Glossary for detailled explanation - take your pick:
Sensors with function indicators should be decoupled at the output when they are used in parallel connections. This avoids that all LEDs of the sensors are switched on when only one output stage is interconnected. A parallel connection of 2-wired sensors is not recommendable.
The output stage contains a PNP transistor which connects the load against the positive operating voltage (+Ub). The load is switched between the output and the negative operating voltage (0V).
Polarised light is light that is only oscillating in one level and not in any number of levels like natural light does.
Polarising filters (for example plastic films with stripes) are filters for the creation of polarised light. Natural light (as well as the light of the transmitter diodes) is unpolarised. After the light has been conducted through a polarising filter, it only remains the part of the original light that oscillates in the polarising direction of the filter. For reflections at specular surfaces, the polarisation remains the same. It is only possible that the polarising direction changes. Diffuse reflection destroys the polarisation. By choosing the right filters and arrangement, this difference can be used to eliminate the disturbing effects created by the reflecting surfaces.
(also: Minimum Operating Current Im) Each sensor demands domestic current for the function of the amplifier's and switching stage's LEDs. This does not contain the current that flows through the load.
Protection classes are used to classify and characterise electric devices in regard to existing security measures to avoid electric shocks. The protection classes are defined superiorly for all electric devices in DIN EN 61140 (VDE 0140-1). There are four classes as follows: Class 0 = no protection against electric shocks, no protective conductor connection Class 1 = protective grounding/ protective conductor system, non-switched with the electrical installation Class 2 = protective insulation, reinforced or double insulation between supply and output voltage, no protective conductor Class 3 = protective low voltage (