Autosen AI006 Manuel utilisateur

Operating principle of an inductive

proximity sensor

autosen AI001- AI065

autosen AI401- AI408

autosen AI801- AI816

autosen AI901- AI908

2502588 / 00 02 / 2019

Made in EU

1. Operating principle of an inductive proximity sensor

The coil and capacitor form an LC circuit, also known as a basic sensor. Eddy current

losses in electrically conductive materials are used for a switching signal.

2. Terms:

Active zone / active

face

Space (room) above the sensing face in which the sensor reacts to the

approach of the damping material.

Output function Normally open: Object within the active zone

> Output switched.

Normally closed: Object within the active zone

> Output blocked.

Programmable: Normally closed or normally open can be freely selected.

Positive switching: Positive output signal (to L–).

Negative switching: Negative output signal (to L+).

Rated insulation

voltage

DC units with protection class II: 250 V AC

DC units with protection class III: 60 V DC

Rated short-circuit

current

For short-circuit-proof units: 100 A

Rated impulse with-

stand voltage

DC units with protection class II: 4 kV (≙overvoltage category III)

DC units with protection class III: 60 V DC: 0.8 kV (≙overvoltage

category II)

Power-on delay time The time the sensor needs to be ready for operation after application of

the operating voltage (in the millisecond range).

Operating voltage The voltage range in which the sensor functions safely. A stabilised and

smoothed direct voltage should be used!

Take into account residual ripple!

1: Connection

2: Housing

3: Downstream electronics

4: Capacitor

5: Pot core

6: Coil

7: Alternating electromagnetic eld = active face

8: Target = electrically conductive material

Current consumption Current for the internal supply of 3-wire DC units.

Degree of soiling Inductive proximity sensors are designed for degree of soiling 3.

Hysteresis Difference between the switch-on and the switch-off point.

Short-circuit pro-

tection

If autosen sensors are protected against excessive current by means of

a pulsed short-circuit protection, the short-circuit protection may cut in

with incandescent lamps, electronic relays and low resistance loads.

Standard target Square steel plate with a thickness of 1 mm and a side length identical

to the diameter of the sensing face or 3 x Sn, depending on which value

is greater.

Product standard IEC 60947-5-2

Repeatability = Repeat precision

Difference between any two Sr measurements. Max. 10% of Sr.

Switch point drift Shift in the switch point owing to changes in the ambient temperature.

Switching frequency Damping with standard target at half Sn. The ratio damped to undamped

(mark to space) = 1 : 2.

3. Sensing range (referred to the standard target)

Nominal sensing range Sn= characteristic value of the unit

Real sensing range Sr= individual deviation at room temperature between 90% and 110%

of Sn

Useful sensing range Su= switch point drift between 90% (Sumin = Sa) and 110% (Sumax)

of Sr

Safe sensing range =

operating distance Sa

= reliably switched between 0% and 81% of Sn

Safe switch-off distance = Sumax + max. hysteresis = 143% of Sn

4. Correction factors 5. Inuence of the standard target size

The sensor-specic values can be

found in the data sheet (exception

K1 units:

Same sensing range for all

X axis: Ratio between actual

target and the standard

target

6. Lateral approach and distances

7. Tips on ush and non-ush mounting in metal

Installation instructions for cylindrical designs

The principle of inductive sensor technology is based on an electromagnetic alternating eld created

via a copper coil embedded in an open pot core made of ferrite. An resonant circuit is created using

the capacitor. Thanks to an electrically conductive metal, located within a certain range in front of the

sensor, the eddy currents of the magnetic eld are strongly attenuated. These changes in the oscilla-

tion amplitude are detected by the sensor and the sensor is switched.

1. Typical switch-on curve (for slow approach)

2. Typical switch-off curve (for slow approach)

3. Poor repeatability

4. Good repeatability

The following applies for good repeatability of the

switch point: The closer the damping element is to

the sensor face the better. General recommendation:

a = 10% of the nominal sensing range.

1. Distance to the background

2. Recommended target distance

3. Recommended degree of coverage of

the sensing face

4. Recommended target size

The special feature of sensors which can be installed ush is the additional outer metal ring which

surrounds the coil. This shields the alternating eld and bundles it at the front.

non-ush mountable

sensor

Shielded coil with a ush

mountable sensor

Free zones

Free zones refer to areas around the sensor which must be kept free of metallic materials in order not

to compromise with the operating principle of the device.

With inductive sensors, a distance of at least three times the nominal sensing range must be main-

tained between a metallic material and the sensing face. The correct installation of non-ush mounta-

ble sensors also requires that there is no interference material within a distance less than the diameter

of the detection face. The sensing face projects out of the metallic environment by twice the length of

the nominal sensing range of the sensor.

d d≥ d d d≥ 2 x d

d = diameter of the

sensing face

(details in data sheet)

Sn = Nominal sensing range

(details in data sheet)

≥ d

≥3 x Sn

≥2 x Sn

≥3 x Sn

non-ﬂush

mountable sensor

ﬂush

mountable sensor

Flush and non-ush mountable

In principle, “ush” and “non-ush” mounting are only of relevance in metal environments. All non-met-

als such as plastics, wood and glass have no inuence on the mounting.

