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Kestrel Calibration Overview
Kestrel knows how important it is for their customers to be able to trust their instruments to provide them with reliable and accurate measurements. Many of our customers rely on their Kestrel’s readings to make decisions about how to do their jobs safely and effectively. Every Kestrel is factory tested and verified to be within specification before being shipped. A Certificate of Conformity documenting these tests is included with every Kestrel unit. All of our calibration standards are traceable to the National Institute of Standards and Technology (NIST), ensuring the highest level of reliability. Our wind/airflow standard is actually calibrated in the NIST laser doppler wind tunnel as this is the only lab in the country that can provide the calibration accuracy we require. We offer four types of calibration services to meet the accuracy validation needs of our customers:
NIST Calibration at Time of Purchase: At time of purchase, you may need full calibration detailing the comparison of your purchased unit to our NIST-traceable standard. For this purpose, you will select NIST calibration services for each sensor you require and add them to the cart at the time of purchase. There is no need to provide a serial number. We will perform the calibration services and include the NIST Calibration Report and Certificate with your delivery. NOTE: NIST Calibration at time of purchase will add 3-5 days lead time to the ship date for your product.
NIST Calibration after Purchase: At a recommended or industry-required time interval, you may need full calibration detailing the comparison of your Kestrel’s measurements to our NIST-traceable standard. For this purpose, you will want to add NIST calibration services for each sensor you require, provide us with the serial number of the unit to be calibrated and the name for the calibration certificate, and return the unit to us. We will perform the calibration services and prepare NIST Calibration Report and Certificate detailing as found and as left values, observed values from the traceable calibration standard, acceptable performance range, and deviation from standard. If required and available for the sensor in question, we will also restore your unit’s performance to specification by replacing the sensor or entering a calibration adjustment. See the table below for details.
Factory Calibration after Purchase: At any time after purchase, you may simply wish to have the Kestrel’s performance verified to be within specification, without requiring a detailed certificate. For this purpose, select Factory Calibration services for each sensor you require, provide us with the serial number of the unit, and return the unit to us. We will perform the same tests performed on your unit when it was manufactured and provide a renewed Certificate of Conformity confirming performance within specification, the serial number of the unit, and the signature of the testing agent. If needed and available for the sensor in question, we will also restore your unit’s performance to specification by replacing the sensor or entering a correction. See the table below for details.
Calibration Services in Detail:
|Measurement||NIST Calibration Points||Factory Calibration Points||Models||Correction Included?|
|Wind Speed / Air Flow||~ 600 fpm
~ 1200 fpm
|~ 300 fpm
~ 1200 fpm
|All Kestrel Meters||Yes - Impeller will be replaced with a new calibrated impeller if required.|
|2000 and above DROP||No - Temperature sensor reading is not correctable. However, it is rare for this sensor to drift out of specification.|
|Black Globe Temperature||-10°C
|No - Temperature sensor reading is not correctable. However, it is extremely rare for this sensor to drift out of specification.|
|Humidity||~ 33% Rh
~ 75% Rh
|~ 33% Rh
~ 75% Rh
|3000 & 3500
|Yes - Sensor will be corrected to perform within specification.|
DROP D2, D3
|No - Humidity sensor is not adjustable. However, it is rare for this sensor to drift out of specification. (Firmware revision may make sensor correction available in future.)|
Lower Limit Pressure
|2500 & 3500
|Yes - Sensor will be corrected.|
NIST Calibration will include a detailed, dated, unit-serialized, NIST Calibration Report and Certificate showing as found and as left values, standard values, acceptable range, and deviation. Factory Calibration will include a dated, signed Certificate of Conformity for the measurement(s) tested.
Turnaround for both NIST and Factory Calibration services is 5 days after receipt.
Tune-Up Services: Tune-ups include Factory Calibrations of all sensors on your unit as well as a new impeller, new battery, functional checks, cleaning and leak testing. Tune-Ups are priced at a flat $75 per unit so offer a great value if you need more than one Factory Calibration or just want to ensure your Kestrel is fully up to speed.
Shipping Your Unit: After completing your purchase, please note your order number so you can add it to the outside of the box. Please pack your Kestrel securely and ship to:
21 Creek Circle
Boothwyn, PA 19061
(NOTE: For both warranty and non-warranty repairs, we'll take care of return ground shipping at no charge to the US and Canada, but you are responsible for cost of shipping to NK. Expedited and overseas shipping is available at additional charge.)
You will also receive an email confirming these instructions. It is most important that we have your Order Number so we can promptly match your unit with your service request. You can also print your order confirmation and add it to the box.
Warranty Note: Every Kestrel is guaranteed to perform within specification, including the specified drift of the sensor in question, for FIVE YEARS from the date of manufacture or documented date of first customer purchase. If your Kestrel is under warranty and does not meet this standard under test, it will be repaired or replaced as covered under the terms of our Limited Warranty.
Questions or clarifications about our calibration services? Email Tech Support or call (610) 447-1555.
View a sample of the test report for NIST Calibrated units.
View a sample of a Cerificate of Conformity.
View our Tune-up product.
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