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
5. Turn on pump and calibrate to desired fl ow rate following directions in the
pump and calibrator operating instructions.
Flow rate: 2.75 L/min for a 4.0-μm cut-point
3.7 L/min for a 3.5-μm cut-point
*
†
6. A er calibration, disassemble calibration jar, remove cyclone/casse e
assembly, and replace casse e used for calibration with a fresh (unused)
casse e to be used for sampling.
Option 2: Jarless Calibration (Figure 4)
This calibration option is recommended
when using a Defender primary standard
calibrator to calibrate personal air sample
pumps for size-selective particulate
sampling using particulate samplers that
do not have their own calibration adapters.
1. Use a length of fl exible tubing to
a ach the inlet of the sample
pump to the suction port of a
Defender calibrator.
Figure 4. Jarless Calibration with Cyclone/Cassette
Assembly and AirChek XR5000 Pump
2. Use the shortest length of tubing possible to a ach the outlet of the casse e in
a cyclone/casse e assembly to the pressure port of the Defender.
3. Set the Defender to take at least 20 fl ow measurements in order to average out
the fl ow variations caused by direct connection of the pump to the calibrator.
See calibrator operating instructions for details.
Sampling
1. Ensure the fl ow rate has been set properly (see Calibration).
Leave grit pot in place during calibration and sampling.
2. Ensure fresh casse e has been installed on the cyclone and the cyclone/casse e
assembly has been inserted into the casse e holder (see holder instructions).
3. Connect the Tygon
®
tubing attached to the cassette holder to the inlet of a
constant fl ow personal sampling pump.
4. Clip the holder with the cyclone/casse e assembly onto a worker’s collar or
pocket as close to the breathing zone as possible.
5. Clip the pump onto the worker’s belt or place it in a protective pouch. Start the
pump and record pertinent details.
6. At the end of the sampling period, stop the pump and record pertinent details.
Remove the cyclone/casse e assembly from the casse e holder. Immediately
separate the cyclone from the casse e. Replace the inlet section of the casse e,
seal the inlet and outlet sections with the provided plugs, and send the casse e
and all data to a laboratory for analysis.
Particles collected in the grit pot do not represent any part of the
respirable dust sample and should be discarded.
* 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.
Cleaning
A er sampling, clean all parts of the cyclone, including the interior of the grit
pot, with mild soapy water. The cyclone can be wiped with a clean dust-free tissue, air dried, blown dry, or wiped with isopropyl alcohol.
Do not use strong solvents to clean the GS-3 Cyclone.
References
Gautam, M. and Sreenath, A., “Performance of a Respirable Multi-Inlet Cyclone Sampler”, J.
Aerosol Sci., Vol. 28. No. 7, pp. 1265-1281, 1997 (copy available from SKC)
Trakumas, S., et. al., Performance Assessment of Personal Respirable Cyclone Samplers, AIHce
Presentation 191, 2003
Ordering Information
Description Cat. No.
GS-3 Cyclone with Cassette Adapter
25 mm
37 mm
Replacement Cassette Adapter
25 mm
37 mm
225-103
225-100
225-101
225-102
Replacement Bowl Adapter 225-108
Replacement Grit Pots, pk/25 P225012
Filter Cassette/Cyclone Holder for standard 25 or 37-mm
3-piece cassettes with or without a cyclone 225-1
Standard-size Multi-purpose Calibration Jar 225-111
SKC Limited Warranty and Return Policy
SKC products are subject to the SKC Limited Warranty and Return Policy, which
provides SKC’s sole liability and the buyer’s exclusive remedy. To view the complete SKC Limited Warranty and Return Policy, go to h p://www.skcinc.com/
warranty.asp.
Form 37097 Rev 1401
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