25203 Garrett Highway | McHenry, MD 21541 | Phone: 301-387-3400 | Fax: 301-387-3631 | Email: gsb@calibrated.com

Pressure & Temperature

Gas sampling bag inflation pressures need not exceed 7.0" WG (17.4 mbar, 0.25 psi).

  • Bags Should Not Be Over Inflated - When filled, they should not appear "tight". Over-inflation may lead to premature bag failure. When bag samples are air transported, ample provision should be made for gas expansion at higher flight altitudes. Users should consult US Department of Transportation (DOT) Code of Federal Regulations (CFR 49) and the International Air Transport Association (IATA) regulations which must be followed for the shipment of flammable and toxic gas(es) in gas sampling bags.

  • Bags should not be used at temperatures higher than 125 - 130 °F (50 - 55 °C) - All polymer based gas sampling bags should be handled with extra care when used at constant gas volume temperatures above ambient, particularly above 110 - 115 °F (40 - 45 °C).

Consult our Technical Service Department before undertaking any "bake-out" preparation of the bags as part of an established sampling protocol.

If high temperature stack gases are to be collected, sample line tubing should be long enough to allow the sampled gas stream to cool before entering the bag. Depending upon final sample analysis requirements, it may be necessary to collect any condensed vapor in the sampling line; or to "dry out" the wet sample gas flow into the bag.