6 .6
Interfaces for use with conventional fire and smoke detectors located in hazardous areas.
6 .6 .1
Two channel
The MTL5561 is a loop-powered 2–channel interface for use with conventional fire and
smoke detectors located in hazardous areas. In operation, the triggering of a detector causes
a corresponding change in the safe–area current. The unit features reverse input polarity
protection.
MTL5561
Figure 6 .27:
Top label
for MTL5561
48
Fire and Smoke Interface modules
MTL5561 - Fire and Smoke Detector Interface
Hazardous area
Ch 2
+
–
Fire
detectors
+
–
Ch 1
Terminal
Function
1
Output –ve (Ch 1)
2
Output +ve (Ch 1)
4
Output –ve (Ch 2)
5
Output +ve (Ch 2)
8
Input –ve (Ch 2)
9
Input +ve (Ch 2)
11
Input –ve (Ch 1)
12
Input +ve (Ch 1)
Safe area
6
7
I
5
8
4
I
9
10
3
I
11
2
12
I
1
13
14
–
Ch 2
+
–
Ch 1
+
INM 5500 Rev 10