SERIES BNS250
Coded-Magnet Sensors
Features & Benefits
• Compact size
… ideal for limited space applications.
• Sealed for submersibility
… assures long-term reliability
in the most hostile environments.
• Tamper-resistant
… cannot be bypassed with simple
magnets.
• Rugged, corrosion-resistant housing
… tolerates most
industrial environments.
• Integral LED status indicators
… facilitate easy
installation and provide visual indication of switch status.
• Shock and vibration tolerant
… designed to withstand
mechanical abuse.
• Satisfy CE & fail-to-safe requirements
… when used with
Series AES safety controllers.
Description
The Series BNS250 coded-magnet sensors are designed for
use as a safety interlock switch on movable machine
guards/articulating robot arms. Each sensor set consists of a
multiple reed switch unit and a coded-magnet actuator. The
reed switches, wired in series, will only close in the presence
of their matched magnetic field array.
Both switch and magnet assemblies are sealed to IP67
(submersible) standards. Their tamper-resistant design
prevents bypassing with a simple magnet or improperly coded
magnetic field. In addition, the BNS module features a 1-
meter long prewired pigtail.
AVAILABLE STANDARD MODELS
(Please order BPS250 magnet separately)
Part Number
BNS250-11z
BNS250-12z
BNS250-11zG
BNS250-12zG
Contact
Configuration*
1 NO & 1 NC
1 NO & 2 NC
1 NO & 1 NC
1 NO & 2 NC
Description
Multiple reed switch
(24VDC/100mA) assembly
with 1-meter prewired
pigtail
Multiple reed switch
(24VDC/10mA) assembly
with 1 meter prewired pigtail
and built-in LED display
Multiple reed switch
(24VDC/10mA) assembly with
1 meter pigtail (side entry) and
built-in LED display
Coded-magnet actuator
Operation
The reed switch assembly is typically mounted to a stationary
portion of a guard structure, with the coded-magnet assembly
mounted to the movable element of the machine guard. When
the guard is closed, and the matched magnetic field aligns
with the reed switch unit, the switches will close. When the
guard is open, or the required magnetic-field array is not
properly aligned with the reed switch assembly, the sensor
output will remain “off.”
BNS250-11zG-2205
1 NO & 1 NC
BPS250
N/A
*Contact configuration in presence of BPS250 coded-magnet
actuator.
Typical Applications
The sealed, compact BNS250 is ideal for use on movable
machine guards in hostile environments. Typical applications
include food processing equipment, chemical processing
equipment, woodworking machinery, packaging machinery,
and articulating robot arm rest position sensing.
*Important Note:
Series BNS Coded-magnet sensors are for use
in safety applications only when used with a
SCHMERSAL Series AES safety controller.
(Please see selection chart on Page 130.)
!
"
USE WITH ANY OTHER SAFETY CONTROLLER MAY
DAMAGE SENSOR AND/OR VOID WARRANTY.
114
BNS250 TECHNICAL DATA
MECHANICAL SPECIFICATIONS
Housing
Switching Distance “S”*
Degree of Protection
Operating Temperature
Operating Principle
Shock Resistance
Vibration Resistance
Conformity to Standards
Fiberglass reinforced thermoplastic
“On”: 4mm (0.16")
“Off”: 14mm (0.55")
IP67
–13°F to +158°F
Magnetic
30g/11ms
10 to 55 Hz, amplitude 1mm
CE, UL, CSA
VDE 0660 Part 209
ELECTRICAL SPECIFICATIONS
Maximum Operating Voltage
Maximum Continuous
Current Rating
Maximum Switching
Capacity (Power Rating)
Type Connection*
24VDC
100 mA (BNS250-11z/12z)
10 mA (BNS250-11zG/12zG)
1W (BNS250-11z/12z)
240mW (BNS250-11zG/12zG)
1 meter long LiYY4* 0.25mm
2
(23AWG) pre-wired pigtail
*Longer prewired cables (3M, 5M, or 10M lengths) available on
request. Please consult factory.
*Without ferromagnetic material in vicinity of switch or magnet. The
proximity of ferrous material may affect switching distances.
DIMENSIONS
33
1.30
22
.87
13
5.1
ø4,5
.18
13
.51
8,7
.34
25
.98
19
.75
33
1.30
22
.87
25
.98
19
.75
ø4,5
.18
13
.51
8,7
.34
1000
39.37
mm
inch
Note: BNS250 reed switch assemblies should be mounted at least 50mm (2") apart.
WIRING DETAILS
BNS250-11z
13
(black)
21
(white)
14
(blue)
22
(brown)
13
(black)
21
(white)
BNS250-12z
14
(blue)
C
(brown)
13
(black)
21
(white)
BNS250-11zG
14
(blue)
22
(brown)
13
(black)
21
(white)
BNS250-12zG
14
(blue)
C
(brown)
5
MISALIGNMENT ALLOWANCE
3,5
.14
3,5
.14
3
.12
0
1,5
.06
2
.08
3
.12
2
.08
4
.16
3
.12
2
.08
1
.04
2,5
.10
115
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