Kentec Electronics Sigma XT+ - Intrinsically Safe Barrier Integration

Man-1112 Sigma XT+_23 Page 18 of 52
8. Using intrinsically safe barriers
SIGMA XT+ control panels support the use of I.S. barriers for connecting to equipment in hazardous areas.
Only certified detectors, call points and sounders may be used in hazardous areas and these must be
connected to the control panel via a compatible I.S. barrier as listed in table 5.
Connection of the I.S. barrier changes the characteristics of the detection circuit so zones that have I.S. barriers
connected must be adjusted to work with them.
Programmable options C61 to C68 on the detection section allow each zone to operate with I.S. barriers.
The amount of detectors and call points that can be connected to a zone is limited by the I.S. approval system
diagram which should be supplied by the detector manufacturer. The power rating of the end of line resistor will
be dependent upon the Zone classification rating (Gas class) this will be specified on the system diagram.
DETECTION
ZONE
TERMINALS
+ IN
-IN
+ OUT
-OUT
I.S.
DETECTOR
I.S. CALL
POINT
See manufacturers
details for detailed
connection information
See manufacturers
details for detailed
connection information
6K8 end of
line resistor
1
2
3
4
5
67
8
9
10
11
12
DETECTION
ZONE
TERMINALS
+ IN
-IN
+ OUT
-OUT
I.S.
DETECTOR
I.S. CALL
POINT
See manufacturers
details for detailed
connection information
See manufacturers
details for detailed
connection information
6K8 end of
line resistor
MTL5061 GALVANIC
ISOLATOR
SAFE AREA HAZARDOUS AREA
Detection zone wiring through an MTL5061 galvanic isolator
Sounder circuit wiring through an MTL7778ac I.S. barrier