ANALOX Sub Mk III F, User Manual

Page: 42 / 79

Sub MkIIIF
User Manual
Int. Approved
Document ref: ASF3-800-08 November 2018 Page 42 of 79
Copyright © 2009 Analox Ltd. All Rights Reserved.
Commercial in Confidence
7.4 Alarm System
The primary alarm conditions monitored by the system are the oxygen, carbon dioxide, pressure
(or depth), temperature and humidity alarms. These conditions are referred to as Alarms in the
system.
The design of the system is such that in trying to gather the correct information, various faults
that may occur can be detected. These conditions are referred to as Faults in the system.
Both Alarms and Faults cause the Audible Sounder to pulse.
An Alarm condition occurring causes the ‘ALARM’ Indicato r on the Operator Console to flash.
A Fault condition occurring causes the ‘FAULT’ Indicator on the Operator Console to flash.
The Acknowledge switch on the Operator Console may be pressed to silence the audible sounder.
It will also cause the Fault and/or Alarm Indicators to stop flashing. If the alarm or fault condition
still exists, the Alarm or Fault indicator will remain turned on.
When the Alarm or Fault condition ceases to exist, the alarm or fault indicators will be turned off
and then remain turned off.
The system can be user-configured to work in latched or non-latched alarm mode.
In non-latched mode, if an alarm or fault condition occurs, but then ceases to exist, then the
Audible sounder will silence and the indicators will turn off without the Acknowledge switch having
been pressed.
In latched mode, the user must press the acknowledge switch to acknowledge that an alarm has
occurred. Only then, can the alarm indicators be turned off if the alarm condition no longer exists.
Alarm and Fault conditions are generally originated at the remote sensor modules. LED indicators
on the remote are controlled according to these conditions. An internal buzzer is also available,
which can be enabled from the Operator Console). By default, these are turned off, so as not to
raise anxiety amongst chamber occupants. Status is then transferred to the Operator Console,
which in turn will provide audible and visual indications. An operator may then acknowledge the
alarm at the Operator Console. This status is transferred back to the Remote Sensor to
acknowledge the condition at the Remote Sensor.
A few fault conditions originate at the Operator Console (eg REM COMMS TIMEOUT, which
indicates loss of communications with remote sensor. These alarms/faults are not transferred to
the Remote sensor.