60 Installation Guide
Installing relays
This is the diagram to install the communication relays between external sensors and the
CoreSense M10. These relays are underneath the terminal box (see Figure 3 on page 13). For more
information, see “Power and relays” on page 91.
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Figure 45 Relays
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Table 5 Relay behavior
Relay 1
(Maintenance)
1 if the instrument is functional (blue LED off)
0 if there is a problem with the CoreSense M10 (blue LED lit)
Relay 2
(System)
1 if no gas alarm is active (green LED it)
0 if an alarm is active (warning or alarm). (green LED off)
Relay 3
(Warning)
1 if one of the elements analyzed by CoreSense M10 is in warning (yellow LED lit)
0 if no warning on analyses (yellow LED off)
Relay 4
(Alarm)
1 if one of the elements analyzed by CoreSense M10 is in alarm(red LED lit)
0 if no alarm on analyses (red LED off)
Examples of combined relay behavior
1-1-0-0 System OK
0-0-0-0 Internal problems, and gas concentration predictions not possible
1-0-1-0 If a gas concentration is above a threshold but below an alarm
1-0-0-1 In case of excessive gas concentrations
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