Reset Level sensor

I'm currently using Level 3 sensor in my skimmate locker
It is setup as Leakage detection (Maximum on time of 0:00:00)
This is Linked to a Programmable logic gate - Fill water 3(Inverted) Delayed Off 7200s
This means, once I Manually reset the level sensor the timer count downs to 7200s. This Programmable logic controls a peristaltic pump which empties the skimmate locker.
My skimmer is controlled by Level 3(skimmate locker level) and Level 5(inverted)(sump level).

What I want to do is - Once the level 3 sensor(skimmate locker) is triggered, I want it to automatically reset after 7200sec? But if it gets triggered again within 1800sec, I want it to be not reset! .

My idea is - my peripump would empty the skimmate locker in 2 hours, I want the skimmer to start at the end of this 2 hours. Also, want a fall back option of stopping the skimmer if the skimmate locker sensor is triggered within 30 min.