Intrinsic Safety Barrier
This Intrinsic Safety Barrier Module is the perfect complement
to BEI’s Intrinsically Safe Encoders and, when used together,
constitutes a completely engineered solution for encoder
operation in Class I and Class II, Division 1 (Zone 0) Hazardous
Environments. This single barrier provides both power and
signal isolation for an incremental encoder with differential
quadrature outputs and an index. This all-in-one approach
saves the cost, inconvenience and system design time needed
when using separate power and signal barriers. This barrier
is galvanically isolated which eliminates the added cost of
maintaining a high integrity earth ground. With differential line
driver outputs, this barrier can be used to carry signals reliably
up to 500 feet with a bandwidth of up to 250 kHz. It is designed
around a standard DIN Rail mounting (Type EN 50022, 35 mm
X 7.5 mm) for easy installation in standard enclosures. A length
of DIN rail is supplied with each module. The module simply
snaps directly to the DIN rail and is ready to use.
The Intrinsic Safety Barrier Module is certified to be installed in
Class I, Div. 2 (Zone 2) areas.
When properly connected, differential data signals have an
inherent immunity to noise since it is rejected as common
mode. However if a connection between the encoder and the
barrier is broken or improperly terminated it can act as an
antenna and still create a signal. An open wire detection (ISD)
option is available on BEI’s Intrinsically Safe Barriers (28V/V
and 28V/5 only). In the event that the data line is cut or not
properly connected the ISD option can detect a change in the
impedance of the connection and cause the output data on
both legs of the differential signal to go low. This creates an
erroneous logic state that can be used by the operator to halt or
modify a process.
This Intrinsic Safety Barrier has certifications
to be used as an associated apparatus for
intrinsically safe encoders installed in the
following hazardous locations:
US Class I, Group A,B,C,D;
Class II, Groups E,F,G; Class III
Canadian Class I, Zone 0, Group IIC
II 3 (1) G Ex nA [ia Ga] IIC T4 Gc
Ex nA [ia Ga] IIC T4 Gc
EN 55011 and 61000-6-2
Intrinsic Safety Barrier Ordering Options
for assistance, call 800.350.2727
Use this diagram, working from left to right to construct your model number (example: EM-DR1-IS-5-RTB-28V/V)
EM
EM = Electronic Module, DIN Rail
mount
TYPE:
DR1
IS
5
OUTPUT VOLTAGE TO
ENCODER
RTB
5=5 VDC
PACKAGE STYLE:
DR1 = 114.5 mm x 99mm x
22.5 mm
IS= Intrinsically Safe
ISD = Intrinsically Safe with
Open Wire Detection (available
with 28V/V or 28V/5 supply
voltage/output)
FUNCTION
RTB =
RemoveTerminal
Block
OUTPUT TERMINATION:
VOLTAGE/OUTPUT:
28V/V = 12-28 VDC, Vout = Vin
28V/5 = 12-28 VDC, Vout = 5 volts
28V/OC = 12-28 VDC, Vout = Open Coll.
7230 Hollister Avenue | Goleta, CA | 93117
Tel: 805.968.0782 / 800.960.2726
www.beisensors.com
These commodities, technology or software if exported from the United States must be in accordance
with the Bureau of Industry, and Security, Export Administration regulations. Diversion contrary to U.S.
law is prohibited.
Specification No.: 02125-004
Rev 2-20-14
Page 1/2
Intrinsic Safety Barrier
Specifications
POWER SUPPLY / OUTPUT TYPE
Part Number
60004-002
Barrier Supply: Vs ±5%
Vout = 5V
Output logic to Non-hazardous Area Apparatus
Line Driver
up to 100 mA source/sink
(TTL & RS422 compatible)
Line Driver
up to 100 mA source/sink
NPN
up to 80 mA sink
Line Driver
up to 100 mA source/sink
Open wire detect option
Line Driver
60004-003
60004-004
Vout = Vin
Open
Collector
Vout = 5V
12-28 VDC
60004-005
60004-006
Vout = Vin
up to 100 mA source/sink
Open wire detect option
!
Caution: Operation above or below barrier supply voltage (Vs) range noted will cause permanent damage to barrier
BARRIER PARAMETERS
Class I, Gp D
Class II, Gps E,F,G
Group IIA
Barrier Output
(Po)
870 mW
Voc (Uo)
9.48 VDC
Isc (Io)
367 mA
Ca (Co)
255 uF
La (Lo)
2.1 mH
L/R Ratio
327 uH/Ω
Class I, Gps C,D
Class II, Gps E,F,G
Group IIB
Ca (Co)
27 uF
La (Lo)
1.05 mH
L/R Ratio
160 uH/Ω
Class I, Gps A,B,C,D
Class II, Gps E,F,G
Group IIC
Ca (Co)
3.7 uF
La (Lo)
0.26 mH
L/R Ratio
40.8 uH/Ω
INPUT TO BARRIER FROM ENCODER
Signals
Input Signal Impedance
Input Signal level
A, B, Z, A/, B/, Z/ differential or A,B,Z single-ended
500 Ω nominal (A to A/, B to B/, Z to Z/)
4 VDC minimum, 6 VDC maximum
General Wiring Diagram
(See BEI Sensors drawing 08067-003 for important details)
7230 Hollister Avenue | Goleta, CA | 93117
Tel: 805.968.0782 / 800.960.2726
www.beisensors.com
These commodities, technology or software if exported from the United States must be in accordance
with the Bureau of Industry, and Security, Export Administration regulations. Diversion contrary to U.S.
law is prohibited.
Specification No.: 02125-004
Rev 2-20-14
Page 2/2
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