With ush mountable sensors, the sensing face of the sensor may be aligned level with the metal

installation environment. Needless to say, these sensors can also be mounted in a non-ush manner.

Sensors which are non-ush mountable, on the other hand, must not be installed level with the sur-

rounding metal surface. The metallic installation environment would cancel out the sensor’s alternating

eld and cause the sensor to switch continuously.

d = diameter of the

sensing face

(details in data sheet)

Mutual inuence

In applications in which two inductive sensors must be installed opposite each other, they should be

spaced out at a distance of at least eight times that of the nominal sensing ranges. With series connec-

tion, the spacing between the units must be observed.

≥8 x Sn

8. Installation instructions for rectangular designs AI006-AI009, AI407, AI408

ush: AI006, AI008, AI407

h=any

non-ush: AI007, AI009, AI408

Align the sensing face

flush

non-flush

Sn = Nominal sensing range

Art. no. Mounting Sensing range /

frequency

Switching

output

Structural

shape

Connectors

AI006 Flush 20 mm / 100 Hz Normally open Cubic M12

AI007 Non-flush 35 mm / 80 Hz Normally open Cubic M12

AI008 Flush 20 mm / 100 Hz Antivalent Cubic M12

AI009 Non-flush 40 mm / 60 Hz Antivalent Cubic M12

AI050 Flush 2 mm / 5000 Hz Normally open M8 thread M8

AI051 Non-flush 4 mm / 5000 Hz Normally open M8 thread M8

AI052 Flush 2 mm / 5000 Hz Normally closed M8 thread M8

AI053 Non-flush 4 mm / 5000 Hz Normally closed M8 thread M8

AI054 Flush 4 mm / 2000 Hz Normally open M12 thread M12

AI055 Non-flush 8 mm / 2000 Hz Normally open M12 thread M12

AI056 Flush 4 mm / 2000 Hz Normally closed M12 thread M12

AI057 Non-flush 8 mm / 2000 Hz Normally closed M12 thread M12

AI058 Flush 8 mm / 2500 Hz Normally open M18 thread M12

AI059 Non-flush 12 mm / 2000 Hz Normally open M18 thread M12

AI060 Flush 8 mm / 2500 Hz Normally closed M18 thread M12

AI061 Non-flush 12 mm / 2000 Hz Normally closed M18 thread M12

AI062 Flush 15 mm / 200 Hz Normally open M30 thread M12

AI063 Non-flush 20 mm / 200 Hz Normally open M30 thread M12

AI064 Flush 15 mm / 200 Hz Normally closed M30 thread M12

AI065 Non-flush 20 mm / 200 Hz Normally closed M30 thread M12

9. Classication of inductive sensors

autosen inductive sensors - standard class

for standard applications & factory automation in the standard designs M8, M12, M18, M30 & cubic

Find a wealth of technical information, incl. engineering data and suitable genuine accessories, at:

autosen.com/standard-class

autosen inductive sensors - high resistance class

Can be used in machine tool manufacture, resistant to oils & coolants.

Find a wealth of technical information, incl. engineering data and suitable genuine accessories, at:

autosen.com/high-resistance

Art. no. Mounting Sensing range /

frequency

Switching

output Structural shape Connectors

AI001 Flush 2 mm / 800 Hz Normally open M8 thread M8

AI002 Flush 2 mm / 800 Hz Normally open M8 thread M12

AI003 Flush 4 mm / 700 Hz Normally open M12 thread M12

AI004 Flush 8 mm / 400 Hz Normally open M18 thread M12

AI005 Flush 15 mm / 100 Hz Normally open M30 thread M12

AI024 Flush 2 mm / 1300 Hz Normally closed M8 thread M8

AI025 Flush 4 mm / 700 Hz Normally closed M12 thread M12

AI026 Flush 8 mm / 400 Hz Normally closed M18 thread M12

AI027 Flush 15 mm / 100 Hz Normally closed M30 thread M12

AI034 Flush 2 mm / 800 Hz Normally open Ø 6.5mm, smooth M8

AI035 Non-flush 4 mm / 700 Hz Normally open Ø 6.5mm, smooth M8

AI038 Flush 4 mm / 700 Hz Normally open M12 thread M12

Art. no. Mounting Sensing range /

frequency

Switching

output

Structural shape Cable

AI901 Flush 2 mm / 5 kHz Normally open M8 thread 5 m cable

AI902 Non-flush 4 mm / 5 kHz Normally open M8 thread 5 m cable

AI903 Flush 2 mm / 5 kHz Normally closed M8 thread 5 m cable

AI904 Non-flush 4 mm / 5 kHz Normally closed M8 thread 5 m cable

AI905 Flush 4 mm / 5 kHz Normally open M12 thread 5 m cable

AI906 Non-flush 8 mm / 5 kHz Normally open M12 thread 5 m cable

AI907 Flush 4 mm / 5 kHz Normally closed M12 thread 5 m cable

AI908 Non-flush 8 mm / 5 kHz Normally closed M12 thread 5 m cable

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