The D12 series compact totally self-contained visible-red Fibre Optic Sensor for DIN rail mounting. D12 sensors are designed for use with Banner glass and cut-to-length plastic fibre optics. Standard D12FP and D12FV plastic and glass fibre optic sensors offer fast 0.5 millisecond (500µs) response. D12s are available with a choice of NPN or PNP complementary outputs (one output normally open, one output normally closed). The normally closed output of FP and FV models (only) may be used as a diagnostic alarm output, depending upon the hook-up of the sensor to the power supply. All models are available with either an attached cable or a 6" pigtail with a pico-type quick disconnect connector. There is one D12 model line for glass fibres and another for plastic fibres. Two top-mounted LED indicators light to indicate POWER ON and NORMALLY OPEN output conducting conditions.