Gas sensors are crucial devices in various fields including industrial safety, environmental monitoring, gas infrastructure and medical diagnosis. These sensors measure specific gases in different environments, guaranteeing operational safety and efficiency through precise on-site measurements. Designed for high sensitivity, stability and reliability, gas sensors must also be cost-effective, quickly responsive and compact. To address these diverse requirements, we have developed two types of gas sensors based on the volumetric and the manometric method. These sensors operate by measuring the gas volume and the pressure changes, respectively, of the emitted gas. These sensors are capable of determining gas transport parameters such as gas uptake, solubility and diffusion coefficient for gas-charged polymers in high pressure environment. The sensors provide rapid responses within one second and can measure gas concentrations ranging from 0.01 wt ppm to 1500 wt ppm with adjustable sensitivity and measurement ranges. Performance evaluations demonstrate the sensors' reliability, adaptability to varying measurement ranges and stability under temperature and pressure fluctuations. As a result, this sensor system facilitates the real time detection and analysis of gas transport properties in pure gases including H₂, He, N₂, O₂ and Ar, making it suitable for pure gas sensing.

Abstract
1. Introduction
2. Experimental Procedure
    2.1. Specimen preparation and high-pressure gascharging
    2.2. Volumetric measurement of the released gasfrom charged polymers
    2.3. Manometric measurement of the released gasfrom charged polymers
    2.4. Analysis program for obtaining transportparameters
3. Results and Discussion
    3.1. Volumetric measurement
    3.2. Manometric measurement
    3.3. Performance comparison between volumetricand manometric gas sensors
4. Conclusion
References
Author Information

• Ji Hun Lee(Hydrogen Energy Group, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea) Corresponding author
• Sang Koo Jeon(Hydrogen Energy Group, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea)