Airline length for a Tsunami AT1

Hi,

Been a while since I've posted, but I'm slowly bringing my reef back to life after a full crash and 2 years limping along on life support!

Right now I'm just trying to get the general plumbing for a sump and ATO system going before I do anything else and I was wondering if anyone here has experience using the Tsunami AT1 auto top off system.

I cut the airline tubing that came with it so that it would fit into the space better, but now it seems to be in a permanent "on" state even though the sensor is as low or lower than when I tested it prior to cutting the airline. Does the pressure sensor in the unit require an exact length of airline tubing?

Any help appreciated!

 

Bump

 

Is traffic light here these days, or is the Tsunami Auto top off not that common?