Hazardous Location & Pneumatic Switches
Galvanic Isolator
Specifications
EN50020-EN50039, FM3610, CSA22.2
No.157, UL913
Approvals
FM, CSA, UL, CENELEC (PTB)
approved and CE marked for all
applicable directives
Power Supply
32mA @ 18-35V DC
Number of Inputs
2
Signal Range
8V @ 8.2mA
Input Switching Current
On > 2.1mA
Off < 1.2mA
Input Resistance
1000 ohms
Isolation Protection
1500V
Output
2 x SPST
Output Contact Rating
2A/250V AC, 2A/120V AC, 2A/24V DC
Switching Frequency
15Hz
Switch Delay
On to Off 15ms
Off to On 15ms
Indication LEDs
Green = Power
Yellow = Output Closed
Red = Wire Break/Short
Operating Temperature
-20°C to +65°C (-4°F to +149°F)
Humidity
95% RH
Housing Material
Polyamide 6GF
Enclosure Protection
IP30
Mounting
35mm Din rail
Conductor Size
0.2-2.5mm
2
(24-14AWG)
Weight
Mechanical Contact Life
120g (0.26lbs)
20,000,000 cycles
Standards
APPROVED
Description
The galvanic isolators are active protective interface assemblies to
isolate intrinsically safe circuits from non intrinsically safe circuits to
worldwide standards. Galvanic isolators offer economical solutions
for instrumentation and control systems in hazardous locations.
Unlike zener diode barriers, galvanic isolators do not require
grounding.
Allen-Bradley’s galvanic isolators provide 1500 volt isolation
between hazardous area and non hazardous area terminals and 500
volt isolation between input/output and external power terminals.
DIP switches provide convenient programming for output or
diagnostic functions. Multiple LEDs allow easy visual indication of
module and circuit status.
Wiring for intrinsically safe systems must be identified as such
through the use of light blue jacketing and/or through appropriate
labels. Such labels are required by NEC Article 504 and ANSI/ISA
RP-12.6 to be placed at no more than 25 foot intervals. When
installing intrinsically safe equipment the user should refer to all
relevant national standards and/or those standards set forth by the
“authority having jurisdiction” at the installation site.
Entity Table
Groups
A, B
C, D, E,F, G
Voc
10.6V
Isc
29.7mA
Ca
2.5uF
15uF
La
40mH
150mH
Features
•
•
•
•
•
•
Galvanic isolation input-to-output
Reverse polarity protected
500V isolation between input and output
No separate intrinsically safe grounding required
18mm (0.71in) wide housing
35mm Din rail mount
16-6
Hazardous Location & Pneumatic Switches
Galvanic Isolator
Product Selection
Product
Galvanic Isolator
External Power
32mA @ 18-35VDC
Output type
SPST 2A @ 250V AC
Catalog Number
897H-G231
Approximate Dimensions—mm (inches) Block Diagram
18 (0.71)
114 (4.5)
+ -
7
9
8
1
5
2
3
80
(3.15)
DIP Switch
Settings
1234
1111
Typical Wiring Diagrams
Hazardous Location
U.S.
Class I, II, III, Div 1, 2
European
Zone 0, 1, 2, EExia IIB
See Entity Parameters
for 897H for Groups
Bulletin
800E
Latching
E-stop
Galvanic
Isolator
897H-G231
L+
Stop
Non hazardous
Location
24V DC
K1 (Aux)
Start
K2 (Aux)
L1 L2 L3
Reset
440K Tongue Interlock
1
5
2
3
A1
Input
13 23 33
MC
7
9
8
6.8K Resistors
1492-WD4RA682
Open
DIP Switch
Settings
1234
1 1 1 1 L-
Minotaur
Dual Channel
Safety Relay
K1
K2
A2
Input
14 24 34
MC
Safety Gate
K1
K1
Ground
M
440F MatGuard
Pressure Sensitive Safety Mat
7
9
6.8K Resistor
1492-WD4RA682
440F GuardEdge
Pressure Sensitive Sensing Edge
7
9
8
8
16-7
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