31
Proximity Sensors
1
Proximity Sensors,
Inductive Sensors
1
.1
Germany: +49 621 776-4411
Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
Pepperl+Fuchs Group
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Copyright Pepperl+Fuchs
Mutual interference
To be able to detect metal, inductive sensors use a sensor coil to gener-
ate an electromagnetic AC field. This AC field evaluates the smallest of
changes in the immediate vicinity of the sensor element. A change can,
for example, result from a metal plate approaching the sensor.
Even an external magnetic AC field, e.g., that of an adjacent sensor, can
affect the switching characteristics. Therefore, a minimum distance must
be maintained between two adjacent sensors.The minimum distance be-
tween two sensors can be determined as follows.
D
F
D
D
F
D
Non-flush mountable sensor,
F must be 4 times
the housing diameter.
Flush mountable sensor,
F must be twice
the housing diameter.
F = 4 x diameter (D)
F = 2 x diameter (D)
If the application does not allow a minimum distance to be maintained,
sensors with offset oscillation frequencies are available upon request.
These sensors can then be mounted directly beside each other.
Step 4: Electric data and connections
In addition to the operating distance, other important criteria include sen-
sor parameters such as the type and level of supply voltage. An overview
of the output circuits for our sensors is included in this catalog from page
8.
In terms of supply voltage, our wide product range includes DC, AC, and
AC/DC sensors.
For each of our sensor series, the available supply voltage types and out-
put types are outlined briefly and clearly in the product selection tables
Step 5: General specification
The
no-load current I o
specifies the individual power consumption of
the proximity switch. It is measured without load.
The
operating current I L
(
rated operating current I e according to EN
60947-5-2)
specifies the maximum load current for continuous operation.
The
short-time current I K
is the current that may occur for a short time
when switching on, without damaging the proximity switch.
The
leakage current I R
is the current that flows via the load when the
proximity switch is locked.
The
operating voltage U B
is specified with the maximum and minimum
values for the supply voltage.The proximity switch can be operated safely
in this area. The rated voltage is specified for NAMUR proximity sensors.
The
voltage drop U d
is measured via the controlled proximity switch or
output.
The
switching frequency f
is the maximum number of changes from
attenuated to non-attenuated state in Hertz (Hz), see also the figure in
accordance with EN 60947-5-2.
Measurement a is the greater value of either the diameter or the edge
length and the three-fold rated operating distanc
a
2
a
a
a
Sn
2
Actuator to determine the maximum switching frequency.
The
harmonic voltage
,
also referred to as ripple or residual ripple, is
the AC voltage (peak-to-peak) that is superimposed over the operating
voltage and specified as a percentage of the arithmetic average value.
Pepperl+Fuchs GmbH sensors feature max. 10% of the residual ripple
and comply with standard DIN EN 60947-5-2.
Permissible interference voltage
Short-term voltage peaks on the supply lines can damage unprotected
proximity switches. Transient protection on all sensors by Pepperl+Fuchs
GmbH suppresses noise pulses in accordance with EN 60947-5-2.
The
time delay before availability t v
is the time taken until a proxim-
ity switch is ready for operation once the operating voltage has been
switched on.
Pepperl+Fuchs GmbH proximity switches feature max. 300 ms and com-
ply with EN 60947-5-2.
Switch-on pulse suppression
All proximity switches are equipped with this feature, which suppresses a
fault signal at the output when the operating voltage is switched on dur-
ing time t v .
Short circuit current limitation
In the case of short circuit current limitation, which is included in most
proximity switches by Pepperl+Fuchs GmbH, if the current trip value is
exceeded the output is periodically locked and re-released until the short-
circuit is fixed.
The permissible ambient temperature is the temperature range within
which the proximity switch operates properly. The following apply to the
Pepperl+Fuchs GmbH standard series:
-25
°C ... +70 °C or 248 K ... 343 K.
Degree of protection
Depending on the requirements, proximity switches by Pepperl+Fuchs
GmbH are IP65, IP67, or IP68 (EN 60529) protected
Permissible shock and vibration load
The shock resistance test is carried out at 30 times ground accelera-
tion and 11 ms duration. The vibration resistance test is conducted at a
resonance frequency between 10 and 55 Hz and 1 mm amplitude (IEC
60068-2-6).
Permissible tightening torque [Nm]
Stainless
steel
Brass
PBT
PPS
M5 x 0.5
3.0
-
-
-
M8 x 1
10.0
3.0
-
-
M12 x 1
15.0
10.0
0.75
-
M18 x 1
30.0
30.0
1.5
5
M30 x 1.5
30.0
30.0
3.0
10
Introduction, Inductive Sensors
