During burner operation, the O₂ actual value is constantly monitored for a maximum limit value (Alarm MAX) and two minimum limit values (Alarm MIN 1 and Alarm MIN 2).

O₂ monitoring bands

X

Load position in digits

Y

O₂ setpoint in vol%

A

O₂ setpoint

B

Alarm MAX

C

Alarm MIN 1

D

Alarm MIN 2

The limit values are specified in percent based on the current O₂ setpoint. If the O₂ setpoint

• decreases, the difference between the O₂ setpoint and the limit values decreases.

• increases, the difference between the O₂ setpoint and the limit values increases.