ADM, HBOT & Sub Aspida
User Manual Int. Approved
Document ref: PSA-811-14 June 2017 Page 19 of 43
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Commercial in Confidence
5.10 Global alarm options
There are three configurable options which affect all of the Analox Aspida's alarms. Muting, latching
and quiet options are set using the Aspida configuration software. See the Aspida configuration
software manual for instructions.
5.11 Alarm latching
Sometimes it is useful for a user to be alerted to a harmful gas level, even after the level of gas has
dropped to a safe level. The Analox Aspida can be configured to use latching alarms so that alarms
triggered by harmful gas levels will not be missed. The latching alarms option can be enabled using the
Aspida configuration software.
If the device is configured to use latching alarms then any alarm that is triggered will remain active until
it is acknowledged by pressing the button.
Example
If a high-going alarm is activated by an increasing level of gas, the alarm will continue to sound
even after the gas level has dropped below the alarm set-point. The alarm can be
acknowledged by pressing the button when the gas reading has fallen below the set-
point.
In the case of multiple alarms, the highest priority alarm that was triggered will be latched. If
the priority 1 alarm is latched and the gas level drops below the priority 1 set-point, pressing
the button will clear the priority 1 alarm, however, if the gas level is still sufficient to trigger
the priority 2 alarm, the device will continue to alarm at a priority 2 level.
5.12 Alarm muting
Sometimes it is desirable to be able to mute the horn or stop the device vibrating when an alarm is
triggered. The Analox Aspida provides an option to allow alarms to be muted. The mutable alarms
option can be set using the Aspida configuration software.
If the alarm muting option is set on the device, any active alarm can be silenced by pressing the
button whilst in an alarm state. Pressing will deactivate the horn and the vibration. The red
indicators and the on-screen warning will continue to flash until the alarm condition is cleared by safe
levels of gas. In the case where a lower priority alarm has been muted and a higher priority alarm is
triggered, the alarms will be un-muted.
Example
If a priority 2 alarm is activated and muted and the detected gas level changes so as to activate
a priority 1 alarm, the horn and vibration will re-activate to warn the user of the increased
severity. A muted alarm will not be un-muted in the case where the alarm level drops to a
lower priority.
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