SKC 231, 237, 248 User Manual

Operating Instructions

Tel: [phone] Fax: [phone] e-mail: [e-mail]

863 Valley View Road, Eighty Four, PA 15330 USA

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 PTFE-lined 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.

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.

Failure to follow warnings and cautions voids any warranty.

Sample bags are designed for single use only.

®

FlexFilm bag material

®

000277

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 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 screw
until snug to lock the valve closed.

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.

Do not allow the syringe needle to puncture the bag
material when piercing the septum.

2

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 screw to lock the valve closed.

Incorrect

Infl ation

Correct

Infl ation

SKC sample bags are available in Tedlar®, FluoroFilm FEP, SamplePro FlexFilm, FlexFoil®
PLUS, and Standard FlexFoil with fi ttings made of stainless steel, polypropylene, or PTFE
in sizes ranging from 10 milliliters to 100 liters. SKC also manufactures custom sample
bags. Contact SKC at 724-941-9701 or [e-mail].

3

Accessories

Replacement Septa, pk/10.......................................................................Cat. No. 231-9-04

PTFE Tubing, fi ts over bag fi tting and Grab Air Sample Pump

fi ttings, 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 inlet and 222 Pump fi ttings,

1/4-inch ID, 5/16-inch OD ..........................................................10 feet .....Cat. No. 231-937

50 feet .....Cat. No. 231-924

Twin Port Pocket Pump Tubing Adapter Kit includes two
lengths of silicone tubing: 1/8-inch ID, 1/4-inch OD for bag
fi tting and 3/16-inch ID, 3/8-inch OD for pump fi tting; use with

Cat. No. 231-9-23 PTFE tubing (above) ....................................................Cat. No. 231-926

For more product information or assistance with applications,

contact the SKC Technical Service Department at [e-mail].

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 1402