Measurements
The WB-300 portable heat stress monitor computes the Wet Bulb Globe Temperature (WBGT).
The WBGT is an accepted measurement for determining the heat stress level imposed on an
individual in a given environment.
The WB-300 measures three parameters:
•
Ambient or dry bulb temperature (DB)
•
Natural wet bulb temperature (WB)
•
Globe temperature (G)
Wet Bulb Globe Temperature
The WBGT is a weighted average of the three temperature sensors using the following
formulas:
WBGT (indoor) = 0.7 WB + 0.3G (denoted as "WBGTi" on the display)
WBGT (outdoor) = 0.7WB + 0.2G + 0.1DB (denoted as "WBGTo" on the display)
;
NOTE:
The resulting WBGTi/WBGTo can be compared to indices of
work-rest regimens (or stay times) based upon the work loads.
Please
see Appendix B for published heat exposure tables.
Displayed Data
When powered on, the previously viewed measurement screen will be displayed. To view data
screens, press the or keys.
Data Screens
The following four screens are viewable by pressing the or keys on the WB-300.
Wet/Dry Measurement screen
Globe Measurement screen
WBGTi/WBGTo Measurement screen
Battery screen
Figure 4: Data/measurement screen examples
Measurements
4 Measurements
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