1 Introduction
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Introduction
The QUESTempº 48N offers traditional heat stress monitoring without the aggravation of
maintaining a wet bulb. Through collaboration with Professor Dr. Thomas Bernard, from the
College of Public Health at the University of South Florida, mathematical models were
implemented to create a Waterless Wet Bulb calculation through a combination of dry bulb
temperature, globe temperature, relative humidity, and air flow.
Figure 1-1: QUESTempº 48N
QUESTempº 48N Model
The QUESTempº 48N model was specifically engineered for the Department of Defense
Ashore and Afloat Operations in which conditions require hand’s free monitoring, in-the-field
user RH/WBGT sensor alignments, and snapshot measurement logging (called “event
logging mode”).
The QT48N measures and calculates the dry bulb, wet bulb, globe, WBGT outdoors, and
relative humidity with two different types of data logging modes – as a time history session or
an event logging mode.
You also have the capability to measure stay times in order to manage work/rest regimens.
Guidance is based on the screening criteria for heat stress as defined in the ACGIH TLV
Handbook, U.S. Navy PHEL charts, and Flag Conditions for U.S. Navy/Marine Corp. Ashore.
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