For years construction
professionals have been using Kestrel Meters to monitor the weather
on the job site. Now NK has partnered with industry experts to
develop a customized Kestrel instrument for construction
professionals who place concrete.
Kestrel 4300 Measures
- Evaporation rate
- Relative Humidity (in %)
- Wind Speed (current, avg., max.)
- Temp (F or C)
- Wet bulb temp
- Windchill
- Altitude
- Density Altitude
- Calculates Evaporation Rate
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.
Helps Prevent Plastic Shrinkage Cracks-
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 thermistor (temperature sensor) so it is
not in direct sunlight
(For the best accuracy, use the Kestrel convenient averaging
mode to average the evaporation rate over the recommended 6-10
seconds.)
Documents Work Conditions
Many construction applications require documentation of
conditions, which is quick and easy with the Kestrel PC Interface
and accompanying software. Use the 4300s 1800 data-point log to
document that work was done during the appropriate conditions, then
upload the data to a PC with the Kestrel PC Interface. The Kestrel
Communicator software makes long-term storage, in-depth analysis and
detailed charting of stored data a breeze.
Every Kestrel is individually calibrated to NIST-traceable
standards and comes with a free Certificate of Conformity.
Individual NIST certificates and recalibration are also available.
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
- Neck lanyard
- Batteries – 2 AAA
- Kestrel Certificate of Conformity
