Sub MkIIIF
User Manual
Int. Approved
Document ref: ASF3-800-08
November 2018
Page 43 of 79
Copyright © 2009 Analox Ltd. All Rights Reserved.
Commercial in Confidence
7.4.1
List of Alarm Conditions
The Table below provides details of all of the usual alarm conditions annunciated by the system
(not all will be present on a particular system).
ALARM NAME
CONDITION CAUSING ALARM
Oxygen Low
Oxygen content is less than the low alarm set-point
Oxygen High
Oxygen content is greater than the high alarm set-point
Carbon Dioxide High
CO2 content is greater than the high alarm set-point
Carbon Dioxide Very
High
CO2 content is greater than the very high (HI HI) alarm set-point
Depth Low
Depth is less than the low alarm set-point
Depth High
Depth is greater than the high alarm set-point
Temperature Low
Temperature is less than the low alarm set-point
Temperature High
Temperature is greater than the high alarm set-point
Humidity Low
Humidity is less than the low alarm set-point
Humidity High
Humidity is greater than the high alarm set-point
Whenever any of these alarm conditions are recognised, the appropriate reading on the display is
highlighted on a Black background (reverse video). The corresponding Remote Display will flash.
Hysteresis is applied to each of the alarm thresholds. The hysteresis band is usually configured to
2% of the alarm set-point. Thus if a low oxygen alarm set-point is set at 180mBar, the alarm will
be raised when the oxygen level falls below 180mBar oxygen, and the alarm will be cleared when
the oxygen level rises to 180mBar 2% (=183.6mBar oxygen).
Similarly if a high oxygen alarm set-point is set at 230mBar, the alarm will be raised when the
oxygen level rises above 230mBar, and the alarm will be cleared when the oxygen level falls to
230mBar oxygen -2% (=225.4mBar oxygen).
7.4.1.1
CO2 Alarm Option
A configurable option exists for customers who measure CO2 in either % or ppm units to treat the
alarm set-points as a %SEV or ppmSEV setting.
The alarm set-point
is internally corrected with depth according to the calculation ‘ppm
Set-point /
Absolute Pressure Bars’, or ‘%
Set-point
/ Absolute Pressure Bars’. Thus an alarm level of 5000 ppm
becomes 2500ppm at 2BarAbs, and 500ppm at 10BarAbs. The following table shows the effective
alarm operating point for a set-point of 5000ppm SEV.
Please contact Analox to enable this option.
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