Controls using AC voltages are still
not uncommon, so when position
indication is needed on pneumatic
cylinders but feedback is 110V, a
solution is at hand in the form of the
MR range from ifm electronic.

The MR range is reported to be
very simple to fit. If the cylinder has
a T-shaped slot, the sensor just drops
in and a twist of the fastening disc
secures it. For tie-rods or other
cylinder forms, ifm supplies adapters
for many common cylinder types.

The insert moulding technique
used to manufacture the MR range
of reed switches renders them
mechanically robust and absolutely
sealed against moisture ingress. LED
indication is standard, and in-line
connectors are offered. Operating
voltage of these two-wire devices
ranges from 5 to 120V AC or DC
(limited to 50V AC or 60V DC in the
connector versions), which on DC
will switch PNP or NPN.