Table of Contents
MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 3 CONTROLS AND FACILITIES
1.
INTRODUCTION
The 5701 Series Control System is equipped to provide the operational
and engineering facilities necessary to fully maintain a system of gas
detection equipment.
Each control card within a rack system displays a sensor reading, alarm
status and condition of that channel.
Further information can be gathered and, depending on the security
status, certain settings can be adjusted by means of an Engineering
Card fitted to the rack.
The relay outputs of the system are configured to provide a range of
output alarm functions as follows:
a.
Fault Alarm
The fault alarm activates when a fault is detected in the control card
or associated sensor and is not user configurable. In addition the
FAULT LED will be illuminated.
b.
Inhibit Alarm
The inhibit alarm activates when the system alarms are inhibited for
any reason and is not user configurable. In addition the INHIBIT LED
will be illuminated.
c.
A1, A2 and A3 Level Alarms
The A1, A2 and A3 level alarms are activated when the level of gas
being measured crosses the preconfigured alarm threshold. In addition
the relevant LED will be illuminated.
d.
STEL Alarm (Short Term Exposure Limit)
The STEL alarm will be activated when the time weighted average
concentration of a toxic gas, usually averaged over 10, 15 or 30
minutes, crosses a preconfigured threshold. When active STEL 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 STEL alarm will be illuminated.
3 - 3
5701 Control System
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