Kestrel 4600 Heat Stress Meter - Manual (Page 6)

11 10
Measuring
The unit will calculate and display Wet Bulb Globe Temperature based on Globe
Temperature, Relative Humidity, Ambient Temperature, Barometric Pressure,
and Wind Speed.
WBGT in F
73.2
settings
To Change WBGT settings:
• Press while on the Wet Bulb Globe Temperature screen.
• Use or to change the “Type” setting between outdoor and indoor, (see glossary for
more info).
• Use to scroll to “App”, then use or to change the Application.
• Press to exit the WBGT settings screen.
Note: Warning zones for WBGT are listed in figure 1 (page 12). If red or black warnings are displayed, the
number will flash to alert the user with the screen name contrast inverting. Unless the screen says “None”,
the flag color will flash. See below screenshots for examples of inverting screen contrast. For information on
work/rest ratios and water consumption, refer to Figure 1.
MEASURING HEAT STRESS
WET BULB GLOBE TEMPERATURE
The Kestrel Heat Stress Trackers will only yield accurate measurements using the
following guidelines. It is important that the meter be fully acclimated to the
measurement environment for accurate readings.
Proper Placement
The Kestrel Heat Stress Trackers should always be used at least 3 feet from the ground. If the unit is laid
on the ground, it will compromise the measurements of user’s conditions. To ensure proper placement,
use the Kestrel Vane Mount (included) and Compact Collapsible Tripod.
Optimal Acclimating Time
If taken from a cool environment, where the Kestrel Heat Stress Tracker was stored, to an outside heat
stress climate, the unit will need to adjust accordingly. Give the unit a minimum of 7 minutes to adjust
to the outside climate if taken from storage (examples: air conditioned building, car glove box, truck
gearbox, etc). 10 minutes of acclimation time is recommended. If worn on the person without the Black
Globe exposed, the meter will need at least 2 minutes to display accurate measurements (examples:
jeans pocket, shirt pocket, etc).
Repeat Measurements
When transporting the unit with the intention of taking repeat measurements, such as on a hike
or march, try to keep the unit exposed as much as possible. A Kestrel Belt-Clip Carry Pouch or
MOLLE-Compatible Tactical Carry Pouch is ideal for this purpose as the Black Globe sensor remains
exposed to the air.
Note: Please read the cautions and warnings on page 2 of the manual carefully. Consider all relevant
factors, such as amount of work being completed, distance traveled with respect to people or animals, or
clothing worn when making judgments on heat stress.
WBGT in F
86.2
Warning: Black
settings
WBGT in F
Warning: Black
settings
86.2
Figure 1
Figure 2
SIX USER-SETTABLE WARNING ZONES
The Kestrel Heat Stress Trackers allow you to customize the settings of your heat-related
warning zones based on your specific needs.
ES
SET OUTDOOR/INDOOR MODE AND TURN ON THE WARNING ZONES
• Navigate to the WBGT Screen.
• Press to enter the Settings Screen.
• Use or to change the “Type” setting between outdoor and indoor.
• Use to highlight “Warnings,” then use or to turn on or off.
TO SET WBGT WARNING ZONES
• Press while on the WBGT Screen.
• Use to highlight “Warning setup” and press .
• Use or to scroll to different warnings zones identified by color names.
• Press to enter the selected warning zone.
• On the selected warning zone screen, press to turn the “Warning” on or off.
• Press to highlight “Temp.” Use or to adjust the temperature value. Refer to the
“WBGT Reference Guidelines” on the reverse side of this insert for suggested settings.
No risk
Low risk
Moderate risk
Moderate risk
High risk
Extreme risk
Your Kestrel Heat Stress Tracker allows you to activate and set up
to six customized heat stress warning zone thresholds to trigger
warnings identified by color names on screen. The warnings
are in increasing order of severity of risk of heat injury as shown.
When a warning zone is turned “On,” the WBGT screen will display the appropriate
warning color (i.e. Warning: White) related to the specified temperature.
Note: The Red Warning Zone is further identified by a reverse flash of the warning. The Black Warning
Zone will reverse flash the WBGT value to alert the user. See below screenshots for examples of the screen
reverse flash.
WARNING
The following WBGT Reference Guidance Charts are summarized from well-regarded
published papers, policies and position statements relating to preventing heat injury.
These guidelines are provided for reference only and do not constitute medical advice.
These guidelines, and your Kestrel Heat Stress Tracker, must be employed with care and
good judgment. Please remember that certain individuals are more susceptible to
exertional heat stress and the Kestrel Heat Stress Trackers are environmental meters,
not medical devices. For more information on heat stress injury prevention, visit
HeatStress.com.
When in doubt, set your Zone Thresholds lower, reduce work time and increase rest
and hydration.
Figure 3