Hello all,
I have a Ultraprobe 201 grease caddy, my question is ; can I use this to detect turbulence in a pump? and what decibel levels does turbulence occurs at?!
Thank you

You may be able to use your grease caddy to listen to the pump, depending on what contact probe options it has. The second part of your question is "what decibel levels does turbulence occur at?" I think you meant to ask what frequency does turbulence occur at, as the decibel level would refer to the ampliutude of the pump's turbulent flow.
I've detected turbulence and pump cavitation at frequencies between 35 and 40 kHz using a detector capable of digital decibel measurements. Turbulent flow and cavitation may be detectable at lower frequencies too, but remember that as you lower the frequency of your ultrasound meter you also introduce other plant noises that may be parasitic to the cavitation and turbulence you are trying to detect. That interference may be undesirable.
There may be some correlation between the grease caddy's LED bargraph and decibels, but I would question the ability of the grease caddy to trend the evolution of a cavitation problem based on counting LED's.
I hope this helps.

The easy way to identify turbulence, and in particular, cavitation with ultrasound is to listen on the bearing housing and then listen on the pump housing. If cavitation is occurring, the sound level will be distinctly higher on the impeller housing. I have not used the grease caddy but, I expect it is capable of this simple comparison. I think you would need a different instrument to make quantitative measurements of the ultrasound level for either comparison or trending purposes.