SKC 225-68 Operating Instructions Manual

Page 1

007-04-002 Issue D January 2013

www.skcltd.com

DPM Cyclone Sampler 225-68

Operating Instructions

About the DPM Cyclone Sampler

The SKC DPM cyclone is manufactured from
conductive plastic which dissipates electrical
charges to the surrounding atmosphere and
prevents static interference on the collection
of dust particles.

An extended retaining ring and special sealing
arrangement enables the DPM cassette to be
fitted to the cyclone sampler.

In this application the purpose of the cyclone
sampler is to remove the larger, non-respirable
particles prior to the inlet of the DPM cassette
to prevent blockage of the fine impactors built
into the DPM cassette.

Design flow rate when sampling with the DPM
cyclone and DPM cassette is determined by
the performance of the DPM cassette, see
below.

About the DPM Cassette

The DPM (diesel particulate matter) cassette,
(SKC part number 225-317) is supplied pre­assembled and sealed, and is designed for
single use.

The DPM cassette’s built in impactor
assembly screens out particles ≥ 1.0 µm at
a design flow rate of 2.0 litre/min. All smaller
particles are captured on the sample filter.

The cassette also contains a blank filter.

Please also refer to the instructions supplied
with the DPM cassette.

Page 2

007-04-002 Issue D January 2013

Loading the DPM cassette

As the DPM cassette is pre-assembled,
all that is required to prepare it for use is
to remove the red plugs from its inlet and
outlet ports. Retain the plugs to seal the
cassette for transport to the laboratory.

Assemble the grit pot, thick O ring and
insert to the cyclone body. Seat the
DPM cassette into the red sealing cup
in the base of the cyclone insert, as
shown to the right. Fit the thin O ring
into the recessed channel in the base of
the outlet funnel. Place the outlet funnel
centrally on top of the DPM cassette
and then fit the retaining ring, screwing
it down firmly to ensure a good seal of
the inlet and outlet of the cassette.

Sampling with the cyclone

Connect the cyclone outlet to the sample
pump via a length of flexible tubing.
Calibrate the pump flow rate using a
rotameter or other suitable calibrator.
Connect the rotameter to the sample air
inlet on the cyclone body with a length of
flexible tubing. The sample flow rate for the
DPM cyclone and DPM cassette is 2.0 litre/
min. Once the flow is set to the correct rate
switch the sample pump off. The sample
train is now ready for sampling.

After sampling

Unfasten the retaining ring and remove
the cassette. Immediately refit the red
plugs to the inlet and outlet ports of the
cassette to prevent unwanted ingress
or loss of contaminant during transport
to the laboratory. It is not necessary to
supply a blank to the laboratory as the
DPM cassette contains a built in blank.

Retaining
ring

Outlet funnel

Air out
to pump

Thin O ring

DPM
cassette

Cyclone
insert

Thick O ring

Cyclone
body

Grit pot

Sample
air inlet

SKC Limited 11 Sunrise Park, Higher Shaftesbury Road, Blandford Forum, Dorset DT11 8ST United Kingdom

T: [phone] F: [phone] E: [e-mail] W: www.skcltd.com

A member of the SKC global group of companies