Ultra pure gas preparation and the use of ultra pure gas in gas protection, many industrial department is often need analysis for trace water in the gas. At present most commonly used is the dew point method, the downside is instrument can only be dedicated; With GC7990 high thermal conductivity detector sensitivity gas chromatograph, it not only can easily detect trace water in ultra pure gas, but also can be used to measure trace gases impurity in the ultra pure gas and other organic material analysis. Gas chromatograph is simple, and it's convenient accurate quantitative.

                超純氣體制備和用超純氣體做保護氣的許多工業部門,對氣體中微量水是需要經常分析的。目前常用的大都是露點法,其缺點是儀器只能;而用GC7990高靈敏度熱導檢測器氣相色譜儀,不但可方便地測出超純氣體中的微量水,而且還可以測定超純氣體中的微量氣體雜質及作其它有機物分析之用。氣相色譜儀操作簡單,定量也較方便準確。