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Kestrel® 3000 Pocket Weather® Meter

9

Replacing the Impeller

You may recalibrate the wind speed readings by replacing 
the impeller. Press FIRMLY on the sides of the black impeller 
housing with your thumbs to remove the entire assembly. 
When inserting the new impeller, be sure the arrow is facing 
the display side of the unit, and is aligned with the top of 
the meter. Press on the sides of the housing rather than the 
center.

Taking Accurate Humidity, Heat Stress and Dewpoint Measurements

The patented system for measuring relative humidity allows for extremely fast and accurate 
readings. The sensor is located in the large hole on the rear of the unit. Even extreme and 
abrupt changes in the surrounding humidity will be measured within several minutes. To 
test this, place your hand around the rear of the unit. Within several seconds, the humidity 
will increase dramatically. After removing your hand, the humidity will quickly begin to 
decrease. Next, place your hand near the rear of the unit and wave the unit back and forth. 
The humidity will not change because the air flow is diluting the humidity from your hand.

This example shows the importance of keeping air flow past the sensor while taking a 
measurement. If there is no natural air flow past the sensor, wave the unit back and forth. 
It is also reasonable to lay the unit down on a solid surface for several minutes to allow the 
sensor to adjust. 

Replacing the Impeller

Sensors & Calibration

Kestrel Pocket Weather Meters use precision sensors to measure the environment. These 
sensors have all been factory calibrated to NIST-traceable standards, and are accurate within 
the stated specifications at the time of manufacture. 

The wind is measured with the patented user-replaceable impeller. It is mounted on a 
sapphire bearing that begins to measure readings in the slightest of breezes. 

The patented external temperature sensor is mounted on long, coiled leads that help 
to further isolate the bulb from the case. This ensures that the Kestrel is reading the air 
temperature and not the case temperature, may be warmer if the unit was in your pocket or 
warmed by your hand. 

The patented relative humidity sensor is designed to adjust quickly to abrupt changes in 
humidity, and maintains this accuracy and speed in extremely low humidity conditions. 
The RH sensor is located on the back of the unit and is protected by a membrane. DO NOT 
puncture this membrane. It will damage the sensor and require replacement.

For recalibration of the sensors, the unit may be returned to NK for factory calibration. The 
wind and humidity sensors can all also be field-calibrated. To recalibrate the wind speed, 
simply replace the impeller. Visit www.nkhome.com for information on the RH field-
calibration kit. The temperature sensor does not need to be recalibrated.

[email protected]

1.800.561.8187

www.

.com

Summary of Contents for Kestrel 3000

Page 1: ...nvironmental conditions wind speed wind chill maximum wind gust relative humidity average wind speed heat stress temperature air water snow dewpoint This instrument also features a data hold function...

Page 2: ...ll through the measurements in reverse order The instantaneous measurements will be displayed See Understanding the Measurements section for more information 5 Hold mode Press while holding to hold th...

Page 3: ...d since the unit was turned on Temperature instantaneous temperature of the thermistor which is located at the end of the long coiled leads in the open cavity below the impeller The exposed thermistor...

Page 4: ...oplock Then feed the lanyard end through the large opening in the over and out the slot Replace the poplock on the lanyard Replacing the Battery When your display becomes dim or disappears replace the...

Page 5: ...he unit down on a solid surface for several minutes to allow the sensor to adjust Replacing the Impeller Sensors Calibration Kestrel Pocket Weather Meters use precision sensors to measure the environm...

Page 6: ...product or part when notified within the warranty period and will return the product via domestic ground shipping or NK s choice of method of international shipping at no charge The following shall be...

Page 7: ...on the replacement product Our Customer Care Program applies only as long as we manufacture the product CALIBRATIONS CERTIFICATIONS AND SERVICE Every NK product is tested and calibrated before it leav...

Page 8: ...5 outside of the USA Monday to Friday 9 to 5 ADDITIONAL INFORMATION What is a Kestrel The American Kestrel is the smallest North American falcon Beautiful and highly adaptable it can be found virtuall...

Page 9: ...r Kestrel Pocket Weather Meter online at www kestrelweather com NIELSEN KELLERMAN 21 Creek Circle Boothwyn PA 19061 Phone 610 447 1555 Fax 610 447 1577 Web www kestrelweather com Email kestrel nkhome...

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