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SF6安全保障专家
专注于SF6气体检测的专业化
What are the principles and characteristics of measuring SF6 decomposition products by the detection tube method?
发布时间：2017-03-05
来源：ydlcb 浏览次数：38次
The principle of the detection tube method for measuring SF6 decomposition products is to use the measured gas to flow through the detection tube at a certain flow rate within a pre-set time, and chemical substances filled in the test tube of the tested gas Yui will undergo chemical reactions, and the content of decomposition products in the gas will be indicated by the length of the color change of the indicator in the detection tube. For example, the HF gas detection tube is filled with silica gel carrier in the glass, and the carrier is coated with sodium hydroxide and acid-base indicator. When HF and sodium hydroxide neutralize, the acid-base indicator changes color, and the scale indicator corresponding to the color can be read to determine the HF content.
The detection tube can measure a variety of gas components, generally used to detect SF6 decomposition products HF, SO2, H2S, H2O, etc., HF and SO2 detection limits are 1.5ul/l and 1.0ul/l, respectively.
The detection tube method is simple to operate, convenient to carry, and suitable for quick field detection and simple measurement. However, its range is limited, the measurement accuracy is poor, the detection tube is valid for 1-2 years, expired storage is easy to fail. The detection component is single, can not meet the needs of multi-component detection, and the use of certain limitations.