Cabin Air Filter Test System（Gas Adsorption）

The Filter Test System for gas adsorption/desorption of air filters for passenger compartments (DIN 71460-2, ISO 11155-2). The Adsorption Test Stand for air filters for passenger compartments is used for quantification of adsorption capacity or desorption behaviour of filters.

The design of the Adsorption Test Stand, the test procedure and data acquisition have been based on the draft standard DIN 71460-2 and ISO 11155-2 standard for measuring the dynamic gas adsorption.

The test section and associated ductwork are fabricated from stainless steel. Different sizes of filter media samples and elements can be tested and are mounted in a special adapter. A window in front of the test section allows visual observation of the sample during the test. A pair of mass flow controllers is used for dosing gaseous components from gas cylinders and a new, sophisticated, dosing unit for liquid gas components has been developed specifically for this application. This is based on evaporation of a droplet spray atomized by means of a two-stream nozzle fed from a µl-dosing pump. The gas concentration can be measured downstream of the filter. An exhaust system bypassing the test channel facilitates maintaining a very stable gas dosing.

Test acc. to standards DIN 71460-1 and ISO/TS 11155-1

For filter tests both acc. to standards DIN 71460-1, ISO/TS 11155-1 and E DIN 71460-2, ISO 11155-2

Technical Data

Parameter	Unit	Value
Test flow rate	m³/h	70 … 700
Measuring range, differential pressure	Pa	0 … 1000
Test gases	–	n-Butane 80 ppm (C₄H₁₀), Toluene 80 ppm (C₆H₅CH₃), Sulphur dioxide 30 ppm (SO₂), Ammonia 30 ppm (NH₃), Nitrogen (purging)
Power supply	–	3 × 230 VAC, 16 A
Test specimen dimensions	mm	max. 300 × 600
Gas analysers	–	Hydrocarbons with FID, Sulfur oxides with NDIR, Nitrogen oxides with CLD
Sensors (others)	–	Temperature, relative humidity, absolute pressure
System dimensions (W × H × D)	mm	1800 × 2500 × 1100

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