I've got most of your response figured out, thank you. couple of things, what does ISY stand for (I figured it's the hub?).
When you say the sensors have a long cycle to save battery, do you know how long the cycle is when it's not outside the alert range?
The temperature in my freezer is -18c but doesn't seem like the sensor is picking up below -8 or -9c? Mind you I just got this system up and running yesterday so still toying with it.
Thanks a bunch, this seems like a very decent forum, glad to be a part, from Northwestern Quebec.