I'd like to turn off my UV if my temp gets too high. I maintain my tank at 78 degrees, and would like to turn off the UV if the temp goes over 80. The "nominal value" (setpoint) on my temp probe is 78, and I'd like to keep it there. So how do I turn off UV if the temp exceeds a different setpoint. I think @Lasse referred to the concept of "virtual sensors"... Is that how I'd do it? I don't see how to create a virtual sensor.