Kestrel DROP D2AG Livestock Heat Stress Monitor

Rating:
96% of 100

Livestock heat stress can cause serious health issues in your valuable livestock as well as reduced performance and productivity. Stay informed of heat conditions in the barn or during transport with the Kestrel D2AG Livestock Heat Stress Monitor. Multiple built-in environmental measurements mean your DROP D2AG can also be used for many other agricultural applications including hay and feed storage areas and greenhouses.

$99.00
Availability: In stock
SKU
0720AGHVG

 FREE US SHIPPING
  • The EASIEST way to monitor and track livestock pen, barn, or truck conditions to ensure animal health and well being.
  • Measures temperature, relative humidity, heat stress index, dew point temperature and Temperature Humidity Index (THI).
  • View data wirelessly via Bluetooth® low energy on your iOS phone or tablet with the free Kestrel LiNK app when within wireless range (up to 100’ or more line of sight.)
  • See, save and share data from multiple DROPs with just one phone or tablet. Store thousands of data points and get months of logging on a single coin-cell battery - customize logging rate, connections and alerts.
  • Rugged (drop tested to MIL-STD-810G standards), dust and waterproof (sealed to IP67 standards).
  • 5-year warranty.

Kestrel DROP D2AG Livestock Heat Stress Monitor Overview

Environmental Measures
Dew Point Temperature
Heat Stress Index
Relative Humidity
Temperature Humidity Index (THI)
Temperature
Tips For Taking Accurate Measurements

The Kestrel Drop D2AG Livestock Heat Stress Monitor is a very affordable rugged heat stress monitor that can be used in the barn, during transport, or anywhere livestock are housed. Simply hang in place wherever insight into conditions is needed, and access current conditions and historical readings with your iOS or Android device. Designed by Kestrel with input from some of the world's most respected experts in livestock heat stress, the Kestrel DROP D2AG Livestock Heat Stress Monitor is designed to help you MEASURE and MANAGE your animals’ heat stress, ensuring you MAXIMIZE your bottom line.

  • Direct readout of Temperature Humidity Index (THI) – a dairy cattle specific measurement that provides guidance for when heat stress will start to reduce milk production.  
  • Also measures heat stress index, temperature, humidity and dew point for application to many types of livestock and agricultural applications.
  • The EASIEST and most accurate way to monitor and track environmental measurements critical to agriculture in almost any farm, home or transport location – wet or dry, indoors or out.
  • Easily hangs inside a barn, transport vehicle or wherever livestock are housed.
  • Horse shippers - monitor trailer temperatures and heat index from inside your truck! Know when to find shade or take a break to water your horses.
  • View data wirelessly via Bluetooth® low energy on your iOS phone or tablet with the free Kestrel LiNK app when within wireless range (up to 100’ or more line of sight.)
  • Store thousands of data points and get months of logging on a single coin-cell battery - customize logging rate, connections and alerts.
  • Rugged (drop tested to MIL-STD-810G standards), dust and waterproof (sealed to IP67 standards).
  • 5-year warranty.

Visit the Cattle Heat Stress Minisite for a more detailed look at this breakthrough tool.


Use a DROP Anywhere livestock are housed- Small, Accurate, Rugged and Waterproof

Each 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.

DROPs Are Powered by the Kestrel LiNK App

DOWNLOAD KESTREL LiNK FOR iOS

DOWNLOAD KESTREL LiNK FOR ANDROID

Drop D2 Livestock Heat Stress Monitor with Mobile App

Kestrel LiNK is the free app that powers the DROP loggers. 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.  Each phone or tablet can connect to up to 8 DROP loggers at the same time and store data logs from many more. 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, iPod Touch 5th Generation and above.
  • Android 4.3 and higher. Works with most Android devices with Bluetooth® low energy, including Samsung Galaxy, Nexus 4, Motorola Droid and other recent generation phones and tablets. 

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 fifteen years and has built a reputation for reliability one meter at a time.


