Vac-U-Tube Operating Instructions

Vac-U-Tube Operating Instructions
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 Fax: 724-941-1369 e-mail: [email protected]
Cat. No. 231-945
The Vac-U-Tube fills a 0.7-liter sample bag without the use of an electronic pump and
can be used for headspace and soil gas sampling and for testing monitoring wells.
The Vac-U-Tube is an acrylic tube with plunger and removable front lid and
functions as a syringe (Figure 1). A specially designed sample bag (SKC Cat. No.
232-945A) is inserted inside the tube for collection of an air sample. The sample bag
is precisely sized to fit exactly inside the Vac-U-Tube and allow for proper inflation.
Fully inflated, the bag holds 0.7 liter.
The movable bar on the front of the Vac-U-Tube locks the front lid in place to ensure
a proper seal during operation (Figure 2).
inlet cap
Acrylic tube
Front lid
Movable bar
Control handle
Center metal band
Figure 1. Vac-U-Tube
Figure 2. Vac-U-Tube with front lid locked in place
Checking Pump/Kit Contents
Use the table below to verify that you received all items associated with the Cat.
No. ordered. If you are missing items, contact SKC at 800-752-8472 (U.S. only) or
If You Have Cat. No.
Your Package Should Contain
Vac-U-Tube hand pump with strap and carry case
Required Equipment/Media
Tedlar sample bag, 0.7 liter, single polypropylene fitting (Cat. No. 232-945A)
Insert the Bag (Figure 3)
Insert the sample bag valve side stem into the short piece of PTFE tubing on
the inside of the Vac-U-Tube front lid.
Note: Before inserting the bag into the tube, ensure that the plunger has been positioned to
a point halfway down the tube (the center metal band is a good mark).
With the valve side stem inserted into the PTFE tubing on the inside of the
front lid, open the bag valve by turning the entire upper portion of the valve
fitting (including the brown or white septum cap and the white septum body)
counterclockwise one revolution.
Insert the bag into the Vac-U-Tube. The bag should have a slight bend along
its length to allow proper inflation.
With the bag inserted into the Vac-U-Tube and the front lid in place, move the
front bar up over the knob to seal the tube (Figure 4).
Figure 3. Inserting the sample bag
Fill the Bag
Before sampling, flush the sample bag throughly with the cleanest air available
at least 3 times.
When ready to take a sample, remove the red cap from the inlet on the outside
of the front lid.
With one hand, hold the control handle and with the other, pull the T-handle on
the top of the Vac-U-Tube to inflate the bag (Figure 4). Monitor the inflation of the
bag (see sample bag operating instructions 3781 for correct inflation) and stop when
sufficient sample is taken.
Sample bags are designed for single use only.
Figure 4. Filling the sample bag
Note: A technique for taking the sample is to rotate the Vac-U-Tube about 90 degrees with
the control handle in front, resting the back corner of the tube on the hip and pulling the
T-handle. This allows for a better position while taking a sample.
Remove the Bag
After taking the sample, replace the red cap on the inlet on the front lid and
swing the front bar down while holding the lid.
Remove the lid; close the sample bag valve by turning the entire upper portion
of the fitting (including the brown or white septum cap and the white septum
body) clockwise and disconnect the bag. Record any pertinent sampling
How to Handle Sample Bags after Sampling
It is important to handle sample bags after sampling as follows:
• Keep sample bags out of direct sunlight.
• Do not use sample bags to collect unstable or highly reactive compounds.
• Pack sample bags loosely and with padding to minimize possible puncturing during
• 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.
Lubricate the O-rings periodically with silicone lubricant:
Remove the O-ring from the front lid and apply lubricant.
For the plunger O-ring, pull the plunger to the back of the Vac-U-Tube, wipe
the interior with a moist cloth, and apply lubricant to the inner circumference
near the plunger. The plunger can then be pushed in and out 3 to 4 times to
distribute the lubricant on the O-ring and along the inside of the tube.
Note: Fluoropolymer/silicone spray lubricant can be used (either aerosol or liquid spray).
Check the knurled knobs holding the front bar occasionally to ensure correct
tightness. The bracket that holds the front bar may require an occasional adjustment
by loosening and repositioning the screw with the lid on to maintain the correct
tension on the lid.
Accessories/Replacement Parts
Replacement Lid Gasket
Replacement Lid
Vac-U-Tube Sample Bags
Cat. No.
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
Form 37101 Rev 1507
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