Vac-U-Chamber Cat. Nos. 231-939 and 231-940
2380 East Walnut Ave., Fullerton, CA 92834 USA
Tel: 714-992-2780 Fax: 714-870-9634
e-mail: [email protected]
Vac-U-Chamber
Cat. Nos. 231-939 and 231-940
Operating Instructions
Introduction
Vac-U-Chamber is suitable for the following applications:
• U.S. EPA Methods 18 (VOCs—industrial sources) and 0040
(POHCs—stationary sources)
• Soil/gas vapor sampling (U.S. EPA SOP 2042, ASTM D5314-92)
• Indoor air remediation system monitoring petroleum constituents
(U.S. EPA SOPs 2102, 2103, and 2104)
• Groundwater testing
• Stack sampling
• Ventilation studies
• Hazmat testing
• Preparation of standards/gas mixes
Description
The Vac-U-Chamber is a rigid, airtight case with connector fittings on three ports:
1. Vacuum port—to inflate the sample bag
2. Purge port—to evacuate the sample bag before sampling, to sample, and to make
a standard
3. Sample inlet port—1/4-inch OD fitting to connect the sample line or gas source
The Small Vac-U-Chamber has the vacuum and sample inlet ports on the front and
the purge port on the side; the Large Vac-U-Chamber has all three ports on the front
(Figure 1). Note: Designed to contain SKC sample bags.
Window
Purge port on side of
small model
Sample inlet
Vacuum port
Purge port
Sample inlet port
Figure 1. Large Vac-U-Chamber and Ports
Vac-U-Chamber Contents
If You Have Cat. No. Your Package Should Contain
Small Vac-U-Chamber with polypropylene fittings (supplied
231-940
without pump) and ¼-inch ID Tygon tubing with polypropylene
quick coupling; suitable for use with SKC 1-liter sample bags
Large Vac-U-Chamber with stainless steel fittings (supplied
231-939
without pump) and ¼-inch ID Tygon tubing with stainless steel
quick coupling; suitable for use with SKC 8-liter bags
See Accessories/Replacement Parts on page 7.
Required Equipment

Sample pump such as the SKC Universal XR Series, AirChek® TOUCH, or
AirChek XR5000


¼-inch ID (5/16-inch OD) PTFE tubing for sample line
Sample bags: 1 liter for use with Small Vac-U-Chamber, 8 liter for use
with Large Vac-U-Chamber; see options below
Bag Material
Tedlar®
SamplePro® FlexFilm
Standard FlexFoil®
FlexFoil PLUS
1 Liter Cat. No.
232-01
236-001
262-01
252-01
2
8 Liter Cat. No.
232-939
236-004
262-08
252-08
Operation
Set/Calibrate Pump Flow Rate
• If using a Universal XR Series sample pump, ensure that it is in high flow mode.
See pump operating instructions.
• Before sampling, allow pump to equilibrate after moving it from one temperature
extreme to another.
Set the pump for a flow rate sufficient to sample in the required time. See Timed
Sampling and pump operating instructions for details on setting flow.
Calibrate pump flow rate if required by the method used.
1.
Run the pump for 5 minutes before calibrating.
2.
Use flexible tubing to connect the pump inlet to the outlet (suction) port of a
calibrator.
3.
Calibrate the pump to the flow rate specified in the method used. See pump and
calibrator operating instructions for details.
Install Sample Bag in Vac-U-Chamber
1.
Inside the Vac-U-Chamber, insert the inlet stem of the sample bag into the
chamber’s sample inlet (short piece of PTFE tubing, see below).
Sample inlet inside
Vac-U-Chamber
Sample inlet
2.
Open the valve on the bag by turning the entire
upper portion (septum body and cap) of the fitting
counterclockwise one revolution.
Do not turn the side stem.

Fill Sample Bag with a Sample (Grab or Timed)
Setup
1. Install the sample bag properly. See Install Sample Bag in Vac-U-Chamber.
2.
Purge the sample bag and/or sample line if required. See Purge Sample Bag/
Sample Line.
