Page 75 - Sensors and Systems - North American Catalog
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Proximity Sensors
1
Proximity Sensors,
Inductive Sensors
1
.1
Sensors and Systems for Factory Automation
Issue 2012
73
Germany: +49 621 776-4411
Refer to General Notes Relating to Product Information
Pepperl+Fuchs Group
USA: +1 330 486 0001
Singapore: +65 6779 9091
Copyright Pepperl+Fuchs
Proximity Switches
Introduction
Mutual interference
The minimum distance (F) must be maintained in order to
prevent
mutual
interference
between
adjacent
sensors.
Proximity sensors with altered frequencies are available on
request in case these distances cause application-related problems.
When using alternate frequencies between sensors, they can be mounted
adjacent to each other. Contact technical support for application-related
assistance.
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,
flush mount 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 sensing range, other important criteria include sensor
parameters such as the type and level of supply voltage. An overview of the
output circuits for our sensors is included in this catalog beginning with the
Sensor Connections/Sensor Outputs
section.
In terms of supply voltage, our wide product range includes DC, AC, and
AC/DC sensors.
Step 5: General specification
The
idle current I o
specifies the power consumption of the proximity
sensor. It is measured without load. It is also termed supply current.
The
operating current I L
(design 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 sensor. It is also termed
surge current.
The
residual current I R
is the current that flows through the load with the
proximity sensor open. It is also termed leakage current.
The
operating voltage U B
is indicated by the maximum and minimum
values for the supply voltage, i.e., 10...30 VDC. The proximity sensor can
be operated safely in this area. The rated voltage is specified for NAMUR
proximity sensors.
The
voltage drop U d
is measured across the conducting proximity sensor
output.
The
switching frequency f
is the maximum number of changes from
dampened to non-dampened state in Hertz (Hz), see also the figure in
accordance with EN 60947-5-2.
The spacing between targets should be twice the width of the
target. The width of the target should be equal to or greater
than the diameter of the sensor face, The maximum switching
frequency for each sensor is shown in the sensor data sheets.
a
2a
a
a
Sn
2
Measuring vane 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’
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 sensors. Transient protection on all sensors by Pepperl+Fuchs
suppresses noise pulses in accordance with EN 60947-5-2.
The
time delay before availability t v
is the time taken until a proximity
sensor is ready for operation once the operating voltage has been switched
on. Pepperl+Fuchs proximity sensors feature max. 300 ms and comply with
EN 60947-5-2.
Switch-on pulse suppression
All proximity sensors are equipped with this feature, which suppresses a
fault signal at the output when the operating voltage is switched on during
time t v .
Short-circuit current limitation
With short-circuit current limitation, which is included in most proximity
sensors by Pepperl+Fuchs, if the current trip value is exceeded the output
is periodically blocked and released again until the short-circuit is fixed
(pulsing).
The permissible
ambient temperature
is the temperature range within
which the proximity sensor operates properly. The following apply to the
Pepperl+Fuchs standard series:
-25 °C to +70 °C or -11 °F to +158 °F.
Degree of protection
Depending on the requirements, proximity sensors by Pepperl+Fuchs are
IP65, IP67, IP68or IP69K protected, depending on the model selected.
Permissible shock and vibration load
The shock resistance test is carried out at 30 times ground acceleration 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] (mounting)
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
