What are the commonly used online hydrogen analyzers at present?
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What principle do the commonly used online instruments for detecting 0-100% hydrogen currently in use operate on?
On our devices, a thermal conductivity hydrogen analyzer is used for ranges of 40–100%; some devices, on the other hand, use chromatography to detect hydrogen content within any range from 0–100%.
The owner’s requirements for the measurement range are really high. Chemical plants are equipped with hydrogen-cooled units for measuring the hydrogen content; purity is the key parameter, with values generally ranging from 70% to 100%. In such cases, either thermal conductivity or density can be used for measurement, but the accuracy and precision of these methods are not very high. An important factor affecting accuracy and precision is whether the components other than hydrogen exist in a single form or vary in a fixed ratio. If the measurement range is wide and the components are complex, gas chromatography is recommended.
Agree with the view above; thermal conductivity methods are not suitable for very wide measurement ranges; gas chromatography should be considered for such wide ranges.
Adding to what was said on floor 3: in the case of tri-nine or tetra-nine hydrogen, there are generally methods available to measure the main impurities, thereby calculating and deducing the hydrogen concentration. For example, common impurities in high-purity hydrogen include CO/CO2/CH4; to determine the concentration of these impurities, low-range infrared spectroscopy or chromatography can be used, and nowadays QCL lasers are also employed for this purpose.