Heat Stress: Globe – Should I use the 6-inch or 2-inch globe?
The Globe part of the WBGT measurement calls for a 6-inch (15 cm) diameter hollow copper sphere painted matte black on the outside, or the equivalent. The standard QT-34 and QT-36 sensor bar comes with a 2-inch globe for faster response time. The temperature of the 2-inch globe is correlated to match that of a 6-inch globe. An optional sensor bar with a 6-inch globe is available, if desired, but is not necessary.
