Page 67 - Sensors and Systems - North American Catalog
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Refer to General Notes Relating to Product Information
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Sensors and Systems
Two-wire AC sensors
These AC powered sensors are operated in series with the
load. While in closed state, a low residual current is used
to power the sensor and a voltage drop occurs across the
conductive switch.
Switching example:
BN
L
N
BU
The model number for this type of sensor includes the
reference -W. They are supplied as:
•
NC contact (WO)
•
NO contact (WS)
•
NC contact or NO contact (W)
(programmable wiring)
WARNING
Solid-state electronic switches must NOT be
tested with incandescent lamps or connected
to a load that exceeds their ratings. Observe the
model no. and wiring circuits to be sure they are
in agreement.
DO NOT CONNECT SWITCH DIRECTLY ACROSS
POWER LINE. INSTALLATION AND OPERATION NOT IN
ACCORDANCE WITH CATALOGED SPECIFICATIONS
MAY BE HAZARDOUS TO SAFETY OF PERSONS AND/
OR EQUIPMENT.
Due to continuing technological advances, the wiring
diagram on the actual sensor may be different than shown
on this instruction sheet. In all instances where the actual
sensor diagram is different, the wiring diagramon the sensor
must be used when electrical connections are made.
Two-wire universal current sensors
These are operated in series with the load. They can be
connected to either DC or AC power supplies. They are
overload protected and short-circuit proof. While in closed
state, a low residual current is used to power the sensor and
a voltage drop occurs across the conductive switch.
Switching example:
2
AC/DC
3
1
The model number for this type of sensor includes the
reference -U. They are supplied as:
•
NC contact (UO),
•
NO contact (US),
•
NC contact or NO contact (U) (programmable wiring)
Two-wire NAMUR sensors
NAMUR
sensors
(Normenarbeitsgemeinschaft
für
Mess- und Regelungstechnik der chemischen Industrie)
manufactured in accordance with EN 60947-5-6 (VDE 0660
Part 212) are two-wire sensors that have a constant (type N)
or non-constant (type N0) distance/current characteristic.
I/mA
s/mm
̟ ʽƔʼ à Ɠ ¾ÅÈÊ ¹¿È¹Ë¿Ê
·¹ÊË·Ê»º
ÄÅÊ ·¹ÊË·Ê»º
·¹¹»ÆÊ·¸Â» ÅƻȷʿĽ ȷĽ»
ż ʾ» ÉͿʹ¾ ·ÃÆ¿¼¿»È
ηÃÆ»Ɠ
ʺʷƖ ʸ̊
̞ ʷƔʸʼ Ã Ɠ
»·º ¸È»·Á·½»
I/mA
s/mm
I ≥ 6.5 mA: Short circuit
actuated
not actuated
I ≤ 0.15 mA:
Lead breakage
acceptable operating range
of the switch amplifier
Example: NCB2-12GM35-N0
The model number for this type of sensor includes the
reference -N or -N0. They are supplied as:
•
NC contact (N/N0)
•
NO contact (1N)
•
Dual channel NC contact (N4)
NAMUR sensors are connected to external switch amplifiers
that convert the current variation into a binary output signal.
Switching example:
BN
L+
L-
BU
Pepperl+Fuchs offers a range of approved switch amplifiers
for NAMUR sensors for use in hazardous and nonhazardous
applications.
WARNING
Refer to control drawing for application
requirements when applying sensors in
hazardous (classified) locations.
