SHP8400PMS-LD Differential Electrochemical Mass Spectrometer
Introduction： DEMS can qualitatively and quantitatively measure the gas produced or consumed by fuel cells during production, storage and operation in real time. DEMS can be applied to direct alcohol fuel cells, hydrogen-oxygen fuel cells and other types of fuel cells. DEMS can realize real-time online monitoring of reactants (methanol, ethanol, hydrogen, oxygen) and intermediate products and by-products (carbon dioxide, aldehydes, acids, etc.) in the application of direct alcohol fuel cells and hydrogen-oxygen fuel cells . The volatile gas products produced by the electrochemical reaction in the electrochemical test cell can be measured by an electrochemical mass spectrometer. The gas generated in the electrochemical test cell enters the sampling capillary injection assembly, is heated and volatilized, and is loaded into the online mass spectrometer along with the high-purity helium gas at a constant temperature. The electron bombardment ion source (EI) can generate electrons with a certain energy, and ionize the compound to be detected in the ionization chamber to form molecular ion fragments and fragment ions. The required ions are screened by a mass analyzer and then arrive at the detection sequentially according to the mass-to-charge ratio. The signal is amplified and recorded to obtain a gas change trend graph. Features: 1. The capillary sampling assembly is composed of capillary tube, evaporation chamber, heating system, carrier gas system and backing pump; 2. The use of a smaller volume of the evaporation chamber can meet the needs of the experiment, and can reduce the dead volume of the gas to a greater extent, and avoid the mixing of gases in different time periods; 3. Adopt high-precision heating system to ensure the consistency of gas; 4. The carrier gas system and the foreline pump can ensure the renewal of the gas and shorten the pipeline transmission time; 5. The filament uses thorium-coated iridium wire, which has strong water resistance and oxidation resistance, and can withstand continuous sample gas injection for a long time and maintain long-term stability; 6. Adopt Faraday tube/electron multiplier dual detectors, which can simultaneously measure different concentrations of gas; technical parameter: Quality range: 1-200amu Mass analyzer: Quadrupole Ion source: Electron bombardment ion source Detector: Faraday tube/electron multiplier Detection limit: 10ppm (Faraday tube), 10ppb (electron multiplier) Mass axis stability: <±0.1 amu/72h Vacuum system: oil-free diaphragm pump and turbo molecular pump Data output: Ion current intensity data output and online calculation of percentage concentration Quantity of detection components: unlimited
Introduction： DEMS can qualitatively and quantitatively measure the gas produced or consumed by fuel cells during production, storage and operation in real time. DEMS can be applied to direct alcohol fuel cells, hydrogen-oxygen fuel cells and other types of fuel cells. DEMS can realize real-time online monitoring of reactants (methanol, ethanol, hydrogen, oxygen) and intermediate products and by-products (carbon dioxide, aldehydes, acids, etc.) in the application of direct alcohol fuel cells and hydrogen-oxygen fuel cells . The volatile gas products produced by the electrochemical reaction in the electrochemical test cell can be measured by an electrochemical mass spectrometer. The gas generated in the electrochemical test cell enters the sampling capillary injection assembly, is heated and volatilized, and is loaded into the online mass spectrometer along with the high-purity helium gas at a constant temperature. The electron bombardment ion source (EI) can generate electrons with a certain energy, and ionize the compound to be detected in the ionization chamber to form molecular ion fragments and fragment ions. The required ions are screened by a mass analyzer and then arrive at the detection sequentially according to the mass-to-charge ratio. The signal is amplified and recorded to obtain a gas change trend graph.