Compare All Livestock and Agriculture Models

MeasurementsDROP D2AG $995000AG $2695500AG $3195400AG $699
Temperature yes yes yes yes
Relative Humidity yes yes yes yes
Heat Stress Index yes yes yes yes
Temperature-Humidity Index (THI) yes yes yes yes
Dew Point Temp. yes yes yes yes
Wind Speed/Air Speed   yes yes yes
Wind Chill   yes yes yes
Wet Bulb Temp. (Psychrometric)   yes yes yes
Station Pressure (Absolute Pressure)   yes yes yes
Barometric Pressure   yes yes yes
Altitude   yes yes yes
Density Altitude   yes yes yes
Volume Air Flow   yes yes  
Wind Direction     yes yes
Crosswind / Headwind / Tailwind     yes yes
Delta T     yes yes
Globe Temp.       yes
Naturally Aspirated Wet Bulb Temp.       yes
Wet Bulb Globe Temp. (WBGT)       yes
Heat Load Index (HLI)       yes
Accumulated Heat Load Units (AHLU)       yes



Which Kestrel DROP is right for me?

MEASUREMENTS DROP D1 DROP D2 DROP D2HS DROP D2AG DROP D3 DROP D3FW
Temperature
Relative Humidity  
Dew Point Temp.  
Heat Stress Index  
Station Pressure (Absolute Pressure)        
Density Altitude        
Temperature Humidity Index (THI)          
Wet Bulb Temperature (Psychrometric)          
Color Available Red, Blue, Tan Red, Blue, Tan Orange Hi-Viz Green Red, Blue, Tan Orange
  Buy Now Buy Now Buy Now Buy Now Buy Now Buy Now
  • Agriculture
  • Animal Transport
  • Cattle Management & Heat Stress
  • Farming & Agriculture
  • Meteorology
  • Chicken/Poultry Farming
  • Veterinary Research & Testing
  • Drop-Tested to MIL-STD-810G
  • Floats
  • LiNK Wireless Communication to Mobile Devices (Bluetooth low energy)*
  • Relative Humidity Sensor
  • Temperature Sensor (Patented External Isolated)
  • Waterproof to IP67 (3'/1M for 30 minutes)
  • Battery - 1 x CR2032
  • Certificate Of Conformity (Spec Sheet)
  • Instructions
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 516.5 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)

DROP Data Logger Certificates of Comformity

Kestrel DROP Wireless Environmental Data Logger specification chart


Model & SKUs: Kestrel DROP D2 - Part #0720AGHVG

 


LiNK (Kestrel)

Instructions for the use of the Kestrel LiNK App

This tutorial will show you how to create a graph of the data that you exported from your Kestrel 5000 series or Kestrel DROP using one of the Kestrel LiNK applications.

A simple guide to help you update your Firmware on your Kestrel using LiNK for Android

A simple guide to help you update your Firmware on your Kestrel using LiNK for Windows

Setting up Alert Services on Kestrel LiNK Application for Multiple People

DROP Data Logger Certificates of Comformity

Kestrel DROP Wireless Environmental Data Logger specification chart

DROP Data Logger Instruction Manuals

Getting Started with Kestrel DROP Wirelss Environmental Data Loggers

Kestrel 5 Series Instruction Manuals

03/17/17

Product Questions

"All measurements not available in all units"

Temperature Functions

For best accuracy when taking temperature measurements you must keep the air moving around the temperature sensor and keep the Kestrel out of prolonged, direct sunlight. If there is a strong breeze, just point the Kestrel into the wind. If there is no wind, swing the Kestrel around in a circle on its lanyard or rapidly wave it back and forth in hand. This ensures that the sensor measures the temperature of the air rather than the temperature of the case. Alternatively, if you have time, allow the Kestrel to rest where you want to measure the air temperature (NOT in your hand or in direct sunlight if there is no wind) until the case temperature equalizes with the air temperature. When equalized, the display will read a constant value. Be aware that this could take a few minutes, particularly if there is no wind.

