SL-014 v1.6 Page27
Document Ref: SL-014 v1.6
LEVEL
TYPE
RELAY
EXIT
Once the alarm level has been set you then need to set the Alarm TYPE and decide which relay activates
once the set alarm level is breached. The following sequence continues from the previous page and
describes the set up sequences
To select an option rotate the jog
wheel and press the selection button
to select the required option
Top line indicates “select alarm type” Rotate
the jog wheel to select the desired alarm type
option. Press the selection button to select.
Rising Latching Alarm
Latching alarms
remain set until the
button is pressed to
reset the alarm. The
gas level must be
below the alarm level
threshold for the reset
to operate. This type of
alarm is typically used
in safety applications.
Where alarm is
required in response to
rising gas levels
Press and hold until
prompted to release to
select this option.
Rising Alarm
Rising alarms will
automatically reset
once the gas level falls
below the alarm
threshold. This type of
alarm is typically used
in control applications
where action is
required in response to
rising gas levels.
Press and hold until
prompted to release to
select this option.
Falling Latching Alarm
Latching alarms remain set
until the button is pressed
to reset the alarm. For a
falling alarm the gas level
must be above the alarm
level threshold for the reset
to operate. This type of
alarm is typically used in
safety applications for
Oxygen deficiency
monitoring where you are
monitoring for a falling
Oxygen level.
Press and hold until
prompted to release to
select this option.
Falling Alarm
Falling alarms will
automatically reset once
the gas level rises
above the alarm
threshold. This type of
alarm is typically used in
control applications
where action is required
in response to falling
gas level (typical in
Oxygen deficiency
applications).
Press and hold until
prompted to release to
select this option.
Rising and Falling Non Latching Alarms
Rising and Falling Latching Alarms
Alarm Set Point
Alarm Set Point
Alarm O/P On
Re-Set Input On
Alarm O/P Off
Re-Set Input Off
5% of Alarm Set Point
Alarm Activates
Alarm Activates
10 Seconds
10 Seconds
Alarm Resets
Indicates pressing the front panel ‘jog wheel’ to
cancel the alarm
Scroll to change selection
Select Alarm Type
Select Alarm Type
Select Alarm Type
Select Alarm Type
RIS LAT
RISING
FALLING
FALL LAT
If alarm devices, output contacts or alarm signal outputs are provided as part of continuous duty
gas detection equipment and are intended to operate when a potentially hazardous gas
concentration is detected, they shall be of a latching type requiring a deliberate manual action to
reset. If two or more alarm set points are provided, the lower may be non-latching - based on user
preference. Alarms shall remain in operation while the alarm condition is still present, although
audible alarms may be silenced if this audible alarm is not the only alarm.
Alarm Actions and Alarm Levels
