Page 141 of catalogue Position sensors and object detection systems of ifm Electronic GmbH

Magnetic sensors

Sensing range and switching curves The following Tables show the sensing ranges Sn and the switching curve diameter SD referred to different damping Magnets (M 1.0 up to M 5.1).
travel distance st

Type of magnet M 1.0 M 2.0 M 3.0 M 4.0 M 5.0 M 5.1

Sn on / off [mm] 24 / 26 (27 / 30) 24 / 26 (27 / 31) 34 / 36 (38 / 42) 60 / 65 (70 / 76) 68 / 72 (77 / 85) 66 / 70 (76 / 84)

SD1 [mm] 15 (17) 17 (19) 20 (24) 37 (40) 40 (44) 42 (48)

SD2 [mm] 13 (15) 15 (16) 18 (20) 38 (41) 39 (45) 35 (38)

Installation types Magnetic switches can be mounted flush with all materials (even metals) without reduction in the sensing range. Only exception: For magnetisable materials the sensing range is reduced. Tables show the open space to be left when the sensor is mounted in magnetisable materials so that the sensing range is not reduced by more than 5 %.
Type of sensor ME (M8 x 1) MF (M12 x 1) MG (M18 x 1) MS (rectang.) Reference magnet: M 4.0 Open space [mm] 15 10 10 10

sn

sD2 sD1 1/2sn 2/3sn

N

S

a

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Technical information and customer service

Accessories

Installation in magnetisable materials: Sensor must not be mounted flush.

Connection technology

For the installation of the (permanent) magnet it should also be taken into account that the sensing range is reduced by up to 60 % when the sensor is mounted in magnetisable materials. If the magnet is however mounted on magnetisable materials, the sensing range increases.

Evaluation systems, Power supplies

Encoders

Object recognition

Sensing range and switching curve diameter depend on the damping magnet.

Photoelectric sensors

Valve Sensors

*different values for type MG (M18 x 1) in brackets

Safety technology

Magnetic sensors, Cylinder sensors

Travel distance: It is the length of the section which is covered by the magnet in the sensing zone.

Capacitive sensors

The following applies to the magnetic switches of type ME (M8 x 1), MF (M12 x 1) MG (M18 x 1)* and MS (rectangular, 28 x 16 x 10 mm):

Inductive sensors

List of articles

Travel The travel distance is the distance the magnet covers when passing the active zone of the sensor. It thus depends on the strength of the magnet. For cylinders the travel distance is between 5 and 20 mm (depending on the cylinder type). The typical hysteresis is 5 % and remains constant. The short response times of the sensors allow very high travel speeds.

switching curve

Ø magnet
General information

S N

S N