Kestrel 4000 User Manual download pdf (Page 19)

KESTREL 4300 CONSTRUCTION WEATHER

TRACKER:

Evaporation Rate

The Kestrel 4300 will display the Evaporation Rate, as

dened in ACI 308, based on instantaneous Wind Speed,

Relative Humidity, Ambient Temperature and Concrete

Temperature readings.

Evaporation is a guide to how quickly concrete will lose

moisture in their pour location conditions.

To measure Evaporation Rate:

• First, use a separate measuring device to obtain the

Concrete Temperature.

• Use or to scroll to the Evaporation Rate screen,

then press .

• Use

to enter the Concrete Temperature you

obtained.

• Press

to exit the Setting Screen, then press

enter the Averaging Screen.

Make sure the Kestrel 4300 is shaded while it takes the

reading. Failure to shade the unit may cause inaccurate

readings that will not meet ACI 308 criteria.

• Position the Kestrel 20 inches above the concrete and

facing the wind, and press to begin readings.

• Count 6-10 seconds, then press again to stop

collection.

• The screen will display Avg/Min Evaporation Rate

readings.

• To clear data, press .

KESTREL 4400 + 4600 HEAT STRESS TRACKERS:

Measuring

The unit will calculate and display Wet Bulb Globe

Temperature based on Globe Temperature, Relative

Humidity, Ambient Temperature, Barometric Pressure

and Wind Speed.

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.

No risk

Low 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 identied by color names

on screen. The warnings are in increasing order of

severity of risk of heat injury as shown.

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 specic needs.

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Kestrel 4000 User Manual Page 19

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