Devex—ABS straight On/Off dual-valve (DEV12)                   

                                      Devex—ABS straight On/Off valve+fitting(DEV13Z)

 (There is no silicone pad on the back of bag with fitting because the fitting with silicone septum also can be syringe sampling)

      DEVEX gas sampling bag compared to Aluminium-plastic(multi-layer)gas sampling bag is higher performance replacement. DEVEX film is developed by Dalian HedeTechnologies Corporation specifically for making high quality gas samplingbags. It is composed of total 11 layer films (PET, PA, Aluminum, PE, etc) withthickness 120-140um.

•Standard Devex(multi-layer) Gas Sampling Bag Sizes:0.5L,1L,2L,3L,4L,5L,8L,10L,15L,20L,30L, 40L～6000L or customized size.

Applicable scope:

• Devex gas sampling bags 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 bags can ensure that the low concentration(PPM)component is constant for 1-3 months.
• Devex gas sampling bags can fill low level of hydrogen(H2),oxyen(O2),nitrogen(N2),argon(Ar),methane(CH4),carbonic oxide(CO), carbon 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 at low ppb level.
• Devex gas sampling bags apply to lucifuge sampling for Photosensitive gas.

Operating guide & Precautions:

• 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 to fill.

• 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 composition,it can volatilize benzene, ketones, ethers, esters and other organic matter,So we should pay attention to the Aluminium-plastic composite membrane separating out the residual organic matter can pollute the sampling 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 deposition

• 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 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 clean.