- Pharmaceutical production
- Halbleiterfertigung
👉 In these environments:
One small leak = system failure
4. Key Parameters in Leak Testing
4.1 Aerosoltyp
- PAO / DOP commonly used
- Stable particle generation required
4.2 Scanning Speed
- Too fast → leaks may be missed
- Too slow → inefficient testing
👉 Must follow standard requirements
4.3 Probe Position
- Distance from filter surface matters
- Affects detection sensitivity
4.4 Acceptance Criteria
Typical leak criteria:
- Local penetration ≤ 0.01% (H13/H14 reference)
👉 Depends on filter class
5. Common Challenges in Scan Testing
In real applications, several issues can affect results:
❌ Unstable aerosol concentration
❌ Inconsistent scanning speed
❌ Poor probe positioning
❌ Human error in manual scanning
👉 These lead to:
- False positives
- Missed leaks
- Inconsistent results
6. Manual vs Automatic Scan Testing
| Method | Vorteile | Einschränkungen |
|---|---|---|
| Manual | Flexible | High error risk |
| Automatic | Accurate, wiederholbar | Higher initial cost |
👉 Most modern labs prefer automated systems
7. Why Professional Equipment Is Necessary
Leak testing is not just “checking”—it requires:
- Precise motion control
- Stabile Aerosolerzeugung
- High-sensitivity detection
- Data recording and analysis
👉 Without proper equipment, results are unreliable
8. Empfohlene Testlösung
Der SC-L8023 Scanning-Filtertester from SCPUR is designed for high-precision HEPA leak testing.
Hauptmerkmale
- Automated scanning system
- High-sensitivity particle detection
- Stabile Aerosolerzeugung
- Accurate positioning and speed control
👉 Stellt die Einhaltung der EN sicher 1822 und ISO 29463
9. Typische Anwendungen
Scan testing is used in:
- HEPA filter manufacturing
- Cleanroom validation
- Pharmaceutical facilities
- Semiconductor fabs
👉 Essential wherever high air cleanliness is required
10. Abschluss
HEPA filter leak testing is a critical step in ensuring filter performance and system safety.
The scan test provides:
✔ Detection of local defects
✔ Assurance of filter integrity
✔ Einhaltung internationaler Standards
