Product Description & Specifications
Improve results when doing surface coating and concrete pouring, andensure worker and equipment safety by knowing accurate local weatherconditions.
For years construction professionals have been using Kestrel Metersto monitor the weather on the job site. Now NK has partnered withindustry experts to develop a customized Kestrel instrument forconstruction professionals who place concrete.
Calculates Evaporation Rate
The new Kestrel 4300 Construction Weather Tracker measures anddisplays evaporation rate — a function of relative humidity,temperature and wind speed. Evaporation rate is a criticalenvironmental indicator that concrete contractors use to ensure theyavoid plastic shrinkage cracks in concrete installations especiallyconcrete flatwork. Plastic shrinkage cracks occur when the surface ofthe concrete dries too quickly and shrinks before the bed has curedenough to resist cracking. This is especially relevant in specialtyapplications like decorative concrete, Ready Mix Concrete (RCM) andTilt-up concrete.
Helps Prevent Plastic Shrinkage Cracks
Plastic shrinkage cracks can be prevented by properly assessing theweather and the fresh concrete conditions. Previously, constructioncontractors used a Kestrel Meter to measure the relevant conditions,then referenced an American Concrete Institute chart to calculate theevaporation rate. The new Kestrel 4300 Construction Weather Trackerdoes the work for them! The user simply enters the concrete temperature(obtained via an infrared thermometer or probe thermometer*) and the4300 calculates the evaporation rate instantly. In addition toevaporation rate, the Kestrel 4300 remains the perfect ruggedall-purpose construction weather tool, measuring and logging thefollowing relevant weather conditions right where the workers andequipment are operating.
For maximum accuracy when measuring the evaporation rate:
1. Measure the concrete temperature via an infrared or probe thermometer
2. Enter the concrete temperature into the Kestrel
3. Position the unit facing into the wind, 20 inches above the concrete
4. Shade the Kestrel's thermistor (temperature sensor) so it is not in direct sunlight
For the best accuracy, use the Kestrel's convenient averaging modeto average the evaporation rate over the recommended 6-10 seconds.
Learn More About Preventing Plastic Shrinkage Cracks. (ContentProvided by Luke Snell, Director of Concrete Industry Management, Del.E. Webb School of Construction, Arizona State University)
Documents Work Conditions
Many construction applications require documentation of conditions,which is quick and easy with the Kestrel PC Interface and accompanyingsoftware. Use the 4300's 1800 data-point log to document that work wasdone during the appropriate conditions, then upload the data to a PCwith the Kestrel PC Interface. The Kestrel Communicator software makeslong-term storage, in-depth analysis and detailed charting of storeddata a breeze.
Kestrel's Mini Tripod is a great companion for the 4300—it measures15 inches tall, positioning the Kestrel 4300 20 inches above theconcrete, which is ideal for measuring the conditions that contributeto plastic shrinkage cracks.
Every Kestrel is individually calibrated to NIST-traceable standardsand comes with a free Certificate of Conformity. Individual NISTcertificates and recalibration are also available.
Kestrel 4300 Measures
* Evaporation rate
* Relative humidity in %
* Wind speed (current, average, and maximum)
* Temperature in °F or °C
* Dewpoint
* Barometric pressure
* Heat stress index
* Wet bulb temperature
* Windchill
* Altitude
* Density altitude
Kestrel 4300 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
* Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
* User-replaceable impeller
* Flip-top impeller cover
* Upload to a computer (with optional interface)
* Five languages (English, French, Spanish, German, and Italian)
* US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
* 5-year warranty
* Assembled in the USA
Kestrel 4300 Includes
* Soft carry pouch
* Wrist and neck lanyards
* Batteries – 2 AAA
* Kestrel Certificate of Conformity
Warranty: 5 Years
