Honeywell 5704

3-3
MAN0448_Issue 13_2010 5704 Control System
005704-M-5001 A03249
CHAPTER 3 CONTROLS AND FACILITIES
1. INTRODUCTION
The 5704 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 condition and channel reading number.
Further information can be gathered and, depending on the security
status,certainsettingscanbeadjustedbymeansofanEngineering
Cardttedtotherack.
Therelayoutputsofthesystemarecongured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
channelorassociatedsensorandisnotusercongurable.Inaddition
the FAULT LED will be illuminated as described in Section 2.3.1a.
b. Inhibit Alarm
The inhibit alarm activates when the system alarms are inhibited for
anyreasonandisnotusercongurable.InadditiontheINHIBIT
LED will be illuminated as described in Section 2.3.1b.
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preconguredalarmthreshold.In
addition the relevant LED will be illuminated as described in Section
2.3.1c, d and e.
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 or 15 minutes,
crosses a precongured threshold. The control card alarm LED,
associated during setup to the STEL alarm, will be illuminated as
described in Section 2.3.1f and the message display will show
STEL.