Introduction - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_2010
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 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
channel or associated sensor and is not user configurable. 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 configurable. 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 preconfigured 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 preconfigured 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.
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5704 Control System