@lee this is the thread @RyanAtSense is referring to I believe
Regarding your other query … interesting! I see they were acquired by a much larger maintenance group.
More on the commercial side, I have used Monnit’s sensors to achieve similar things (leak detection; over-pressure; over/under-temp; high humidity etc … along with over-current; vibration and so on). They have been around a while and their products are quite “mature” at this point. They have saved my clients a lot, especially when you account for reduced insurance premiums. Sense can now directly manage some of that (over-current for example). Integration with Sense is still a kludge but there are good redundancy reasons to keep the systems entirely discrete (again, more on the commercial side, so I’m not really answering your question).
As far as I’m aware, btw, certain manufacturers of larger systems (Daikin, Mitsubishi [CityMulti] ) have directly accessible sensors that, if one “subscribes”, can be used for maintenance alerting. It’s easy to imagine that with the ubiquity and lowering costs of IoT & sensors that this will filter down to even the smallest systems … and fairly quickly.