Kestrel DROP D1 User manual

1Please visit www.kestrelinstruments.com/support/drop_support for more information.
Getting Started

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Table of Contents
3 Getting Started with Your Kestrel DROP
4–5 Connecting your DROP to the Kestrel LiNK Application
6 Uploading and Exporting your Data
7 Using Your Kestrel DROP
8 DROP Connection Guidance
9 Battery Replacement
10 Getting More from Your DROP
11 Glossary of Measurements

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Getting Started with Your Kestrel DROP
Please note: You will need to remove the battery tab prior to using the DROP.
Please remove tab prior to operation.
Overview
Pressure Sensor (D3 Only)
Humidity Sensor
(D2 and D3 only)
Status Button
LED Location
Figure 1: Overview
Temperature Sensor
Note: Tab can be removed without opening battery door.

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Connecting your DROP to the Kestrel LiNK Application
• To begin, download Kestrel LiNK for Android or
iOS from the Play Store (icon shown).
• Make sure Bluetooth is enabled on the mobile
device you are using.
• Open the Kestrel LiNK app and when your
device appears, select the Connect button.
Please note: You must connect the DROP to our Kestrel LiNK application PRIOR to using it in the eld to ensure the date and
time are updated on the DROP and the settings are correct.

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Connecting your DROP to the Kestrel LiNK Application
Please note: You must connect the DROP to our Kestrel LiNK application PRIOR to using it in the eld to ensure the date and
time are updated on the DROP and the settings are correct.
From the Devices screen,
select the Settings button.
Navigate to the Manage
Device Data Screen.
Here you can set the Data
Logging Rate on the DROP.
Time and Date are updated
upon connecting.

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Uploading and Exporting your Data
From Manage Device Data Screen:
• Press Sync Log to manually upload all the data on the DROP.
• Press Export Log to export the data log as a CSV le.
• You can view and export all saved data on the History tab.
More Information
For detailed instructions of all the features of the Kestrel LiNK App, please
review our Kestrel LiNK instructions found here:
https://kestrelinstruments.com/mwdownloads/download/link/id/1083/

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Using Your Kestrel DROP
• As soon as the battery supplies power to the DROP, it begins logging data.
Battery life will depend on logging rate, amount of time connected to
Kestrel LiNK app and ambient temperature. The only way to stop a DROP
from logging is to remove the battery.
• The DROP will log at the default of once per hour unless the user changes
the logging rate with the Kestrel LiNK app.
• The DROP will continue logging until the memory is full or if “wrap log” is
enabled, it will log until the battery runs out.
• Status Button and LED functions: status button will promote a DROP to
the top of the devices list in the LiNK app. “Beacon Mode” on the app will
cause the LED to blink.
If Battery Is Inserted
Unit is on. (Only powers off if battery is removed)
Bluetooth is on.
DROP is logging data.
LED Condition Status Button Possible Conditions
Pressed Unit is functioning normally.
Not Pressed Battery was inserted.
Bluetooth has connected successfully.
Bluetooth has disconnected successfully.
Note: Status button can be used to immediately send a connection signal to your iOS/Android device.
LED Indicators

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DROP Connection Guidance
Bluetooth range
(Up to 100 feet)*
Press button to connect BT quicker
(Also to test battery, LED will light Green)
Metal enclosures will block signal
* Bluetooth radio will perform better
if the DROP is elevated above
ground level.
MUST BE IN RANGE TO:
• Upload DROP Data
• Update DROP Settings
• View Real-time Data
• Receive Alerts
Water or ice may
affect range

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Battery Replacement
(Please note: After battery replacement, you MUST reconnect to the Kestrel LiNK application to ensure time
and date are updated for logging purposes.)
Figure 2: Battery Replacement
Note: Please inspect the o-ring when opening battery door and ensuring it is clean before replacing door.
Also ensure it is properly aligned when closing battery door.

