Development of portable gas sensing system for measuring gas emission concentration and diffusivity using commercial manometric sensors in gas exposed polymers: Application to pure gases, H2, He, N2, O2 and Ar
Jae Kap Jung, Ji Hun Lee, Ye Won Kim, Nak-Kwan Chung
Abstract
Low-cost gas sensing system to measure the emission concentration and diffusion coefficient of the gas emitted from specimens, which were exposed by gas under high pressure, was developed using the commercial manometric sensors. The gas emitted from two polymer specimens [low density polyethylene (LDPE) and nitrile butadiene rubber (NBR)] during desorption produced a measurable increase in pressure; this pressure was recorded by a portable data logger in the specimen container chamber. Thus, the molar concentration and diffusivity of the released gas were calculated via the ideal gas equation and diffusion analysis program. As results, gas sensor immediately responded without any chemical interaction and emitted gas weight per specimen weight up to 1400×10−6 with a controllable sensitivity/resolution. The performance test confirmed that our developed sensing technique had good reliability, adjustable measurable range and independence to fluctuations in temperature and pressure. Consequently, the developed simple sensing system was successfully used for the simultaneous real-time detection and transport characterizations for pure gases (H2, He, N2, O2 and Ar).