At the GROW Champions conference over last weekend, Anett (whose work somehow involves research and testing of these solutions, i gather) shared the names of some spray-on or paint-on products proven to be more or less effective at repelling wild animals (e.g. deer, boar, etc.). Such products might be expected to repel grazers as well (e.g. sheep, cattle), though we can't really know about this until we try.
So: given the list i transcribed from what she said, my Google searches turned up 3 commercial products that one can purchase online, namely:
Beyond such commercial solutions, Anett also suggested that a DIY approach utilizing old clothes and/or human urine could work as well, which i am certainly game to try (tho it may take a good few bladders-full to cover all those sensors :-)
NB: Clearly none of the above is any protection against damage by machines, and -whereas most of our pastures are impacted not only by animals but also machines at certain times- i think the most practical solution in such cases will be temporary removal of the sensors. Minimizing the time offline will involve active management, obviously -times of removal and replacement to be noted in management module of the GROW app, when it comes- and to ensure accuracy of replacement, we will mark the spot with a biodegradable paint. I have a fluorescent orange tempera (bought it for cheap at the local Chinese shop) that is said to be child-safe (that would mean biodegradable for sure), tho i suspect it won't stand up to any amount of rain, it should work for the few days in dry weather that would be our most common use-case.