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The Kestrel DROP is a wireless environmental data logger designed to measure and record various environmental parameters. It is a compact and portable device, easily identifiable by its orange or tan casing and a small loop for attachment. The device is equipped with several sensors and indicators to provide comprehensive environmental data.
The primary function of the Kestrel DROP is to log environmental data wirelessly. Once the battery tab is removed and the device is powered on, it immediately begins logging data. The DROP logs data at a default rate of once per hour, but this rate can be adjusted by the user through the Kestrel LiNK application. The device continues to log data until its memory is full or until the battery runs out, especially if the "wrap log" feature is enabled, which allows continuous logging by overwriting the oldest data.
The Kestrel DROP is capable of measuring several environmental parameters, depending on the specific model. All models include a temperature sensor. The D2 and D3 models also feature a humidity sensor, while the D3 model additionally includes a pressure sensor. These sensors allow the device to record data related to air temperature, humidity, and atmospheric pressure.
The device communicates wirelessly via Bluetooth Low Energy (BLE) with a mobile device running the Kestrel LiNK application. This connectivity enables users to connect their DROP, update its settings, view real-time data, upload logged data, and receive alerts. The Bluetooth range is up to 100 feet, though this can be affected by obstructions such as metal enclosures, water, ice, or ground-level placement. For optimal Bluetooth performance, it is recommended to elevate the DROP above ground level.
To begin using the Kestrel DROP, the user must first remove a battery tab, which activates the device. The device's status button and LED provide visual feedback on its operation. A solid LED indicates that the unit is functioning normally, while a blinking LED can signify that the battery was inserted, Bluetooth has connected or disconnected successfully, or that the device is in "Beacon Mode" to promote its visibility in the Kestrel LiNK app. Pressing the status button can also quickly establish a Bluetooth connection and test the battery, with the LED lighting green if the battery is good.
The Kestrel LiNK application is central to the DROP's usage. Users need to download the app (available for Android and iOS) and ensure Bluetooth is enabled on their mobile device. Upon opening the app, the DROP should appear, allowing the user to connect. Connecting the DROP to the app is crucial for ensuring the date and time are updated on the device and that all settings are correct before field use.
Within the Kestrel LiNK app, users can manage various aspects of their DROP. They can access "Device Settings" to configure the data logging rate, which determines how frequently the DROP records measurements. The app also allows users to "Sync Log" to manually upload all data from the DROP to the app and "Export Log" to save the data as a CSV file. All saved data can be viewed and exported from the "History" tab within the app.
For accurate humidity readings, the DROP needs time to equilibrate to its environment, which can take between 20 and 90 minutes. The humidity graph in the Kestrel LiNK app can help users monitor when equilibrium is reached, as the graph will trend flat. The device can also be submerged in water (up to 1 meter for 30 minutes) to measure water or snow temperature.
The Kestrel DROP is designed to operate within a temperature range of 14°F/-10°C to 131°F/55°C without restriction. Operation at lower temperatures is possible, down to 0°F/-18°C, but with limitations related to battery power and life span. In cold conditions, it's recommended to use a fresh battery, keep data log downloads short, or allow the DROP to warm up before downloading logs.
Battery replacement is a key maintenance task for the Kestrel DROP. The device uses a coin cell battery. After replacing the battery, it is essential to reconnect the DROP to the Kestrel LiNK application. This step ensures that the time and date are updated correctly for logging purposes.
When opening the battery door for replacement, users should inspect the o-ring. It is important to ensure the o-ring is clean and properly aligned before closing the battery door. This helps maintain the device's water resistance and overall integrity.
Battery life is influenced by several factors, including cold conditions, frequent logging rates, and frequent data downloads. Intensive logging and connection settings, such as a 2-second logging rate and constant connection, can significantly reduce battery life. Conversely, less frequent logging and connections, along with room temperature operation, will extend battery life. When performing tasks that consume more power, such as downloading extremely large data logs or making firmware updates, it is advisable to avoid low battery levels and conditions below 32°F/0°C.
After the DROP has been submerged in liquid, any humidity readings will be affected until the humidity sensor area is fully dry. Gently blowing on the sensor area (the small grid of holes on the front case) can help speed up this drying process. Additionally, exposure to temperatures above 80°C/176°F may cause a temporary offset in humidity readings.
General| Humidity Range | 0 to 100% RH |
|---|---|
| Waterproof/Resistance | IP67 |
| Measurement Parameters | Temperature, Humidity, Barometric Pressure, Wind Speed, Wind Direction |
| Barometric Pressure Range | 300 to 1100 hPa |
| Battery Life | Up to 1 year |
| Connectivity | Bluetooth Low Energy (BLE) |
| Wireless Range (Line of Sight) | Up to 100 ft |
| Resolution | Temperature: 0.1°F/°C, Humidity: 0.1% |
| Battery Type | CR2032 coin cell |
| Memory | Non-volatile |
| Wind Direction Range | 0° to 359° |
| Accuracy | ±0.5 °C |
| Logging Interval | 1 second to 1 hour |
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