114
AVAILABLE STANDARD MODELS
(Please order BPS250 magnet separately)
Description
The Series BNS250 coded-magnet sensors are designed for
use as a safety inter lock switch on movable machine
guards/ar ticulating robot ar ms. 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.
Operation
The reed switch assembly is typically mounted to a stationar y
por tion 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.”
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 ar ticulating robot ar m rest position sensing.
Coded-Magnet Sensors
BNS250-11z 1 NO & 1 NC
BNS250-12z 1 NO & 2 NC
BNS250-11zG 1 NO & 1 NC
BNS250-12zG 1 NO & 2 NC
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
Part Number Contact
Configuration* Description
BNS250-11zG-2205 1 NO & 1 NC
BPS250 N/A Coded-magnet actuator
SERIES BNS250
Features & Benefits
• Compact size … ideal for limited space applications.
• Sealed for submersibility … assures long-ter m 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.
*Contact configuration in presence of BPS250 coded-magnet
actuator.
*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 char t on Page 130.)
USE WITH ANY OTHER SAFETY CONTROLLER MAY
DAMAGE SENSOR AND/OR VOID WARRANTY.
"
!
5
115
BNS250 TECHNICAL DATA
Maximum Operating Voltage 24VDC
Maximum Continuous 100 mA (BNS250-11z/12z)
Current Rating 10 mA (BNS250-11zG/12zG)
Maximum Switching 1W (BNS250-11z/12z)
Capacity (Power Rating) 240mW (BNS250-11zG/12zG)
Type Connection* 1 meter long LiYY4* 0.25mm2
(23AWG) pre-wired pigtail
Housing Fiberglass reinforced thermoplastic
Switching Distance “S”* “On”: 4mm (0.16")
“Off”: 14mm (0.55")
Degree of Protection IP67
Operating Temperature –13°F to +158°F
Operating Principle Magnetic
Shock Resistance 30g/11ms
Vibration Resistance 10 to 55 Hz, amplitude 1mm
Conformity to Standards CE, UL, CSA
VDE 0660 Part 209
MECHANICAL SPECIFICATIONS ELECTRICAL SPECIFICATIONS
DIMENSIONS
BNS250-12z
13
(black)
21
(white)
14
(blue)
C
(brown)
BNS250-11z
13
(black)
21
(white)
14
(blue)
22
(brown)
BNS250-11zG
13
(black)
21
(white)
14
(blue)
22
(brown)
BNS250-12zG
13
(black)
21
(white)
14
(blue)
C
(brown)
WIRING DETAILS
0
1
.04
2
.08
3
.12
4
.16
2
.08
3
.12
2
.08
1,5
.06
2,5
.10
3
.12
3,5
.14
3,5
.14
MISALIGNMENT ALLOWANCE
*Longer prewired cables (3M, 5M, or 10M lengths) available on
request. Please consult factory.
Note: BNS250 reed switch assemblies should be mounted at least 50mm (2") apart.
*Without ferromagnetic mater ial in vicinity of switch or magnet.The
proximity of ferrous material may affect switching distances.
33
1.30
22
.87
13
.51
25
.98
1000
39.37
13
5.1
19
.75
8,7
.34
ø4,5
.18
33
1.30
22
.87
25
.98
19
.75
13
.51 8,7
.34
ø4,5
.18
mm
inch