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Temperature
• Aslightairowof2mphormorewillspeeduptemperatureresponsetimes.
• DROP can be used to measure water or snow temperature by submerging the thermistor.
• DROP can withstand being in 1 meter of water for up to 30 minutes.
Humidity
• For accurate humidity readings, allow the DROP to equilibrate to its environment. Depending on the temperature and humidity differential
betweenenvironments,thiscantakebetween20and90minutes.
Note: Users can use the graph in the Kestrel LiNK app to monitor when the humidity reaches equilibrium as the humidity graph will trendat
when it reaches this point.
• After submersion in a liquid, humidity readings, if available on your DROP, will be impacted until the humidity sensor area has fully dried. Gently
blowing on the sensor area (the small grid of holes in the front case) can speed this process.
• After exposure to temperatures over 80°C/176°F, an offset in humidity may be present for a period.
Connectivity
• Typical range is 100 ft but longer ranges can be achieved. Metal enclosures, ice, submersion in liquids, obstructed lines-of-site and ground level or
non-vertical logging positions will reduce connection range.
• If more than 3-4 DROPs are present, turning off auto connect and manually connecting one at a time will help the app connect successfully.
Typically, a maximum of 8 DROPs can be connected to a device at a time.
• The DROP uses Bluetooth Low Energy (BLE) to connect to devices.
Operating Temperature
• The DROP will operate without restriction from 14°F/-10°C to 131°F/55°C. Operation at lower temperatures will be limited by the available power
and life span of the coin cell battery. Downloading a full data log in temperatures below 14°F/-10°C may tax the battery to the point where the
DROP will not operate until the battery has been replaced. For best results below 14°F/-10°C, use a fresh battery, keep data log downloads short
(1000 data points or fewer), or allow the DROP to warm to above 14°F/-10°C before connecting or attempting to download logs. The DROP can
generally be expected to continue to log data points down to 0°F/-18°C with these limitations.
Battery Life
• Cold conditions, frequent logging rates, and frequent log downloads will all shorten battery life.
• Whendownloadingextremelylargedatalogsormakingrmwareupdates,avoidusinglowbatteriesandconditionsbelow32°F/0°C.
• Estimated battery life at the baseline settings programmed into your DROP when shipped from the factory (10 min logging rate, 5 sec connection
rate)androomtemperature(77°F/25°C)isabout4months.Intensiveloggingandconnectionsettings(2secloggingrate,constantconnection)
can reduce battery life to as little as 11 days.
Getting More from Your DROP

11 Please visit www.kestrelinstruments.com/support/drop_support for more information.
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Temperature (Air/Water/Snow): Air temperature is
the ambient temperature of the air and water vapor as
measured by a thermometer or other measuring device
in which the thermal element is dry and shielded from
radiation. Water and snow temperature are measured with
a measuring device in direct contact with the environment.
Available units are Fahrenheit – a temperature scale where
wateratsealevelhasafreezingpointof+32°F°,anda
boilingpointof+212°F;andCelsius–atemperaturescale
where water at sea level has a freezing point of 0° C and a
boiling point of +100° C.
Relative Humidity: The ratio of the amount of water
vaporintheairataspecictemperaturetothemaximum
amount that the air could hold at that temperature,
expressed as a percentage. Relative humidity is a function
of temperature and therefore changes as the temperature
changes, even if the amount of moisture in the air remains
constant.
Heat Stress Index: A measurement of the air
temperature in relation to the relative humidity, used as
an indicator of the perceived temperature.
Dew Point: The temperature at which the water vapor in
the atmosphere begins to condense. Any further cooling
causes condensation (fog and dew). This is also the
temperature of saturation at which the dry-bulb, wet-bulb
and dew-point temperatures are all the same.
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Wet Bulb: The lowest temperature in the ambient
atmosphere yielded by evaporating water from a wet
muslin-covered bulb of a thermometer.
Glossary of Measurements
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Absolute/Station Pressure: The actual measured pressure
of the weight of air above the measurement point. Often
called station pressure.
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Density Altitude: The equivalent altitude in the ICAO
standard reference atmosphere for the measured temperature,
relative humidity and air pressure. A measure used primarily by
pilots, high-performance engine mechanics and long-range
shooters.
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