I like the device I linked to at the bottom of this post because it allows you to monitor the frequency that it runs and also use it as a makeshift water sensor:
The water sensor aspect won’t work with all sump pump configurations, but the vibration detection allows you to use CoRE to receive notifications if it’s been too long since it last ran. That way I’ll still get notified if my zwave network goes down for whatever reason because CoRE runs in the cloud.
I also have other water sensor probes hanging in the pit and I’ve never had an issue with condensation, but I recommend testing them every once in a while to make sure.