Level sensor reaction time won't accept >60s

Dear All,

I am using a Profilux 4 and I have a setup using level sensors for ATO. I need to set a reaction time for the level sensors of 2-3 minutes to avoid it being triggered too often. I have checked in the Profilux4 Programming Guide and it says that this can be set up until 240 seconds, however when I try to change the reaction time in the Level settings page it doesn't accept anything higher than 60 seconds.

I would greatly appreciate any help to solve this.

Thanks!