Relative Humidity Calibration Kit For calibrating the following Kestrel Meters Kestrel 5 Series, 4 Series and Kestrel 3000-3500 Series (Kestrel DROPs currently cannot be recalibrated) Kestrelinstruments.com 800.784.
●●●●● While the calibration process is simple, it is important that you follow the steps carefully. A careless calibration could enter incorrect values into the unit and degrade its performance. ●●●●● ©2019 Nielsen Kellerman Co. Kestrel, the Kestrel bird, NK, Nielsen-Kellerman and the NK logo are registered trademarks of the Nielsen-Kellerman company.
Factory Recalibration / Certification The Kestrel should be recalibrated if the RH sensor has shown drift in its RH measurement. The Kestrel RH sensor is specified to develop less than 2% drift over 24 months. You may return your Kestrel to NK for Factory Recalibration of the relative humidity and related measurements. Recalibration is available with and without certification of NIST traceability and calibration stickers. Note that NK can recalibrate and certify any of the values measured by your Kestrel.
Contents of the Humidity Calibration Kit » Two jars with color-coded salt chamber labels, plastic spacer grids and sealing lids » One jar with no spacer grid (for water) » One vial with magnesium chloride (MgCl) salt and blue color-coded label » One vial with sodium chloride salt (NaCl)and red color-coded label » One RH Calibration Kit insulated bag/carry case » One color-coded labeled measuring cup Note: Our calibration process has changed.
Preparing the Calibration Salt Solutions » For your first use only, you will need to add water to the provided salts to prepare the saturated salt » » » solutions for the calibration chambers. Note that it is important not to cross-contaminate either salt solution with the other salt. For this reason, every item is color-coded. Make sure to keep red items with red, and blue with blue, throughout the mixing and calibrating process. You will be mixing the salts with water.
7. Make sure not to pour in more than 5 ml. of water! It is better to start with slightly less water, and add it a drop at a time, as this solution tends to absorb water quickly and become too wet. 8. Return the two plastic spacer grids to their jars so the feet sit down in the salt slurry. 9. Fill the empty third jar with room temperature water. 10. For Kestrel 4 and 5 Series units, remove the lanyard. 11.
Setting up the Relative Humidity Recalibration Routine for Kestrel 5 Series units. 1. Check the battery status on the start-up screen. If the battery indicator does not show near full battery life remaining, replace the battery with a new Lithium AA battery. 2. Enter the main menu by pressing the gear button in the upper left. Scroll to and select System, then scroll to and select Humidity Cal. Ensure the calibration settings are set to the values shown below.
3. Scroll to highlight the ”Start Low” field and press the center, select button. The words “Start Low” should be replaced by the word “Running” and a timer counting down from 24 hours. Note the time the “Start Low” routine was started and plan to move the Kestrel unit to the next jar in 24 hours. 4. Place the Kestrel in the jar marked 32.8% (Low) with the impeller facing down and tightly close the lid on the jar, then place the jar in the zipper case. 5.
Setting up the Relative Humidity Recalibration Routine for Kestrel 3000-3500 Series units. Example Recalibration Schedule Day 1 8:30am Day 2 9:00am Set up calibration jars-30min Begin equilibration in 1st jar-24hr 9:00am Start 1st jar calibration timer - 1 hr Day 3 10:00am Begin equilibration in 2nd jar-24hr 10:00am 11:00am Start 2nd jar calibration timer - 1 hr Complete Follow the instructions below that pertain to your unit (two or three button models). Kestrel 3000-3500 (Three-Button) 1.
Kestrel 3000 (Two-Button) 1. To set to the RH calibration values, with the Kestrel turned on and displaying the Dew Point measurement (not Relative Humidity), press the On and Mode button at the same time for approximately 6 seconds. The screen will display P1. 2. With P1 showing, press the On button again to bring up the first calibration point value. Adjust the value till 74.0 is showing by pressing Mode to change the value of the flashing digit and pressing On to move to the next digit.
5. Let the kit sit for at least 24 hours to ensure the temperature within the kit has equilibrated and the humidity inside the jars has reached the correct levels. 6. After the 24 hour equilibration period, open the 1st jar and while keeping the jar opening covered as much as possible, quickly remove the Kestrel unit and start the first calibration period by following the instructions for your unit. Kestrel 3000-3500 (Three-Button) 7.
10. Move the Kestrel to the 2nd salt jar and make sure that the jar lid is closed tightly. (For three button Kestrel 3000-3500 Series units, the 2nd jar will be the 74.0% (High) RH jar. For Two-Button 3000 units the 2nd jar will be the 32.8% (Low) jar.) Return the jars to the zipper pouch and if using, into the insulated cooler as well. Let the kit sit for an additional 24 hour equilibration period. 10.
Setting up the Relative Humidity Recalibration Routine for Kestrel 4 Series units. Example Recalibration Schedule Day 1 8:30am Set up calibration jars-30min Day 2 9:00am Begin equilibration in 1st jar-24hr 9:00am Start 1st jar calibration timer - 1 hr Day 3 10:00am Begin equilibration in 2nd jar-24hr 10:00am 11:00am Start 2nd jar calibration timer - 1 hr Complete 1. If the battery indicator does not show near full battery life remaining, replace the batteries with new Lithium AAA batteries. 2.
DO NOT PRESS “START 1” AT THIS TIME. 3. Place the Kestrel in the jar marked 32.8% (Low) with the impeller facing down and tightly close the lid on the jar, then place the jar in the zipper case. 4. Close the zipper case with all three jars inside and if using an additional insulated cooler and water jugs, place everything inside the larger cooler with the lid closed. Ensure the salt jars remain level so that the Kestrel unit maintains it position above the salt. 5.
10. After the second 24 hour equilibration period, open the 2nd jar and while keeping the jar opening covered as much as possible, quickly remove the Kestrel unit and start the second calibration routine by scrolling to Start 2 in the Humidity Cal menu and pressing Select. Start 2 will change to say Running 2 and the number of seconds will countdown till the second calibration measurement is taken. 11.
Using the Calibration Kit to Check Your Unit’s Calibration Accuracy 1. Prep the salt jars and Kestrel unit as described in the section titled Preparing the Salt Solutions and Kestrel for Calibration. Kestrel 4 & 5 Series Units 2. 3. 4. Set your Kestrel to display Relative Humidity and go into the settings menu and turn off Auto Shutdown. Place your Kestrel in one of the two salt jars and let it sit for 24 hours inside the insulated zipper pouch.
Kestrel® Weather and Environmental Meters are designed and manufactured in the USA By NIELSEN-KELLERMAN 21 Creek Circle, Boothwyn, PA 19061 Phone: (610) 447-1555 Fax: (610) 447-1577 Web: Kestrelinstruments.com Email: info@NKhome.com Please register your Kestrel Meter at www.Kestrelinstruments.com 319024_3_19.03.
