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The new Kestrel 4300 Construction Weather Tracker measures and displays evaporation rate - a function of relative humidity, temperature and wind speed. Evaporation rate is a critical environmental indicator that concrete contractors use to ensure they avoid plastic shrinkage cracks in concrete installations especially concrete flatwork. Plastic shrinkage cracks occur when the surface of the concrete dries too quickly and shrinks before the bed has cured enough to resist cracking. This is especially relevant in specialty applications like decorative concrete, Ready Mix Concrete (RCM) and Tilt-up concrete.
Plastic shrinkage cracks can be prevented by properly assessing the weather and the fresh concrete conditions. Previously, construction contractors used a Kestrel Meter to measure the relevant conditions, then referenced an American Concrete Institute chart to calculate the evaporation rate. The new Kestrel 4300 Construction Weather Tracker does the work for them! The user simply enters the concrete temperature (obtained via an infrared thermometer or probe thermometer*) and the 4300 calculates the evaporation rate instantly. In addition to evaporation rate, the Kestrel 4300 remains the perfect rugged all-purpose construction weather tool, measuring and logging the following relevant weather conditions right where the workers and equipment are operating.
For maximum accuracy when measuring the evaporation rate:
Measure the concrete temperature via an infrared or probe thermometer
Enter the concrete temperature into the Kestrel
Position the unit facing into the wind, 20 inches above the concrete
Shade the Kestrel's thermistor (temperature sensor) so it is not in direct sunlight
For the best accuracy, use the Kestrel's convenient averaging mode to average the evaporation rate over the recommended 6-10 seconds.
Features:
Waterproof and floats
Backlight for low light conditions
Data logger (automatic and manual)
Customizable data storage – 1800 data points
Multi-Function 3-line display
Convenient averaging mode
Data charting
User-replaceable impeller
Flip-top impeller cover
Five languages (English, French, Spanish, German, and Italian)
Kestrel® 4300 Construction Weather Tracker