I did some very simple tests on a stainless steel BrewBuilt fermenter.
I closed the fermenter lid and all the ports and butterfly valve. The BLE signal was -71dB
I then used this product on a single 1.5"TC port on the lid:
For all you hop bongers out there. We have an end cap for all end caps! The Polyketone 2 Inch Tri-Clover x PCO1881 Male Thread (PET drink bottle thread like a Schweppes / Coca Cola bottle)Perfect to use along side our 2
With this attached the BLE signal was averaging -68dB. A small difference but still noticeable. The 1.5" port is quite small.
I then got a round piece of plastic the same size as the 4" TC lid and covered the whole lid hole and the BLE signal improved to -61dB.
These tests were done with my mobile phone and averaging the readings over about 1min and trying to to moving anything else when doing the comparison.
Based on this I would say it's fair to say switching over to plastic does seem to make a substantial difference on this basic testing. I think we might need to make a 4" TC lid that looks like this one:
Upgrade your FermZilla All Rounder or Tri-Conical with the new 2 Inch Tri-Clover Lid from KegLand. Add yeast, hops or even take samples from a wine thief from the top and not have to remove the entire lid.This particular lid was designed in order to suit a growing number of customers dry hop...
But is compatible with 4" TC fittings so it suits the wide range of fermenters with 4" TC at the top. What do you guys think?