Operating Instructions
Cassette outlet
Support pad
Filter
Cassette ring (middle)
Cassette adapter
(25 or 37 mm, supplied
assembled with cyclone body)
Bowl adapter (supplied
assembled with cyclone body)
Nodule for holder
Retaining tab
Thumbscrew
Cyclone body
Grit pot
Cyclone top
Tel: 724-941-9701 Fax: 724-941-1369 e-mail: skctech@skcinc.com
863 Valley View Road, Eighty Four, PA 15330 USA
GS-3 Multiple-inlet Cyclone
Cat. Nos. 225-100 and 225-103
Description
The GS-3 Cyclone is a 10-mm, lightweight, multiple-inlet, conductive plastic
sampler that uses a standard three-piece casse e and fi lter for the collection of respira-
ble dust particles. Designed to conform to ISO/CEN particle size-selection criteria (ISO
7708:1995), the GS-3 Cyclone has a 50% cut-point of 4.0 μm (with bias within ISO/OSHA/
NIOSH requirements) at 2.75 L/min* or a 3.5 μm at 3.7 L/min.
Cyclone meets the requirements in the OSHA proposed rule for silica.
The GS-3 Cyclone can be used with a 25 or 37-mm three-piece casse e with the
corresponding casse e adapter and fi lter.
Assembly (Figure 1)
The GS-3 Cyclone is supplied fully assembled
with bowl adapter and 37 or 25-mm casse e
adapter dependent upon model (Cat. Nos.
225-100 or 225-103, respectively). Replacement
casse e adapters are available, allowing the
user to adapt whichever model they are using
to another casse e size.
†
In addition, the GS-3
1. Disassemble a three-piece casse e and set
aside inlet section (usually marked “inlet”).
Keep inlet section for closing the casse e
a er sampling.
2. Select a fi lter and support pad as specifi ed
in the sampling method. Place support pad
into casse e outlet and place fi lter on top
of support pad. Insert casse e ring (middle)
section into casse e outlet. Ensure a fi rm
seal.
3. Hold cyclone upside down (casse e adapter
facing downward). Insert casse e adapter
into casse e middle ring section. Press until
a fi rm seal is established.
4. Ensure thumbscrew on cyclone is secure
and that the grit pot remains on the cyclone
body during sampling.
* Calibrated at U.K. Health and Safety Laboratories. Visit
www.skcinc.com/prod/225-100.asp to view the collection
effi ciency curve.
† Determined using experimental data obtained at fl ows
from 2.0 to 4.0 L/min.
Figure 1
GS-3 Cyclone with Filter
Cassette — Exploded View
Inserting Cyclone/Cassette Assembly in 225-1
Tygon tubing
Rubber tubing
Filter cassette
Filter cassette
holder
Grit pot
Collar clip
Luer adapter
GS cyclone
Spring-loaded
hold-down plate
Cassette outlet
Cassette Holder (Figure 2)
1. Insert the cyclone body through
the large opening of the casse e
holder.
2. Ensure the cyclone/casse e
assembly is seated fi rmly in the
holder by inserting the cyclone’s
small round nodule on the rim
into the notch in the casse e
holder.
3. Remove the plug from the
casse e outlet.
4. Secure the cyclone/casse e
assembly in the holder by
stretching the spring-loaded
hold-down plate over the
casse e outlet.
5. Insert the holder’s Luer adapter
(located on the end of the rubber
tubing) into the casse e outlet.
GS-3 Cyclone/Cassette Assembly
Figure 2
in Holder (Cat. No. 225-1)
Calibration
Option 1: Using a Calibration Jar (Figure 3)
1. Prepare a cyclone/casse e assembly (see Figure 1). Ensure grit pot remains
on cyclone body during calibration.
SKC recommends using the smallest calibration jar possible. To
achieve this, do NOT use Cassette Holder 225-1 during calibration.
2. Place cyclone/casse e assembly into an airtight calibration jar that contains an
inlet and outlet (SKC Cat. No. 225-111, see Figure 3).
3. Using fl exible tubing, connect inlet of calibrator to inlet of calibration jar.
4. Run tubing from outlet of cyclone/casse e assembly through outlet of
calibration jar and to the inlet of a sample pump. If using the SKC 225-111 jar,
connect the Luer adapter inside the jar to the cyclone/casse e outlet. Connect
jar outlet to inlet of a sample pump.
Inlet
Outlet
Calibrator
GS-3 Cyclone/cassette
assembly inside calibration jar
Multi-purpose
calibration jar
(225-111)
Inlet
Sample pump
Figure 3
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