China manufacturer DEVEX air/gas sample bags with stopcock &
septum valve for syringe DEV11C_1L sampling of exhaled air
Devex gas sampling bag compared to Aluminium-foil(multi-layer)gas
sampling bag is higher performance replacement. Devex film is
developed by Dalian Hede Technologies Corporation 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.
Ideal for sampling and storing H2S, and for low molecular weight
compounds such as Methane, CO/CO2, Hydrogen, and inert gases which
are not stable in Tedlar, Kynar, or FEP. Water- and vapour-proof,
these flexible bags protect light sensitive compounds. Bags are
available with several fitting and valve options. They provide up
to five day sample stability with minimal absorption.
- composed of total 11 layer films
- superb strength and low permeability and high barrier property and
low VOCs precipitated amount
- excellent chemical inertness and stability
- low price and wide range of applications
- Standard DEVEX Gas Sampling Bag
Sizes:0.5L,1L,2L,3L,4L,5L,8L,10L,15L,20L,30L,and 40L～6000L or
Select from a variety of sizes to suit your needs.
|Product Type||Sampling Bag|
- Devex gas sampling bag can fill the gas being of stable chemical
properties, such as: pyrolysis gas, natural gas, coal bed gas,
smoke dust gas, ambient atmosphere, technological process reaction
gas. It is widely used in petrochemical industry and environmental
monitor etc. for gas sampling and save. Devex gas sampling bag can
ensure that the low concentration (PPM) component is constant for
- Devex gas sampling bag can be used in sampling and detection for
- Devex gas sampling bag can fill low level of hydrogen(H2), oxyen(O2), nitrogen(N2),
argon(Ar), methane(CH4), carbonic oxide(CO), carbonic dioxide(CO2).
- Devex gas sampling bag is not recommended to use for the gas with
high chemical, corrosivity and strong oxidizing property such as:
hydrogen sulfide, nitrogen oxides, strong basicity gas and halogens gas or low content component ppb level.
- Devex gas sampling bag apply to lucifuge sampling for
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- 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.The overpressure filling can cause gas sampling
bag burst damage.
- Operating temperature: －15℃～＋60℃.
- Keep away from flame and high temperature when filling and storage.
Avoid contacting sharp stuff.
- Before use, flush sampling bags three times with the gas you want
- The connection of valve and instrument or the equipment best be
adopted correspongding latex tube or silicone tube transition.
- For sulphide and halogen gas,high content such as the percentage
level or low content such as PPM level are not recommended to use.
- As the composite membrane using two-component adhesive when
manufacturing,it can volatilize benzene,ketones,ethers,esters and
other organics,So we should pay attention to the Aluminium-foil
composite membrane separating out the residual organics can pollute
the sample gas inside the bag,analysis data can cause interference.
- The gas sampling bag should be cleaned repeatedly replacement if it
is reused. Suggest the same sample bag collecting samples of the
same kind gas, don't mix.
- The sample gas in sampling bag to save time should not be too
long,specific saving time depend on detection limit of experimental
analysis requirement,gas component species, temperature and
humidity,pressure,etc;generally,for pure inert gas,sampling bag can
be used as a temporary storage container and recommended storage
time less than 72 hours; for standard gas,flue gas,ambient
atmosphere,recommended storage time less than 24 hours.
- High purity nitrogen gas heating replacement can reduce the
interference of organic separating out.
- When sampling and cleaning,please do not exceed 80% of the
calibration volume,take 1L sampling bag for example,suggest
sampling volume is less than 0.8 L.
- There must be a blank sample bag compare for precise experimental
analysis to do background deduction.
- For high-temperature high-pressure gas should be down to normal
temperature and pressure to sample,specific treatment method
according to actual situation.
- For negative pressure gas, should be sampled by appropriate power
and flow rate vacuum pump.
- For the gas containing particulate matter,dust and aerosols,should
adopt filter to prevent polluting the sample bag,then difficult to
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