Operation
Dräger Polytron 5100
17
4.3.6
A2 set
Configuring the A2 alarm level set point.
Holding the magnet on an arrow will begin automatically
changing the value without requiring additional taps.
The lowest alarm threshold is one display unit of gas
depending on the configured sensor type.
Alarm hierarchy:
A2 overrides A1 on the LED and display. However, the A1 and
A2 relays operate independently. I.e. if A1 is acknowledgeable,
A2 is not~, and the gas concentration is such that it triggers A1
and A2: Acknowledging will cause the A1 relay to release.
However, the red LED will still double blink as long as the A2
condition continues to exists.
Alarm hysteresis:
In order to avoid chatter at an alarm threshold, a threshold of
6% of FSD or Full Scale Deflection must be programmed. Any
alarm threshold setting less than 6% FSD is not supported and
will violate the hysteresis window preventing the instrument
from exiting the alarm state. A fixed hysteresis of 5% of full
scale is programmed.
4.3.7
A1 rising / falling
Configuring whether the alarm should be triggered by a rising
or falling gas concentration.
4.3.8
A2 rising / falling
Configuring whether the alarm should be triggered by a rising
or falling gas concentration.
4.3.9
A1 latching
Configuring the A1 alarm level to status latching or
non-latching.
Latching means that once the alarm level is reached, the
instrument will trigger the alarm. It will remain in alarm status
even if the gas concentration subsequently does not meet the
alarm condition any more. To clear a latching alarm it has to be
acknowledged with [OK].
In non-latching mode, the alarm status clears if the gas
concentration does not meet the alarm condition anymore.
4.3.10 A2 latching
Configuring the high level A2 alarm status to latching or non-
latching.
4.3.11 A1 acknowledgeable
Configuring the A1 alarm as acknowledgeable or non-
acknowledgeable.
Acknowledgeable means that the alarm relay can be reset
before alarm condition clears.
Non-acknowledgeable means that the alarm relay can not be
reset until the alarm condition clears.
4.3.12 A2 acknowledgeable
Configuring the A2 alarm as acknowledgeable or
non-acknowledgeable.
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