Humidity Functions

One reason your Kestrel may not be reading accurate ambient humidity is because of proximity to humidity sources such as your hand, your body or the ground. Avoid covering the large humidity chamber opening on the case rear with your fingers. Keep all fingers below the finger groove and away from the chamber opening. Do not take reading that rely upon humidity with the Kestrel meter lying flat – raise it into the air vertically or stand it on its base and orient it into the wind or air flow. If a high level of accuracy is required for measurements involving humidity, do not hold the unit while taking measurements. Taking readings with the Kestrel in your hand or over your body can raise relative humidity by 5% or more. A Kestrel vane mount will isolate the Kestrel Meter from erroneous humidity influences and keep it oriented into the wind or air flow while taking measurements. Whenever you move your Kestrel Meter into a new environment wait until the primary sensor values have stabilized (Temperature, Humidity, etc.) before taking measurements that rely upon these values. After a large change in environmental condition, this may take 15 minutes or more, with humidity potentially taking the longest. If the humidity sensor housing (located above the rear label) is wet, the Kestrel cannot take an accurate humidity reading. If the sensor does become wet, shake the unit vigorously to remove the water, and then let it dry completely before use. If the sensor comes in contact with salt water, rinse it thoroughly with clean water, then shake it and allow it to dry. As is typical with humidity sensors, it is possible for the humidity sensor in the Kestrel to drift over time as described in the spec sheet. If your unit has a Humidity recalibration function, it can be returned to the factory or used with the Kestrel RH Calibration Kit to recalibrate its humidity readings.

Wind Meter Functions

Wind speed is highly dependent on surrounding obstructions such as buildings, yourself and the ground, with wind speeding up as it flows around and over obstacles and slowing down as it passes behind them. Even in an open area, Wind speed will be slower near the ground so ensure you are taking measurements at an appropriate height for your application. Hold the back of the unit directly into the wind. Holding the unit off-axis by 5° will reduce accuracy by 1%, 10° will reduce accuracy by 2% and 15° will reduce accuracy by 3%. Using a Kestrel Vane Mount will ensure the unit is correctly oriented into the wind and measuring accurate wind speeds. The Kestrel impeller housing can rotate in the unit. For best accuracy, ensure one of the three “arms” of the impeller housing is pointing straight up. The wind speed displayed by the Kestrel Meter is a 3 second rolling average. This allows the unit to provide a value that is more representative of the typical, ambient conditions but not capture peak speeds for instantaneous blasts of air.

Compass Functions

The compass in the Kestrel Meter is used for direction, crosswind, headwind/tailwind as well as for capturing various user inputs based on direction. When calibrating and when using the compass, it is important to hold the unit as vertically as possible. Any tilt in angle present when the unit is calibrated or when measurements are taken will negatively impact the accuracy of the compass reading. Many users will inadvertently tilt the Kestrel Meter away from themselves slightly when holding the unit. If a high level of accuracy is required, using a Kestrel vane mount on a leveled tripod for calibration and measurement can eliminate error.

Pressure Functions

All pressure and altitude measurements are made using the pressure sensor. Some units have a dedicated “Pressure” screen which shows Station Pressure, the raw pressure reading straight from the sensor. The Barometric Pressure measurement (Baro) displays the local Barometric Pressure using the Station Pressure measurement adjusted to the local altitude using the Reference Altitude value input by the user. The Altitude measurement displays the local altitude using the Station Pressure measurement combined with the Reference Baro value input by the user. To obtain an accurate barometric pressure or altitude readings, you must first know EITHER your location’s current barometric pressure OR your current altitude. If the Reference Altitude value is incorrect, the Barometric Pressure reading will also be incorrect. If the Reference Barometric pressure value is incorrect, the Altitude reading will also be incorrect. Because Barometric Pressure and Altitude are each dependent on the alternate reference value remaining constant, Barometric Pressure and Altitude cannot be accurately measured simultaneously. If your unit has a pressure recalibration function, a new Barometric Pressure calibration value may be input. If this value was not taken from a verified source (a local airport or weather station) with the Kestrel being calibrated at the same location as the reference device, pressure related measurements may be incorrect.

WBGT

When changing environments (such as moving form an air conditioned room to outdoors or removing the unit from your pocket) the unit requires between 8-15 minutes to equilibrate to its surroundings before taking readings. Take measurements at least 3 feet off the ground and in the same wind or air flow conditions as the people you are monitoring. Ensure the Kestrel is oriented into the wind and able to measure the full wind value. A tripod or pole mount and the Kestrel Rotating Vane Mount are ideal for ensuring accurate measurements. Differences in the reflectivity of ground surfaces such as grass or asphalt will impact measurements. Be sure to take measurements in the same solar/radiant heat environment as the people you are monitoring. Unlike best practices for other measurements, WBGT is intended to be taken in direct sunlight. As long as there is occasional wind the Kestrel has software that allows it to maintain an accurate WBGT reading despite being placed in direct sunlight.

