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Fixed formaldehyde detection alarm MIC-500-CH2O-A Features: ? â— Explosion-proof grade is ExdIICT6 â— High-precision, long-life imported electrochemical formaldehyde sensor â— Automatic tracking zero point, full scale, temperature compensation â— Anti-high concentration gas impact Automatic protection function â— Full software calibration function, users can also calibrate by themselves, with 3 buttons, easy to operate â— Three-wire 4~20mA output, live sound and light alarm optional, contact output optional â— Two cable entries Mouth, convenient on-site installation â— Independent air chamber structure, easy sensor replacement