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Globe Thermometer
6
Sensors
Globe Thermometer
The globe thermometer (left position) gives an indication of the radiant heat
exposure on an individual due to either direct sunlight or hot objects in the
environment. This is accomplished by placing a temperature sensor inside a
blackened copper sphere and measuring the temperature rise. The WBGT index
is based on the response of a 6 inch diameter globe. The QUESTemp uses a 2
inch diameter globe for a faster response time. The temperature of the 2 inch
globe is correlated to match that of a 6 inch globe.
Waterless Wetbulb & Relative Humidity Sensor
The relative humidity sensor (middle position) is used to calculate the Waterless
Wetbulb from a combination of dry bulb temperature, humidity and wind speed
measurements. The waterless wetbulb is used to calculate an estimated WBGT
value.
Dry Bulb Thermometer
The dry bulb thermometer (right position) measures the ambient air
temperature. This measurement is used in the outdoor WBGT calculation when
a high solar radiant heat load may be present. The series of white plates
surrounding the sensor shield it from radiant heat.
Figure 1-8: Sensors identified
A. Globe thermometer
B. Relative humidity sensor
C. Dry bulb thermometer
Sensors
A
B
C