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可控气氛中,CO_2和 H_2O 的测量,对于判断气氛的氧化—还原、渗碳—脱碳具有非常重要的意义。目前国内外已经有很多种仪表用来测量炉气中 CO_2及 H_2O 的含量。如红外线 CO_2分析仪、电导 CO_2测量仪、氯化锂露点仪、雾室露点仪、冷镜面露点仪和露点杯等。此外还有用于全分析的奥氏气体分析仪、和气相色谱仪。但是无论那种自动测量仪表都必须用基准仪器或标准样气来校对。露点杯广泛用来做为基准仪器校对各种露点仪。其结构简单,测量方便,稳定可靠。误差可达到±1℃。但是 CO_2分析仪表,目前还没有象露点杯那样一种基准校对仪器。只能用标准样气校对。可是标准样气一般厂无法配制和标定。本试验证明,CO_2的非水测定法可用来做为 CO_2分析仪表的基准校对方法,以及标定自己配制的样气。这点可以和露点杯相媲美。当加上一些附加装置后,还可以测量其他含碳气体(如 CO、CnH_2n及 CH_4等)。
Controllable atmosphere, CO_2 and H_2O measurements for the determination of the atmosphere oxidation - reduction, carburizing - decarburization has a very important significance. At present, there are many kinds of instruments used at home and abroad to measure the content of CO_2 and H_2O in the furnace gas. Such as infrared CO_2 analyzer, conductivity CO_2 measuring instrument, lithium chloride dew point meter, fog chamber dew point meter, cold mirror dew point meter and dew point cup. In addition, there are austerity gas analyzers for full analysis, and gas chromatographs. But no matter what kind of automatic measuring instruments have to use the reference instrument or standard sample to proofread. Dew point cup is widely used as a benchmark instrument to check a variety of dew point meter. Its structure is simple, easy to measure, stable and reliable. The error can reach ± 1 ℃. However, CO_2 analytical instruments, there is no such as a dew point cup benchmarking instrument. Can only be calibrated with a standard sample. However, the general standard gas sample can not be prepared and calibrated. This test proves that CO 2 non-aqueous assay can be used as a baseline calibration method for CO 2 analytical instruments, as well as calibration of their own sample preparation. This can be comparable with the dew point cup. When adding some additional devices, you can also measure other carbon-containing gases (such as CO, CnH_2n and CH_4, etc.).