:: Product Information

Kestrel® 4200 Pocket Air Flow Tracker

NK

Kestrel 4200 Measures

Volume air flow in cfm, L/s, m³/s, m³/m, m³/h  
Air velocity (current, average, and maximum)  
Heat stress index
Windchill  
Relative humidity  
Dewpoint
Temperature in °F or °C  
Humidity ratio
Barometric pressure
Wet bulb temperature  
Altitude  
Density altitude

Tired of cumbersome equations to calculate CFM?

Like the 4100, the Kestrel 4200 has taken the calculations and guess-work out of air flow measurements with automatic air flow readings. The convenient averaging mode ensures accurate CFM readings in any airflow or duct size and shape. For immediate and accurate air flow readings, simply:

1.Enter the duct shape and dimensions.
2.Hold the 4200 in the air flow.
3.Volume air flow readings are displayed... no calculator required!

Innovative Design and Features

The Kestrel 4200 makes HVAC technicians jobs even easier with automatic wet bulb temperature and humidity ratio readings. Of particular interest to dehumidification professionals, the Kestrel 4200 measures relative humidity, dewpoint, wet bulb temperature and heat stress index as well as the humidity ratio—and the patented dual chamber humidity sensor assures fast and accurate readings in any environment. This multi-functional precision instrument also measures: volume air flow, air velocity, barometric pressure, altitude, wind chill, heat stress index, temperature, relative humidity and dewpoint, either ambient or in any accessible airflow.

Easy-to-Use Data Logging & Computer Upload

The Kestrel 4200 air flow meter features a powerful data logger that records 1600 sets of measurements at user-selectable time intervals (over 2 years of data can be recorded). Logged data can be reviewed with the 4200’s on-screen graphing capabilities, or uploaded to a PC for in-depth review. The optional Kestrel Interface and accompanying Kestrel Communicator software makes long-term storage, in-depth analysis and detailed charting of stored data a breeze.

With on-screen customization, the 4200 can truly be personalized for every technician. Easy set-up screens allow the unit to display only relevant readings, and hide screens not related to the job. Plus the Kestrel’s user screens group pertinent information on one easily referenced screen.

NIST-Traceable Accuracy

Don’t let the inexpensive price tag fool you — the Kestrel 4200 is as accurate as instruments costing far more. Every Kestrel is individually calibrated to NIST-traceable standards and comes with a free Certificate of Conformity. (Individual NIST certificates and recalibration are also available.) Consider the 4200’s hold and averaging functions, and it’s the only instrument HVAC technicians need to perform a variety of jobs.

Kestrel 4200 Features

Waterproof and floats
Backlight for low light conditions
Data Logger (automatic and manual)
Customizable data storage - 3600 data points
Minimum, Maximum and Average values
Multi-Function 3-line display
Data charting
Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
User-replaceable impeller
Flip-top impeller cover
Upload to a computer (with optional interface)
Five languages (English, French, Spanish, German, and Italian)
US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
5-year warranty
Assembled in the USA

Kestrel 4200 Includes

Soft carry pouch
Neck lanyard
Batteries - 2 AAA
Kestrel Certificate of Conformity

Specifications:

Measurement
Response Time

Units

Operational Range

Resolution

Accuracy (+/-)

Specification Range

Wind Speed
1 second  

m/s

0.4 to 60.0 m/s

0.1

Larger of 3% of reading or least significant digit

0.4 to 40.0 m/s

ft/min

59 to 11,948 ft/min

1

59 to 7877 ft/min

km/h

1.0 to 218.0 km/h

0.1

1.0 to 144.0 km/h

mph

0.8 to 135.0 mph

1

0.8 to 89.0 mph

knots

0.6 to 118.3 kt

0.1

0.6 to 78.0 kt

Beaufort

0 to 12 B

0.1

0 to 12 B

1 inch diameter impeller with precision axle and sapphire bearings.  Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º.  Calibration drift < 1% after 100 hours use at 16 MPH / 7 m/s.  Sustained operation above 60 MPH / 27 m/s will wear impeller rapidly and may cause destruction of impeller.  Replacement impeller (NK PN-0801) may be field-installed without tools (US Patent 5,783,753).

Air Flow
1 second  

cfm

0 to 99,999 cfm

1

3% of reading

0 to 99,999 cfm

m3/h

0 to 99,999 m3/h

1

0 to 99,999 m3/h

m3/m

0 to 99,999  m3/m

1

0 to 99,999  m3/m

m3/s

0.0 to 9,999.9 m3/s

0.1

0.0 to 9,999.9 m3/s

L/s

0 to 99,999 L/s

1

0 to 99,999 L/s

Automatically calculated from Air Velocity measurement and user-specified duct shape (circle or rectangle) and dimensions (units: in, ft, cm or m). Maximum duct dimension input: 258.0 in / 21.5 ft / 655.3 cm / 6.55 m.

Temperature  
1 second

°F

-49.0 to 257.0 °F

0.1

1.8 °F

-20.0 to 158.0 °F

°C

-45.0 to 125.0 °C

0.1

1.0 °C

-29.0 to 70.0 °C

Measures air, water and snow temperature.  Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645).  Calibration drift negligible.

Relative Humidity
1 minute 

%RH

0.0 to 100.0 %

0.1

3.0 %RH

 5.0 to 95.0 % non-condensing

Polymer capacitive humidity sensor mounted in thin-walled chamber external to case for rapid, accurate response (US Patent 6,257,074).  (To achieve stated relative humidity accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and must be kept out of direct sunlight.)  Calibration drift +/- 2% over 24 months. Relative humidity may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit (NK PN-0802).

