DEVEX Gas Sampling Bag
DEVEX gas sampling bags are developed by adopting international advanced film-making technology specifically for making high quality gas.
*composed of total 11 layer films
*superb strength and low permeability
*excellent chemical inertness and stability *wide range of applications
* low price
Standard Devex Gas Sampling Bag Sizes:0.5L,1L,2L,3L,4L,5L,8L,10L,15L,20L,30L,and 40L or customized size.
Note: if you need any products, please kindly contact with us directly by email,not leave message here. Then we can get your email soon and reply you .
thanks for your understanding !
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 ABS.
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 to fill.
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 VOCs assessment.