3
3.
Outside the Vac-U-Chamber, push the quick
coupling on the end of the supplied Tygon
tubing into the vacuum port; see right. Press
the open end of the Tygon tubing securely
onto the pump inlet. Note: Ensure that the red
cap plug is removed from the sample inlet port.
4.
Close the Vac-U-Chamber and secure both latches. Perform grab or timed
sampling. See below.
Grab Sampling
1. Turn on the pump and monitor bag inflation through the window in the
chamber’s lid. Run the pump until the bag is approximately 80% full. Do not
overinflate the bag (Figure 2).
2.
Turn off the pump when sampling is complete. Immediately open the Vac-UChamber. Note: Disconnect the pump to release the vacuum.
3.
Close the valve on the sample bag by turning the entire upper portion (septum
body and cap) of the fitting clockwise one revolution.
4.
Pull the bag fitting from the chamber’s sample inlet (short piece of PTFE tubing).
Timed Sampling
The Vac-U-Chamber is not a perfect vacuum, but its leak rate is low and allows
efficient sample collection, even at lower flow rates (10 ml/min), for a full 8-hour
sample. To collect 1 liter of sample into a 1-liter bag, use a vacuum source at
approximately 1 L/min for 1 minute. Use similar flows to determine filling times.
1.
Set/Calibrate the pump flow rate to collect enough sample in the time required
in the analytical method.
2.
Turn on the pump and record the start time. Sample for the time specified in
the analytical method. Do not overinflate the bag (Figure 2).
3.
Turn off the pump, record the stop time, and immediately open the Vac-UChamber. Note: Disconnect the pump to release the vacuum.
4.
Close the valve on the sample bag by turning the entire upper portion (septum
body and cap) of the fitting clockwise one revolution.
5.
Pull the bag fitting from the chamber’s sample inlet (short piece of PTFE tubing).
Purge Sample Bag/Sample Line
Purge Sample Bag
1. Ensure that the sample bag is installed properly inside the Vac-U-Chamber.
See Install Sample Bag in Vac-U-Chamber.
2.
Outside the Vac-U-Chamber, connect a source of 99.99% nitrogen OR purified
air to the sample inlet port (¼-inch OD fitting). If desired, insert a charcoal filter
between the cylinder and the bag.
3.
Push the quick coupling on the end of the supplied Tygon tubing into the purge
port (Figure 1), and press the open end of the Tygon tubing securely onto the
pump inlet.
4
4.
Turn on the sample pump and run it until the bag is completely deflated. Note:
If the sample pump used has a flow fault feature, the pump may go into flow fault during
this operation. If the pump does not reset automatically, see the flow fault section in
the pump operating instructions.
Direct the vented air to a safe location. Do NOT breathe the exhaust air from the
bag being purged.
5.
Turn off the pump and use the quick coupling to detach the Tygon tubing from
the purge port as follows, depending on the model. See below.
On the Large Vac-U-Chamber,
grip the release ring and push
toward the chamber.
6.
On the Small Vac-U-Chamber,
press down on the release tab.
Open the valve on the regulator. Nitrogen will flow into the bag at approximately
500 ml/min. Fill a 1-liter bag for approximately 2 minutes or an 8-liter bag for
approximately 16 minutes.
Use the window in the lid of the chamber to monitor bag inflation. Do not fill the
bag more than 80% of its maximum volume (Figure 2).
7.
Close the valve on the regulator.
8.
Evacuate the sample bag: with the red cap on the sample inlet port, push the
quick coupling on the end of the supplied Tygon tubing into the purge port
(Figure 1) and press the open end of the tubing securely on the pump inlet.
Turn on the sample pump and run it until the bag is completely deflated.
9.
Repeat Steps 3 through 8 at least two more times before sampling. After purging
the sample bag, purge the sample line if desired. See Purge Sample Line.
Incorrect inflation
Correct inflation
Figure 2. Bag Inflation
5
Purge Sample Line
1. Remove the red cap from the sample inlet port (Figure 1). Press a long length
of PTFE tubing (the sample line) onto the sample inlet port. Connect the loose
end of the PTFE tubing to a clean air source.
