How does the Kestrel 4300 automatically measure evaporation rate?
The user simply measures the concrete temperature via IR or a probe thermometer and enters the concrete temperature into the Kestrel. When measuring temperature, humidity and wind speed (all components of evaporation rate) it is optimal to position the Kestrel 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.
