DEVEX Gas Sampling Bag
DEVEX gas sampling bags are developed by adopting international
advanced film-making technology specifically for making high
*composed of total 11 layer films
*superb strength and low permeability
*excellent chemical inertness and stability *wide range of
* low price
Standard Devex Gas Sampling Bag
Sizes:0.5L,1L,2L,3L,4L,5L,8L,10L,15L,20L,30L,and 40L or customized
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Plastic Straight Valve
Plastic valve is made of ABS with 5mm outer diameter shaft as
connector. Plastic valve has on/off function. When turn shaft
clockwise, it moves down; the valve is closed; when shaft moves up,
the valve is open. It can handle gases that are not corrosive to
Plastic valve with side connector
It is made of ABS with 6mm outer diameter connector. When turn cap
counter-clockwise, the valve is open; when turn cap clockwise, the
valve is closed. Do not overtight the cap to prevent damage of
valve. Just finger tight. The cap comes with septum that can be
used to withdraw with a syringe. It can handle gases that are not
corrosive to ABS.
Stopcock straight valve
It's made of medical grade polycarbonate (PC) with 6mm connector.
Valve stem (connector) is vertical to the surface of film. The
valve utilizes patented technology. The valve body and cock are
modeled and polished so that the valve does not need lubricant and
sealing part, the crosscontamination is eliminated.The valve not
only has on/off function but also can control flow rate. When turn
handle toward the connector, the valve is open. The valve is closed
when the handle is turned vertically to the connector. The crewed
connector has cap with silicone septum in it, which is convenient
for sampling. Since the valve does not introduce any potential
contamination, it can be used for VOC analysis.
Side-opening stopcock valve
It has similar functions to the stopcock valve . The difference is
the connector it horizontal to the surface of bag. The sampling cap
is opposite to the connector. This patented design is convenient
for filling and sampling gas.
Metal valve is made of nickel-plated copper alloy with 5mm
connector. The connector not only uses to fill or release gas
sample but also is shut-off valve. When turn the connector
counterclockwise, it moves up, the valve is open; the valve is
closed when it moves down. The connector should move up rapidly to
prevent leaking since the distance of movement is very short. The
metal valve can be used in collecting or storing non-corrosive
inorganic and organic gases.
Metal fitting is made of nickel-coated copper alloy with 7mm outer
diameter. The cap comes with a silicone septum for easy sampling
with a needle. Remove the cap when perform filling gas sample or
flushing the bag. The metal can be used in the circumstance that
there is no corrosive inorganic gases or organic gases.
pe1.Avoid filling pressure higher than 6000Pa. Fill gas until the
bag is fully expanded, however, it is not so tense when you press
it using your finger.
2.Keep away from flame and high temperature when filling and
storage. Avoid contacting sharp stuff.
3.Before use, flush sampling bags three times with the gas you want
When using a needle to draw gas from highly elastic septum, squeeze
the septum with fingers in order to restore the sealing property
after pulling out the needle.
Working temperatures should be -15°C to +60°C .rating
Instructions for DEVEX bag
DEVEX film is developed specifically for making high quality gas
sampling bags. It is composed of total 11 layer films (PET, PA,
Aluminum, PE, etc) with thickness 120-140um.It has superb strength
and low permeability; meanwhile it possesses excellent chemical
inertness and stability. The overall property of DEVEX film exceeds
that of PVDC film such as Saran. During lamination,
environmental-friendly adhesive is used to eliminate solvent
residue such as benzene, acetone, and esters. DEVEX gas sampling
bags have a wide range of applications including hydrocarbons,
CO,CO2, nitrogen, hydrogen, oxygen, hydrogen sulfide, nitrogen
oxides and halogens. But it is not recommended to use for hydrogen
sulfide, nitrogen oxides and halogens at ppb level. Compared to
Polyfluoro film bags, DEVEX bags have low price, and can be used in