Addressable Gas Detection System Manual
Addressable System Manual
64
Issue 2, January 2015
If the system requires a very high security level, two detectors are to be placed at
each measuring point. “Profile” and “Gas Type” have to be identical. The two
detectors may be of the same type or of two different types e.g. in the LEL profile a
Pellistor and an infrared (IR) detector.
Note: To use two different detection principles e.g. catalytic combustion (Pellistor)
and IR reduces significantly the risk of “common failures” related to a measuring
principle which would apply to both channels if they use the same principle.
The following items have to be identical in both channels:
a)
Profile
b)
Gas Type
c)
Measuring range
d)
Alarm set point for each alarm level
The following items may or may not be different in both channels:
a)
Detector Model
b)
Measuring principle of the detectors
c)
Response time
d)
Maintenance interval
Specifying a new redundant channel
The channel 1 of RIO 2 has been defined. After finishing the configuration of the
channel the TAB “Redundancy” is chosen. Because actually no redundant channel is
specified the information within the TAB is empty (see left bottom corner of the Fig.
4.5.5 f above).
After touching the button “Add Redundant Channel” the right screen occurs.
Fig. 4.5.5 g) List for choosing the redundant channel
