NORMAL OPERATION
Touchpoint Pro
Pt. No. 2400M2566_1_EN
43
Operating Manual
6.8.3
Special Considerations when using Catalytic Sensors
Touchpoint Pro continually carries out diagnostics to prove that the system is operating correctly and faults such as wiring
faults will clear automatically when the system detects that the fault has been corrected.
In rare circumstances (due to insufficient oxygen for the sensor to operate correctly) a high gas concentration could occur
while the system is in fault, and which may not be detected by the system due to the fault. It is therefore
highly
recommended
to configure at least one Relay Output to
latch
on fault
on channels that are used with catalytic sensors.
6.8.4
Configuration of Relay Outputs
Each output must be configured as Normally Energized, Alarm Update Enable not selected, and Latch Function selected, as
shown in the following example:
Figure 39.
Fault Latch Output Configuration
Auxiliary Output
Enable
should normally be selected if any load is connected to the module auxiliary output supplies (e.g. a
sounder or a beacon). A fault will then be generated if the output current limit is exceeded.
Each output must be configured as Output Type
Normal
, with a cause and effect matrix similar to the following example.
The cause and effect matrix must include all channels using catalytic sensors, in this instance three mV channels.
ID/Location
AL1
AL2
AL3
FLT
INH
WRN
Select All
mV Channel 1
mV Channel 2
mV Channel 3
At least One Alarm
Enabled
Vote Count
Channels Selected:
3
To allow zoning of sensors it is possible to assign as many or as few input channels to the relay output channels as required,
however it is a requirement of the
European Performance Approval
that
at least one channel is configured to latch
such a
fault.
1
