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D12s are compact, totally self-contained visible-red fiber optic sensors for DIN rail mounting. D12 sensors are designed for use with Banner glass and cut-to-length plastic fiber optics. Standard D12FP and D12FV plastic and glass fiber optic sensors offer fast 0.5 millisecond response. D12FVY Series and D12FPY Series sensors have switch-selectable 50µs/500µs response modes for applications that require a faster, high speed response time (50 µs as compared to the 500 µs of FP and FV models). D12FVY1 and D12FPY1 models have switch-selectable response times along with a built-in 20 millisecond pulse stretcher for use with loads (or input circuits) that are too slow to react to quick sensing events when using the 50µs response mode.