Fireye NEXUS NX6100 series, Manual

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Options 38.1 to 38.4 - Oxygen low alarm values at low fire (0.0 – 99.9%) LV3
Options 39.1 to 39.4 - Oxygen low alarm values at high fire (0.0 – 99.9%) LV3
Options 40.1 to 40.4 - Oxygen high alarm values at low fire (0.0 – 99.9%) LV3
Options 41.1 to 41.4 - Oxygen high alarm values at high fire (0.0 – 99.9%) LV3
Using option parameters 38.1 to 41.4, it is possible to set different oxygen alarm values at high fire and
low fire for each profile.
At firing positions other than high and low fire, the alarm limit is interpolated between the two points. For
example, if the oxygen limit has been entered as 5% of set point at low fire and 10% of set point at high
fire, the limit at mid fire will be 7.5%.
The alarm limits may set to any value between 0.0 and 99.9% , where the value entered relates to a
percentage deviation from each oxygen set point in the firing range.
If the burner is firing, it is only possible to make an adjustment to the option parameters that relate to the
selected profile. If the burner is not firing, the alarm values for any profile selection may be adjusted.
An oxygen low alarm will be caused by one or more of the following events:

The level drops below 0.5% O2 for 30 seconds

The level drops below the low alarm limit for 2 minutes

The level drops below twice the low alarm limit for 30 seconds
An oxygen high alarm will be caused by one or more of the following events:

The level rises above the high alarm limit for 2 minutes

The level rises above twice the high alarm limit for 30 seconds
When 2 probes are used the low alarm will also be caused by the following event:

The difference between the oxygen values exceeds the value set in option parameter 42.4 for two (2)
minutes.
O 2
O 2
O 2
O 2