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Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 • www.skcinc.com
Dual Stainless Steel Fitted Bags
231 and 237 Series Sample Bags
The 231 and 237 Series sample bags feature dual stainless steel fi ings – an inlet
valve for fl ushing and fi lling and a septum fi ing for removing samples.
Guidelines for Bag Sampling
1. Ensure that the bag material and fi ings are appropriate for the compounds
to be sampled.
2. Use only PTFE tubing to connect the sample bag to the pump to prevent sample
loss by adsorption on tubing walls.
3. Before using, fl ush the bag thoroughly with purifi ed air or nitrogen.
4. Analyze the sample within 24 to 48 hours. Long-term storage of air-contaminant
mixtures in bags is not recommended.
5. Do not ship sample bags by air unless the cargo cabin is pressurized.
Notes and Cautions
• Maximum Operating Temperature — Do not exceed these specifi cations:
• 231 Series Bags: 225 F (107 C) due to fi ing O-ring temperature rating
• 237 Series Bags: 140 F (60 C) due to the SamplePro
temperature rating
• Do not use sample bags to sample compounds with boiling points > 249.8 F (121 C).
• SKC sample bags are designed for sampling air at atmospheric pressure only. A empting
to pressurize the bag can result in bag rupture and sample loss. Do not ship bag samples
by air freight in a non-pressurized cargo cabin. Bags can burst under such conditions.
• All federal and state packaging and transporting regulations apply.
• SKC bag fi ing valves are extremely durable but are not intended for use as handles or
hanging devices. This type of handling may damage the seal, causing leakage. This is
considered to be misuse and will void the SKC warranty.
• Failure to follow warnings and cautions voids any warranty.
• Sample bags are designed for single use only.
®
FlexFilm bag material
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Operation
1. Flush the bag at least 3 times with purifi ed
air or nitrogen before use.
2. To fi ll the bag, connect PTFE tubing from the
exhaust port of an air sample pump to the
hose connection on the bag (stem protruding
from the top of the inlet fi ing).
3. Ensure that the valve is locked open by tightening the
knurled thumbscrew clockwise until snug. Turn on the
sample pump to fi ll the bag (see Proper Bag Infl ation).
Do not sample compounds that exceed the 225 F (107.2 C)
temperature rating of the fi ing O-rings.
When using 237 Series SamplePro FlexFilm bags, do not
sample compounds that exceed 140 F (60 C) temperature.
Do not use sample bags to sample compounds with
boiling points > 249.8 F (121 C).
4. When sampling is complete, turn off the pump and
loosen (turn counterclockwise) the knurled thumbscrew a
maximum of 2 revolutions.
5. Close the shut-off valve by pulling up on the valve stem.
(Note: Ensure the PTFE tubing is not pulled off while
pulling up on the valve stem.) Tighten the knurled
thumbscrew until snug to lock the valve closed.
The outside diameter of the syringe needle should not be
larger than 22 gauge (0.028 inch).
Do not allow the syringe needle to puncture the bag
material when piercing the septum.
6. To withdraw samples using a needle and syringe,
carefully insert the needle into the port in the septum
fi ing and pierce the septum.
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Proper Bag Infl ation
Avoid fi lling any bag more than 80% of its maximum volume. At the end of the
sampling period, turn the pump off and close the valve on the bag. Tighten the
knurled thumbscrew to lock the valve closed.
Incorrect
Infl ation
Correct
Infl ation
SKC sample bags are available in Tedlar®, FlexFoil® PLUS, and Standard FlexFoil with
fi ttings made of stainless steel, polypropylene, or PTFE in sizes ranging from 0.5 to
100 liters. SKC also manufactures custom sample bags. Contact SKC at 724-941-9701
or skcorder@skcinc.com.
For sample bag stability reports, visit
http://www.skcinc.com/catalog/pdf/instructions/1805.pdf.
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Accessories
Replacement Septa, pk/10.......................................................................Cat. No. 231-9-04
PTFE Tubing, fi ts over bag fi tting and pump exhaust,
3/16-inch ID, 1/4-inch OD ..........................................................10 feet .....Cat. No. 231-9-23
PTFE Tubing, fi ts inside bag fi tting,
1/16-inch ID, 1/8-inch OD ..........................................................10 feet .....Cat. No. 231-9-21
PTFE Tubing, fi ts Vac-U-Chamber sample inlet port,
1/4-inch ID, 5/16-inch OD ..........................................................10 feet .....Cat. No. 231-937
50 feet .....Cat. No. 231-924
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.
www.skcinc.com
Form 3714 Rev 1706
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