The Kestrel 4300 Construction Weather Tracker has been developed in conjunction with construction industry experts to provide a specialised Kestrel instrument for construction professionals who lay concrete.

The new Kestrel 4300 measures and displays evaporation rate in addition to other environmental conditions. The user simply enters the concrete temperature (obtained via an IR or probe thermometer *) and the evaporation rate is instantly calculated and displayed.

The 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.

Ideal for construction workers and engineers, the Kestrel 4300 also offers a multitude of features to help you monitor your environment in one single instrument. At the touch of a button important weather information is clearly shown in digital or graphical form.

Individual functions can be displayed in 3 different formats: current, minimum/maximum/average and chart. There are also 3 user screens, which can be customised to simultaneously display the 3 most appropriate functions for the application.

The Kestrel 4300 can be set up to log data automatically (as well as manually) at programmable intervals, in order to display a history of weather information. Graphs display up to 3200 data points and the value, time and date of capture point can be shown.

The stored data can also be uploaded to a PC, for analysis/storage with the optional Kestrel Interface and Communicator software. With the Bluetooth® model, data may be streamed live via Bluetooth wireless technology.

High precision Zytel® bearings and a lightweight impeller provide accurate air flow measurements (+/-3% of reading) and the ability to operate at speeds as low as 0.6 m/s. The impeller is user-replaceable in case of damage, also ensuring high accuracy levels are maintained for life. An integral hard cover protects the impeller when not in use.

A precision external thermistor sensor provides fast response temperature readings and accuracy of +/- 1°C. The 0.1 degree resolution of the display aids in determining when a consistent reading has been reached. A special housing protects the relative humidity sensor from contamination providing an accuracy of +/-3%. A monolithic silicon based pressure sensor enables barometric pressure and altitude to be calculated, with a resolution of 0.1mb and 1m respectively.

The combination of the Kestrel 4300 Construction Weather Tracker’s multiple sensors result in the following derived functions: wind chill, heat index, dew point, wet bulb temperature, evaporation rate and density altitude.

The Kestrel 4300 is powered by two easily replaceable, AAA batteries and has two power saving modes to prolong battery life. All text can be displayed in one of several languages including: English, French, Italian, Spanish or German.

* IR or probe thermometer not included. 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, and position the unit facing into the wind, 50cm 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.

Kestrel 4300 measures

• Current wind speed
• Average wind speed
• Maximum wind speed
• Temperature
• Wind Chill
• Relative Humidity
• Heat index
• Dew Point
• Wet bulb temperature
• Evaporation rate
• Barometric pressure
• Altitude
• Density altitude
• Time & Date

Choice of measurement units

• kt, m/s, km/h, mph, ft/min, Beaufort
• ºC, ºF
• %
• mbar, inHg, hPa, psi
• m, ft

Accuracy

• Speed ±3% of reading or ±0.1m/s
• Temperature ±1ºC
• Relative humidity ±3%
• Dew point ±3ºC
• Barometric pressure ±3mbar

Operational Range

• Speed 0.6 to 60 m/s
• Temperature -45 to 125ºC
• Relative humidity 0 to 100%
• Barometric pressure 300 to 1100mbar

Specification Range

• Speed 0.6 to 40 m/s
• Temperature -29 to 70ºC
• Relative humidity 5 to 95%
• Barometric pressure 750 to 1100mbar

Available options:

• Bluetooth model

Kestrel 4300 features: What makes a Kestrel Unique?

• Multifunction instrument
• Graphical displays
• Data capture up to 3200 readings
• Minimum/maximum values
• User defined screens
• Language selection
• Small robust design
• High accuracy
• High precision axle and low-friction Zytel® bearings
• Fast response temperature sensor
• Replaceable impeller
• Easy to read back-lit display
• Hard cover protects impeller
• Runs from 2 AAA batteries
• Data upload (with optional PC interface or integrated Bluetooth wireless technology)
• Available in lime green
• 5 year warranty

Typical applications

• Construction – laying of concrete