I've been working towards bringing our entire network of flow sensors to the 'standard' builds, & sensors but that means that there are always a few 'stragglers' from the the early generations to deal with that use different sensors, or have different internal configurations. Instead of retiring them, we simply move them out to more unusual deployments:

Field Report 2016-03-25: Monitoring in Coastal Mangroves

These units ended up being deployed upside down, as the salt->fresh water transition and the internal battery position changed the buoyancy enough that they did not float properly in their normal orientation. I should be able to sort the signs in post, provided that the units are still there a few months from now. The flat end surface is probably going to give us allot more bluff body vortex shedding in these high velocity flows....