Filter Media Test Rig

The Filter Media Test Rig is designed for the characterization of cleanable filter media, enabling measurements according to ISO 11057. The system is suitable for dust loading tests, fractional and gravimetric efficiency determination, and quality assurance of filter media. Its modular and flexible design allows for customization and extension for small-scale filter tests along general standards.

Applications

(1) Dust loading tests according to ISO 11057.

(2) Small-scale filter tests based on other general standards.

(3) Development and optimization of filter media.

(4) Quality assurance during production and incoming inspection.

Standards

(1) ISO 11057 – Air filter media – Dust loading test method for cleanable media.

Features

(1) Long-term stable dosage and dispersion of test dust Pural NF.

(2) Flexible design facilitates quick modifications and future extensions.

(3) Compatible with a wide variety of test aerosols (solid particles, liquid droplets, atmospheric dust).

(4) Integration of Topas instruments ensures optimum performance and cost-effectiveness.

(5) Fully computer-controlled operation via user-friendly PAFWin software.

Principle

The filter medium is mounted in a dedicated holder and exposed to a controlled flow of test aerosol. The aerosol generator (e.g., ATM 220) provides stable particle or droplet dispersion. A laser aerosol spectrometer (e.g., LAP 323) measures particle concentration upstream and downstream to determine efficiency, while the differential pressure across the medium is monitored to assess dust loading and pressure drop.

Technical Data

Accessories

(1) Atomizer Aerosol Generator ATM 220

(2) Laser Aerosol Spectrometer LAP 323

FAQ

(1) What is this system for?

– Characterization and dust loading testing of cleanable filter media.

(2) Which standards does it comply with?

– ISO 11057 for dust loading tests.

(3) What types of filter media can be tested?

– Flat sheet cleanable filter media suitable for small-scale testing.

(4) How is aerosol generated?

– Via atomizer aerosol generators (ATM 220) for solid or droplet aerosols; laser spectrometer measures particle concentrations upstream and downstream.

FAQ (Filter Media Test Rig, B2B Focused)

(5) Which standards are applicable for filter media testing?

A filter media test rig is typically designed to comply with ISO 16890 (general ventilation filters), EN 1822, and ISO 29463. The applicable standard depends on the intended application, such as HVAC systems or high-efficiency filtration.

(6) What performance parameters should be measured?

The system measures filtration efficiency versus particle size, pressure drop (initial and loaded), dust holding capacity, and airflow resistance stability. These parameters are defined in ISO 16890 and ISO 29463 and are required for product validation and comparison.

(7) What particle size range must the system cover?

The equipment must cover the most penetrating particle size (MPPS), typically within 0.1–0.3 μm, as required by EN 1822 and ISO 29463 for high-efficiency media. For general ventilation filters under ISO 16890, broader particle size ranges up to PM10 are also required.

(8) How is test accuracy and repeatability ensured?

Test accuracy depends on stable aerosol generation (such as NaCl or oil-based aerosols), precise airflow control, and calibrated particle counters. Under controlled conditions defined by ISO 29463 and ISO 16890, a well-designed system typically maintains repeatability within ±5%.

(9) What should be considered when selecting a filter media test rig?

Selection is based on airflow range, face velocity control, particle size measurement capability, and compliance with calibration standards such as ISO 11171. The system should also support different sample sizes and allow flexible testing of both flat media and pleated filter configurations.