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CHAPTER 3 CONTROLS AND FACILITIES
MAN0443.P65 Issue 13 Aug 04
5701 Control System
05701-M-5001 A02279
e.
LTEL Alarm (Long Term Exposure Limit).
The LTEL alarm will be activated when the time weighted average
concentration of a toxic gas, usually averaged over 8 hours, crosses
a preconfigured threshold. When active LTEL will be shown on the
message display of the control card. For certain relay cards and
configurations, the alarm LED associated during setup to the LTEL
alarm will be illuminated.
f.
Rate Alarm (Version 2V
x
Software only)
The rate alarm predicts the future gas concentration by monitoring the
rate of rise of the sensor signal and provides an early alarm indication
before the sensor signal reaches the next level alarm set point.
g.
Individual Alarm
An individual alarm is caused by the input to an individual control
channel crossing a preconfigured threshold and is not related to any
other control channel. The relevant LED (A1, A2, A3, Fault, Inhibit) will
illuminate on the control card with the alarm condition.
CAUTION*
Depending upon the configuration, control cards configured for Zoned,
Master or Voted alarms may not give individual alarm outputs.
h.
Zoned Alarm*
A zoned alarm is caused by the input to any control channel, from a
sensor in a designated area, crossing a preconfigured threshold. The
relevant LED (A1, A2, A3, Fault, Inhibit) will illuminate on the control
card with the alarm condition and also on the control card designated
the Zone Master Card (unless it is fitted with a High Integrity Relay
Card).
i.
Master Alarm*
A master alarm is caused by the input to any designated control
channel within a single rack crossing a preconfigured threshold. The
relevant LED (A1, A2, A3, Fault, Inhibit) will illuminate on the control
card with the alarm condition and also on the control card designated
the Master Card (unless it is fitted with a High Integrity Relay Card).
