Hexamite proximity switches operation and implementaion

Proximity Switches Operation and I/O configuration

The flush mounting type can be mounted inside a metal casing, but if used in that manner the proximity tripping range is de-rated to 70%. Non flush types must have the sensor head clear from the metal as shown above.

Connecting the switch to the logic controller, microprocessor or a relay.
Three wire PNP switch (fig.w1) The image on the right illustrates a three wire connection, using brown, black and blue wires. Power is supplied to the +ve connection, and the sourcing output connects the load line to the +ve line when the proximity is breached. Hence voltage on the output will be approximately the same as the voltage on the +ve wire.
Three wire NPN switch (fig.w2) Like the switching configuration shown above, this configuration uses brown, black and blue wires to pull current trough the load by (effectively) shorting the black wire to the blue wire, whenever an object breaches proximity. Hence the voltage across the load becomes approximately the same as the voltage across the +ve and -ve terminals.
Four wire NPN switch (fig.w3) This configuration has two output where one is the inverted copy of the other. NC means normally closed, i.e. the blue wire is effectively shorted to the black wire (-ve). When the proximity of the sensor is breached, the normally closed circuit opens. The NO (normally open) load of the yellow wire behaves like the configuration for the three wire NPN switch (fig.w2) above.
Four wire PNP switch (fig.w4) The image on the right shows two load possibilities, one is NC (normally closed), it is effectively shorted to the (+ve) wire until an object breaches the proximity distance of the sensors. The NO (normally open) yellow wire behaves like the configuration shown in fig.w1

Switch action repeatability is typically within 0.2% for inductive sensors and hysterisis are between 5 and 15% of sensing distance. Response time for DC switches is from 0.3 mS, and up to 70 mS for AC switches.