2.
Align and push the quick coupling on the end of the supplied Tygon tubing
into the purge port (Figure 1). Press the open end of the Tygon tubing securely
onto the pump inlet.
3. Turn on the pump and let it run long enough to purge the line. Repeat the
process as many times as desired.
4.
Turn off the pump and use the quick coupling to detach the Tygon tubing from
the purge port.
How to Handle Sample Bags Post-sampling
• Keep bags containing samples out of direct sunlight.
• If a sample bag was partially evacuated onto an instrument (gas chromatography) or
into a color detector tube, evacuate the remaining sample before disposing of the bag.
See Purge Sample Bag, Step 8.
• Direct the vented air to a safe location. Do NOT breathe the exhaust air from the bag
being evacuated.
• Pack sample bags loosely and with padding to minimize possible puncturing during
shipment.
• Do not ship sample bags by air unless the cargo cabin is pressurized; a significant
decrease in barometric pressure may cause sample bags to burst.
Special Application
Make Standard Gas Samples
1.
To use your Vac-U-Chamber to make a standard, connect a source of 99.99% nitrogen OR purified air to the sample inlet port (Figure 1).
2.
Meter into the sample bag an exact amount of nitrogen or air sample.
One liter of nitrogen or air is admitted into the bag by flowing 500 ml/min for
120 seconds.
3.
Close the valve on the sample bag and remove the bag from the chamber.
4.
Inject the proper amount of chemical through the septum fitting. For example,
to make a standard of 1 part per million of vinyl chloride, inject 1 microliter of
vinyl chloride through the septum into a bag containing 1 liter of nitrogen.
5.
Knead the bag to mix.
6
Accessories/Replacement Parts
Description
PTFE Tubing, ¼-inch ID (5/16-inch OD), for sample line
50 feet
10 feet
Nitrogen Cylinder, 103 liters, 99.99% pure, requires regulator
Regulator for cylinder, 500 ml/min, requires cylinder
Charcoal Tubes, pk/50
Telescoping Sample Probe, stainless steel
16 inches to 6 feet 5 inches
14.5 inches to 4 feet 5 inches
Digital Stopwatch
Accessories/Replacement Parts
Quick Coupling Male Insert, stainless steel, connected to 3 feet of Tygon tubing,
for Large Vac-U-Chamber
Quick Coupling Male Insert, polypropylene, connected to 3 feet of Tygon tubing,
for Small Vac-U-Chamber
Quick Coupling Female Connector, polypropylene, for Small Vac-U-Chamber
Quick Coupling Female Connector, stainless steel, for Large Vac-U-Chamber
Sample Bags
Tedlar Bags with Dual Stainless Steel Fitting
1 Liter
Tedlar Bags with Single Polypropylene Fitting
1 Liter
8 Liter
Standard FlexFoil with Single Polypropylene Fitting
1 Liter
8 Liter
FlexFoil PLUS with Single Polypropylene Fitting
1 Liter
8 Liter
SamplePRO FlexFilm with Single Polypropylene Fitting
1 Liter
8 Liter
Replacement Septa
Septa for Dual Stainless Steel Fittings
Septa for Single Polypropylene Fittings
Cat. No.
231-924
231-937
804-9B0994
804-R713050
226-09
805-10545
805-10546
303-01-1
P231941
P231941M
P231942
P231943
231-01
232-01
232-939
262-01
262-08
252-01
252-08
236-001
236-004
231-9-04
232-01-RS
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 http://www.skcinc.com/warranty.asp.
7
Appendix
Performance Profile
Sampling Media:
1 or 8-liter bag
Sampling Rate:
User selectable
Sample Time:Varies
Do not fill bag more than 80% of its maximum volume
Sample Pump:
AirChek TOUCH, AirChek XR5000, or Universal XR —
1 to 5 L/min
Analysis:Varies
Publication 1904 Rev 1509
8
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