Tunze 3152 additional fail safe?

[Zeal]

Recently bought a Tunze 3152 and it works perfectly fine but I'm terrified every day I leave to work it's going to fail and flood my room...

I have it placed in the return pump chamber on my Nuvo 40...

Anything I can do to make a additional fail safe?

 

[AdamNC]

The failsafe is that after 90 secs it will shut off and only reset by unplugging and plug back in. The only other fail is it stops working. 25 gallon to 50 gallon tanks, the internal jumper should be moved and I think it ups the max time to 3 mins.

 

[NY_Caveman]

Agreed. Here is the manual with the jumper information if you need it

https://www.tunze.com/fileadmin/gebrauchsanleitungen/x3152.8888.pdf

 

[NY_Caveman]

If you are really, really worried upgrade to the 3155 which has both an optical sensor and a float switch backup.

 

[Mark Bianco]

All Great advise however if the OP still wants to add an additional safety its possible and relatively easy by adding in series a second float switch. Please note this will probably void your warranty.

1. Carefully (I suggest a razor blade or an Exacto knife) remove about one inch of the insulation on the cable leading to the float switch currently installed.
2. Cut one wire it doesn't matter which wire, but only cut one!
3. Install some type of splicing connector on each end of the wire you cut. I like the ones they sell at autotopoffr.com in the miscellaneous section they are insulated and have a gel to help protect the splice.
4. Insert one wire from the new float switch into each of the splices secure and you are done.
5. When you install the second switch make sure the switch is closed when the float is in the down position.

I will post a crude over simplified diagram of how the circuit works.

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