Pressure  
1 second  
(mb & PSI 4000 model only)

inHg

0.3 to 32.5 inHg

0.01

0.05 inHg

At 77.0 °F, 22.1 to 32.5 inHg

hPa / mb

10.0 to 1100.0 hPa / mb

0.1

1.5 hPa / mb

At 25.0 °C, 750 to 1100 hPa / mb

PSI

0.15 to 16.0 PSI

0.01

0.02 PSI

At 77.0 °F, 10.9 to 16.0 PSI

Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Maximum error over temperature range 32 to 158 °F (0 to 70°C) , +/- 0.06 inHg / +/-2.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sensor may be recalibrated at factory or in field.

Altitude  
1 second  

ft

-6000 to 30000 ft

1

50 ft

At 77.0 °F, <19,700 ft. Max error +/- 98 ft

m

-2000 to 9000 m

1

15 m

At 25.0 °C, <6,000 m.  Max error +/- 30 m

Temperature compensated pressure (barometric) altimeter. 

Wind Chill  
1 second  

°F

0.7 to 135.0 MPH, -49.0 to 257.0 °F

0.1

1.8 °F

1.8 to 89.0 mph, -50.0 to 50.0 °F

°C

0.4 to 60.0 m/s, -45.0 to 125.0 °C

0.1

1.0 °C

0.4 to 40 m/s, -45.6 to 10.0 °C

Calculated from the primary measurements of wind speed and temperature.  Utilizes the NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results to wind speed measured at 10 m above ground.  (Specification temperature limits established by WCT Tables.)

Heat Index  
1 minute  

°F

0.0 to 100.0 %RH, -49.0 to 257.0 °F

0.1

3.6 °F

70.0 to 130.0 °F, 0 to 100% RH

°C

0.0 to 100.0 %RH, -45.0 to 125.0 °C

0.1

2.0 °C

21.1 to 54.4 °C, 0 to 100 %RH

Calculated from the primary measurements of temperature and relative humidity.  Utilizes the NWS Heat Index (HI) tables.  (Specification temperature limits established by HI tables.) 

Dewpoint  
1 minute  

°F

0.0 to 100.0 %RH, -49.0 to 257.0 °F

0.1

3.6 °F

-20.0 to 158.0 °F, 20.0 to 95.0% RH

°C

0.0 to 100.0 %RH, -45.0 to 125.0 °C

0.1

2.0 °C

-29.0 to 70.0 °C, 20.0 to 95.0 %RH

Calculated from the primary measurements of temperature and relative humidity. Temperature to which the air would need to be cooled at a constant pressure to become saturated.

Wet Bulb Temperature
1 minute  

°F

-49.0 to 257.0 °F, 0.0 to 100.0 %RH, 8.86 to 32.48 inHg

0.1

3.6 °F

32.0 to 100.0 °F, 5.0 to 95.0% RH, 8.86 to 32.48 inHg, <19700 ft

°C

-45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa

0.1

2.0 °C

0.0 to 37.8 °C, 5.0 to 95.0 %RH, -2000.0 to 9000.0 hPa, <6000 m

Calculated from the primary measurements of temperature, relative humidity and pressure. Temperature indicated by a wet bulb psychrometer.

Humidity Ratio
1 minute  

gpp

0.000 to 5000.0 gpp

0.1

typical accuracy 10%

-20 to 130°F, 5 to 95% RH, 8.86 to 32.48 inHg

g/kg

0.00 to 720.0 g/kg

0.01

typical accuracy 10%

-29 to 54°C, 5 to 95% RH, 300.0 to 1100.0 hPa

Calculated from the primary measurements of temperature, relative humidity and pressure. The measure of Grains/lb of dry air, called the humidity ratio, is an indication of the mass of water vapor in air.

Density Altitude 
1 second  

ft

-49.0 to 257.0 °F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg

1

246

32.0 to 100.0 °F, 5.0 to 95.0 %RH, 8.86 to 32.48 inHg, <19700 ft

m

-45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa

1

75

0.0 - 37.8 °C, 5.0 to 95.0 %RH, -2000 to 9000 hPa, <6000 m

Calculated from the primary measurements of temperature, relative humidity and pressure.  Air density converted to equivalent sea level elevation at the International Standard Atmosphere.

Max/Avg Wind Speed (Air Velocity),
Crosswind, Headwind/Tailwind

One-button clear and restart of Max Wind Gust and Average Wind measurement.

Data Storage / Display

Minimum, maximum, average and logged history stored and displayed for every measured value. 3200-point data logger with graphical display. Auto data storage; interval settable from 2 seconds to 12 hours. Manual data capture.  

Data Upload

Requires optional PC interface (NK PN-0830) and provided software. RS-232 connection with USB adapter available.

Display

Multifunction, multi-digit programmable dot-matrix display.

Display Update

1 second.

Display Backlight

Choice of aviation green or visible red electroluminescent backlight. Automatic or manual activation.

Clock / Calendar

Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment.

Operational Temperature Range
(LCD and Batteries)

The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Beyond the limits of the operational temperature range, the unit must be maintained within range and exposed for minimum time necessary to take reading.

Storage Temperature

-22 °F to 140 °F / -30 °C to 60 °C.

Auto Shutdown

User-selectable:  15 or 60 minutes with no key presses or disabled.

Languages

English, French, German, Italian, Spanish.

Certifications

CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).  

Batteries

AAA Alkaline, two, included. Average life, 400 hours of use, +/-depending on backlight use.

Environmental

Waterproof (IP67 standard). