New DEVEX air/gas sampling bags with PTFE dual-valve with silicone septum syringe sample NDV32_15L

• composed of total 11 layer films
• very low background,little contamination and good elasticity
• superb strength and low permeability
• excellent chemical inertness and stability
• wide range of applications
• low price and highly cost effective
• Devex film is glued of environmental protection adhesive, amount of organic volatile chemicals(VOCs)by inner layers is extremely low, thereby avoid the sample gas being polluted and prevent the interference of analysis data. The organic solvent remnant amount of Devex film is 0.1mg~0.3mg/㎡, so Devex film is the ideal high performance substitute for Aluminium-foil multi-layer film.

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 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 clean up.