Kestrel 5400 Heat Stress Tracker


Models & SKUs:

(Tripods sold separately)
• Kestrel 5400 Heat Stress (Orange): 0854ORA $479
• Kestrel 5400 Heat Stress + Vane Mount (Orange): 0854VORA $529
• Kestrel 5400 Heat Stress + Vane Mount (Tan): 0854VTAN $529
• Kestrel 5400 Heat Stress Pro with Compass and LiNK + Vane Mount (Orange): 0854LVCORA $599
• Kestrel 5400 Heat Stress Pro with Compass and LiNK + Vane Mount (TAN): 0854LVCTAN $599

How Does the Kestrel 5400 Work?

The Kestrel 5400 uses a 1-inch black globe to gather information about the environment, which isn’t possible with current Kestrels. As is true with the original Wet Bulb Globe Temperature apparatus, a temperature sensor is installed inside the globe that will measure the temperature inside. The temperature inside the globe is a function of the ambient air temperature, solar insolation and wind speed.
As one can imagine, a sunny day will make the globe hotter because it’s painted black, and colder ambient temperatures will have a tendency to cool off the globe. Lastly, the wind will cause the globe to get closer to the ambient air temperature because it will carry heat away from the globe when the air is cooler, or increase heat transfer to the globe if the air is warmer than the globe.
The Kestrel must sit out for a period of time to allow the globe to adjust to true atmospheric conditions; we recommend a minimum of 7-10 minutes. The globe temperature is then taken into account along with other measurements, such as ambient temperature, humidity and pressure, to calculate more meaningful measurements, such as Wet Bulb Globe Temperature and Thermal Work Limit.

PDF Download : Kestrel 5400