Which teacher understands the principle of toxic gas detectors?
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What is the working principle of alarms such as electrochemical detectors, photoionization detectors, and flame ionization detectors? What is its selectivity? I understand something about the principle of catalytic combustion gas detectors, so I can design them flexibly. However, I’m completely confused by the principle of toxic gas detectors when I look for information online; could any teacher explain it to me? It’s best to have your own understanding, rather than copying from the Internet. GBZT223-2009 specifies that toxic gas detection and alarm devices in workplaces \"should\" be selective; then what does Appendix A list, which contains a bunch of non-selective detectors, mean? The Design Code for Detection and Alarm of Flammable and Toxic Gases in the Petrochemical Industry (GB50493-2009) states that detectors should be installed for those substances listed as highly toxic hazardous materials. However, GBZT223-2009 does not mention selective detectors for such gases; what should be done in such cases? For example, should detectors be installed for carbon disulfide? Does anyone among my friends have their own opinions on this? Thank you!
You’ve asked the wrong place; go ask in the Instrumentation and Automation section
Well, we also have experts in electrical engineering here!
Generally, the probes use electrochemical and catalytic combustion methods
What is the general working principle of electrochemistry?
A detector that measures the current generated by the oxidation or reduction of the gas under measurement at the electrodes, thereby determining the concentration of that gas