Most optical fire and flame detectors have automatic internal self-tests for checking its viewing window lens cleanliness. These detectors include UV, UV/IR, Multi-Spectrum UV/IR/VIS, Multi-spectral IR, Single Band IR, Dual Band IR, Triple Band IR, Multi-Spectrum Triple IR, QuadBand Triple IR, etc. However, these detectors´ automatic tests do not constitute a fully functional "end to end" detector test. The automatic self-tests only partially check the operational readiness of a detector since the actual alarm outputs are not activated.....
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