There are two node configurations required for the measurement of the U-Value and/or R-Value. One node is to be placed indoors (Type 1), and one node outdoors (Type 2):
uval Wireless System nodes have a battery lifetime of (at least) 2 years, and are adaptable to both Type 1 sensors, and Type 2 sensors. Any node can take any sensor combination, and still remain adaptable for other sensors.
1x combined heatflux / surface temperature sensor 1x ambient air temperature sensor
1x surface temperature sensor 1x ambient air temperature sensor
NOTE: Battery usage occurs when sensors are plugged into the node. Plug out sensors when not in use.