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WetBulb Globe Temperature (WBGT)
7
Measurements
The QUESTemp 48N data logging, with an event logging mode, heat stress
monitor directly senses three parameters: dry bulb temperature (DB), globe
temperature (G), and relative humidity (RH).
It computes the Wet Bulb (WB), the Wet Bulb Globe Temperature (WBGT), and the
Stay Times Indices for ACGIH, U.S. Navy PHEL charts, and Flag Conditions for U.S.
Navy/Marine Corp. Ashore.
WetBulb Globe Temperature (WBGT)
The WBGT is a type of temperature index which combines the effects of
temperature, humidity, radiant heat, and air flow and provides a relatively simplistic
tool to analyze thermal comfort. The resulting WBGT values can then be compared
to indices of work-rest regimens (stay times) based upon workloads.
The WBGT calculation is a weighted average of the three temperature sensors using
the following formulas:
Stay Times/Rest Times (Indicies)
Stay Times Indices represent how long a worker should be able to safely work
under heat stress conditions. Select one of four indices for displaying and
printing from the unit: ACGIH Stay Times, NAVY PHEL’s, or Flag Conditions for
U.S. Navy/Marine Corp. Ashore. Refer to Appendix B for more information on
the indices. NOTE: it will appear as “Index” on the measurement screen.
Remote measurements
The top sensor bar may be removed from the instrument and used through a
remote cable. (Please refer to Appendix C for remote cable options.) Shelter
the instrument and remote the sensor bar if the measured environment is
expecting heavy rain or if temperatures are above 60C.
**NOTE: Navy and Marine calculations are all based on the outdoor computation.
WBGT (outdoor) = 0.7WB + 0.2G + 0.1DB (denoted as “WBGT” on the display)
Measurements