Property Configuration
Out of range values -
Interpret High and
Interpret Low.
Each option can be set to Info, Inhibit or Fault. They specify
how the system should respond to values that are under-range
and over-range, respectively. The low region is 1 to 3 mA and
the high region are 21.5-24.5 mA.
Info
If Interpret High is set to Info, the display shows “Hi” and the
nominal gas level is treated as full scale.
If Interpret Low is set to Info, the display shows “Lo” and the
nominal gas level is treated as zero.
No fault is indicated. The Hi and Lo flags can be used for voting
in the relay logic.
Inhibit
If Interpret High is set to Inhibit, the display shows “In” and the
nominal gas level is treated as full scale.
If Interpret Low is set to Inhibit, the display shows “In” and the
nominal gas level is treated as zero.
The Inhibit signal for this channel can be used for voting in the
relay logic.
Fault
If either region is set to Fault then the under-range or over-range
fault is generated for the channel. This is intended to catch
short-circuit faults (High) and open-circuit faults (Low).
Alarm Levels 1, 2 and
3
The alarm thresholds must be set within the range for the
detector, using the units specified. The alarm level must be set to
either Rising or Falling. The resolution of the Alarm Levels is
the same as that of the Vortex system.
It is not necessary for Alarm 1 to be the lowest and Alarm 3 to
be the highest. Alarm 3 is not indicated and does not cause the
sounder to operate.
Zero Suppression On/Off. The default is On. When this option is selected, the
readings less than 3% of full scale are suppressed to zero.
Fire detectors
Current thresholds The current thresholds must be set within the range 0 to 60mA,
in the order
Open Circuit < Fire < Short Circuit
Reset Time Between 0 and 255 seconds. The time that the loop current is
removed to reset a latched fire detector on pressing
ACCEPT/RESET after a fire alarm.
Stabilisation Time Between 0 and 255 seconds. The time allowed for the fire
detector to stabilise after a reset before coming on line.
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