Air Flow

Kestrel Professional Meters can calculate air flow through a duct by combining user input information about the size and shape of the duct with the measured air velocity. In addition to reading the instantaneous Air Flow off the main measurement screen, a more accurate result may be obtained by capturing an average air flow on the Min/Ave/Max screen while traversing the duct. Traversing consists of dividing the area of the duct into evenly sized sections and averaging the air flows at the center of all sections. By spending an equal amount of time at each measurement location and quickly moving between measurement locations, the average air flow measurement can provide a more accurate measure of the air flow in the duct. Capturing an average can be particularly helpful when measuring ducts with registers or dimensionally uneven air flow.

Air Flow Diagram

Evaporation Rate

(Kestrel 5200 Professional Environmental Meter) Kestrel Professional Meters can calculate a concrete evaporation rate (ACI 308) by combining a user input concrete temperature with measured air temperature, wind speed and relative humidity. Concrete mix temperature is generally measured with a probe or infrared thermometer and should be read at the time of making the evaporation rate measurement After inputting the mix temperature, hold the unit vertically, approximately 20 inches above the surface of the concrete while facing the rear of the unit directly into the wind. To avoid inaccurate Evaporation Rate readings due to thermal loading it is best to shade the Kestrel. (Be sure the source of shade is not obstructing the wind speed measurement.) The ACI recommends taking a 6-10 second average of the evaporation rate to account for fluctuating wind speeds. To measure an average Evaporation Rate, scroll right from the Evaporation Current Measurement Screen to the Min/Ave/Max Screen and press select to manually start and stop a capture.

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The Stats page shows the data that is currently stored in the logger on the DROP. Currently you need to disconnect and reconnect to acquire more data, so the Refresh is useful only during an active download. You can hit the Refresh button to populate more Stats as they are in the process of being downloaded to the application.

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Set the logging rate to the max, 12 hours. You could set the data refresh rate to its max, 1 minute, but that will only have an effect when connected to the DROP. Also if you connect to the DROP in colder weather, this will affect battery life more than in warmer temperatures. If possible, warm up the DROP before doing a data upload to Kestrel LiNK to help with battery life.

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This is really just personal preference. If the DROP name is related to its location or purpose, then obviously changing the name would be helpful each time.

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Yes. Once you make the settings to the DROP (custom name, logging rate, data refresh rate), those settings stay with the DROP itself. This means that all anyone else would have to do is download the Kestrel LiNK(Formerly Kestrel Connect) app from the iTunes App store and connect to the DROP to access.

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To read the data that has been logging on the DROPs, all you have to do is simply connect to the DROP with your iOS or Android device and the data log will be downloaded. You can tell it’s downloading by looking at the DROP’s name near the top of the screen, as you’ll see a spinning graphic and a percentage that changes over time. Once it has reached 100%, you’ll have to navigate to the Stats screen using the menu at the bottom of the app. There you’ll find an Export Data button at the top which you can use to email the data log to yourself and then print it out.

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DROP D1

  • Data Points: 13064
  • Logging every 2 seconds - Fills up after 7.5 hours
  • Logging every 10 minutes - Fills up after 90.7 days
  • Logging every 2 hours - Fills up after 544 days

DROP D2

  • Data Points: 8165
  • Logging every 2 seconds - Fills up after 4.5 hours
  • Logging every 10 minutes - Fills up after 56.7 days
  • Logging every 2 hours - Fills up after 340 days

DROP D3

  • Data Points: 8165
  • Logging every 2 seconds - Fills up after 3.4 hours
  • Logging every 10 minutes - Fills up after 56.7 days
  • Logging every 2 hours - Fills up after 340 days
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This is dependent on a setting for the DROP in the Manage Data Log section. If you go to Manage->Manage Data Log, you will notice a Wrap Log toggle button. If the Wrap Log toggle button is slid to the right (indicates ON), then the oldest logged data will be overwritten when the data logger is full. If the slide is to the left (indicates OFF), then no more data will be collected when the data logger becomes full.

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Please check out our tutorial:

LiNK (Kestrel)

Setting up Alert Services on Kestrel LiNK Application for Multiple People

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The D1 can store 13064 data points. The D2 can store 8165 data points.And the D3 can store 6220 data points.

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LiNK (Kestrel)

Instructions for the use of the Kestrel LiNK App

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