9
the WBGT index at three heights corresponding to the worker's ankles,
abdomen and head and perform a weighted average on those values. It is
computed using the formula:
WBGT
w
= (WBGT
head
+ (2 x WBGT
abdomen
) + WBGT
ankles
)/4
The QUESTemp always assigns the top sensor bar the double weighting. This
calculation is shown if a WBGT display has been selected and if 3 sensor sets
are connected.
7. OPERATIONAL CHECK
A verification module, Quest model 054-544, may be used to check the operation
of the QUESTemp. Remove the top sensor bar and plug the verification module
into the top of the unit. With the QUESTemp set to read in degrees Celsius, verify
that the displayed readings match those printed on the module /-0.5
°
C.
If the readings are not within the +/-0.5
°
C tolerance, then have the unit serviced
and calibrated.
8. POWER OPTIONS
There are 3 options for powering the QUESTemp: a 9 volt alkaline battery, a
NiMH (Nickel Metal Hydride) rechargeable 6-cell battery pack, and an AC
adapter. A door on the back of the unit allows the user access to the 9 volt
battery. The rechargeable battery pack is located inside of the unit. If the
rechargeable battery pack ever needs to be replaced, it can be accessed by
removing the screws from the bottom panel of the unit.
