Sampling Systems / Aerosol Substances / Dryer
ISO 14644-3

SYS 529 - Rectangular Sampling Probe

Circular sampling probes are still being produced and commonly used to fulfill isokinetic flow conditions. Increasingly though, users recognise the advantages of rectangular shaped sampling probes.
Topas Sampling Probes SYS 529 have a rectangular inlet which is gradually reduced to a circular tube connector. The design of the probe is based on the EN ISO 14644, part 3 which defines a maximum width to height ratio of 1:6.
The manufacturing process ensures that all internal surfaces are polished to avoid material deposits and thereby falsifying test results.

Exact Scanning over the whole filter area
The rectangular design enables the scanning of the filter corners too unlike circular probes which inevitably miss some areas.

Sampling probe designed to EN standard for cleanrooms
Rectangular sampling probes are compulsory according to DIN EN ISO 14644, part 3, where test procedures for clean room classification are explained. Many users respond by using them.

Shorter filter testing times
The scan rate of rectangular probes is lower compared to circular shaped probes due to the lesser height of the probe. The greater width on the other hand reduces the number of runs over the filter area, which enables a shorter filter testing time.

More accurate sampling
The circular shape of conventional probes causes a systematic error due to the different scanning times as shown in the figure below. Rectangular shaped sampling probes overcome this problem and lead to an accurate measurement.

Material in contact with media Probe body: anodised aluminium;
tube connection: stainless steel
Tube connection Ø 8 mm
Design According to
EN ISO 14644-3:2005
Probe dimension length: 130 mm (235 mm incl. tube connector), additional in refer to table below
Weight approx. 170 g

These probes suit particle counters with sampling flows of 28.3 l/min (1 cf/min), e.g. Airborne Particle Counter LAP 340.
To assure isokinetics a change of the probe for different filter flow off velocities can be necessary.

Specifications SYS 529  (standard probe for particle counter with 28.3 l/min (2 cf/min))

Mean air velocity 0.45 m/s ± 10 %
Hose connection Ø 8 mm
Protective cap Available as an option

Specifications SYS 528 (for particle counter with 56.6 l/min (2 cf/min))

Mean air velocity 0.45 m/s ± 10 %
Hose connection Ø 10 mm