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Track weather conditions and record trends at a burn site or from the minute you get on a fire, then export data to get crucial information where it needs to go.

Kestrel DROP D3FW Fire Weather Monitor Overview

When managing a burn site, knowing environmental conditions are within prescription is important for compliance and to ensure a fire doesn’t get out of control.  Gathering sufficient weather data from site visits to make a decision on when to burn can be challenging.  In addition to the full wind and weather readings from a Kestrel weather meter, the new Kestrel DROP data loggers can be left on site recording a history of conditions and trends which can then be viewed on a mobile device and shared via email.

Small, Accurate, Rugged and Waterproof

Each Kestrel Fire Weather DROP measures just 1 x 1.8 x 2.4 inches (24 x 46 mm x 60 mm) and weighs just 1.2 ounces (34 grams).  DROP loggers meet military and international standards for water, dust and shock resistance (IP-67 and MIL-STD-810G) and are conveniently equipped with a sturdy D-ring for hanging wherever needed.

Log, View and Share on the Kestrel LiNK App

Kestrel LiNK is the free app that powers the Fire Weather DROP data logger. With Kestrel LiNK on your smart phone or tablet, you can view real-time readings from any DROP logger within wireless range (up to 100’ or more line of sight) via Bluetooth® low energy. Min/Max/Average readings are clearly displayed and the data log is viewable as a scrolling graph with detailed data for each logged point. The Kestrel LiNK app also allows adjustment of the logging interval and other settings as well as real-time threshold alerts. Readings can be updated as frequently as every 2 seconds and logging time and date are automatically updated whenever connected to your smart device.  You can also send and share real-time and logged environmental data via email, Facebook or Twitter

Requirements:

  • iOS 6 installed iPhone 4s, iPad 3rd generation or iPod Touch 5th generation – or any later iOS or hardware configuration. Will not work on iPhone 4, 3GS or 3G or any earlier iPad or iPod generation.
  • Android 4.3 and higher. Works with most Android devices with Bluetooth Smart®, including Samsung Galaxy, Nexus 4, Motorola Droid and other recent generation phones and tablets. 

Environmental Measures

  • Dew Point Temperature
  • Heat Stress Index
  • Pressure Trend
  • Relative Humidity
  • Station Pressure (Absolute Pressure)
  • Temperature
  • Wet Bulb Temperature (Psychrometric)

American-Made Quality and a Five-Year Warranty Every Kestrel environmental instrument is designed and built entirely in the USA. Kestrel’s history and focus on quality and ruggedness is reflected in the DROP’s industry-leading five-year warranty. Kestrel has been building rugged environmental instruments that help people do their jobs more safely and efficiently for more than nineteen years and has built a reputation for reliability one meter at a time.

Environmental Measures

  • Dew Point Temperature
  • Heat Stress Index
  • Pressure Trend
  • Relative Humidity
  • Station Pressure (Absolute Pressure)
  • Temperature
  • Wet Bulb Temperature (Psychrometric)

Features

  • Drop-Tested to MIL-STD-810G
  • Floats
  • LiNK Wireless Communication to Mobile Devices (Bluetooth low energy)*
  • Pressure Sensor
  • Relative Humidity Sensor
  • Temperature Sensor (Patented External Isolated)
  • Waterproof to IP67 (3'/1M for 30 minutes)

Includes

  • Battery - 1 x CR2032
  • Certificate Of Conformity (Spec Sheet)
  • Instructions

Connectivity

Kestrel LiNK for iOS & Android

The Kestrel LiNK® App for iOS/Android allows you to Wirelessly connect with iOS and Android devices and remotely view real-time environmental data and receive alerts for changing conditions. Available for your Kestrel 5 Series Meter or DROP Logger, Kestrel LiNK also provides easy transfer of the Kestrel’s stored data log, a clear graph of all historical data. Alerts can be customized based on temperature, heat index, wind, or other measurements. LiNK enables easy firmware updates of Kestrel 5 series meters.

Data is transmitted wirelessly via Bluetooth® Low Energy within wireless range (100’ line of sight– reduced by walls and obstructions). Mobile device and Kestrel must remain within range to trigger alerts.

SENSORS
SENSORS ACCURACY (+/-) RESOLUTION SPECIFICATION RANGE NOTES
AmbientTemperature 0.9 °F 0.5 °C 0.1 °F 0.1 °C 14 to 131°F -10 to 55 °C Airflow of 2.2 mph|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Battery Operational Temperature Limits.
Relative Humidity 2%RH 0.1 %RH 10 to 90% 25°C noncondensing To achieve stated accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift is typically less than ±0.25% per year.
Pressure 1.5 hPa|mbar 0.044 inHg 0.022 PSI 0.1 hPa|mbar 0.01 inHg 0.01 PSI 25°C/77°F 700-1100 hPa|mbar 20.67-32.48 inHg 10.15-15.95 PSI Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.

 

CALCULATED MEASUREMENTS
MEASUREMENT ACCURACY (+/-) RESOLUTION SENSORS EMPLOYED
Density Altitude 226 ft 69 m 1 ft 1 m Temperature, Relative Humidity Pressure
Dew Point 3.4 °F 1.9 °C 15- 95% RH. Refer to Range for Temperature Sensor 0.1 °F 0.1 °C Temperature, Relative Humidity
Heat Index 7.1°F 4.0°C 0.1 °F 0.1 °C Temperature, Relative Humidity
THI (NRC) 1.5 °F 0.8 °C 0.1 °F 0.1 °C Temperature, Relative Humidity
THI (Yousef) 2.3 °F 1.3 °C 0.1 °F 0.1 °C Temperature, Relative Humidity
Wet Bulb Temperature - Psychrometric 3.2 °F 1.8 °C 0.1 °F 0.1 °C Temperature, Relative Humidity Pressure

 

ADDITIONAL PRODUCT INFO
Response Time & Display Update Display updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity. WBGT requires about 8 minutes to reach 95% accuracy and about 15 minutes to reach 99% accuracy after exposure to large environmental changes.
Data Storage Logged history stored for every measured value. Auto-store interval settable from 2 seconds to 12 hours*, overwrite on or off. D1: >13,000 data points, D2: >7,000 data points, D3: >6,000 data points.
Bluetooth® Data Connect Option Wireless range up to 100ft|30m. Compatible with Kestrel LiNK app for iOS (model 4s and later) and select Android products (Android 4.3 and higher) (See website for complete list of compatible 3rd party apps).
Certifications CE certified, RoHS, FCC, IC tested and WEEE compliant. Individually tested to NIST-traceable standards.
Origin Designed and manufactured in the USA from US and imported components. Complies with Regional Value Content and Tariff Code Transformation requirements for NAFTA Preference Criterion B.
Battery User-replaceable CR2032 (included).
Shock Resistance MIL-STD-810g, Transit Shock, Method 516.6 Procedure IV; unit only; impact may damage replaceable impeller.
Sealing Waterproof (IP67 and NEMA-6)
Battery Operational Temperature Limits 0° F to 140 ° F | -18 °C to 60°C Measurements may be taken beyond the limits of the operational temperature range of batteries by maintaining the unit within the operational range and then exposing it to the more extreme environment for the minimum time necessary to take reading.
Storage Temperature -22.0 °F to 140.0 °F | -30.0 °C to 60.0 °C.
Size & Weight 2.4 x 1.8 x 0.9 in | 6 x 4.5 x 2.3 cm 1.2oz | 34g (Lithium battery included)

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