I use two electronically controlled Tunze 6055 pumps in my display tank, which I control by means of a ProfiLux 3n computer 1-10V ports.
Everything works fine in what concerns the control part.
Tunze pretends these pumps have a "fish protection feature" by which when the pumps are electronically set to stall (they are still powered though) they will spin once every 20 seconds.
Well, this never happens to any of my Tunzes!!! I contacted Tunze and they gave me an unbelievably reply: due to complaints concerning the noise generated, the programming of the pumps has been changed in performing only 1/4-1/3 of a full spin at every minute (the pumps are so silent I cannot hear any noise even at full speed!). I watched the pumps for long periods of time and I never saw any propeller movement to any of them (in the above mentioned conditions). Frankly, I think the guys from Tunze are not telling the truth - I suspect they simplified the pump to reduce production costs and replaced the electronic fish protection with a plastic grid that is supplied with the pump.
But before taking any further action for misleading commercial information, I have to be sure it's not something related to the fact I'm controlling the pumps by means of a Profilux computer instead a Tunze dedicated controller.
So, here is the question: is there anyone to have observed a similar dysfunction with electronic Tunzes controlled by Profilux computers? Or reversely, if you have electronic Tunzes to provide the advertized "fish protection" function even when controlled by Profilux, how old are these pumps (when were they manufactured/bought)?
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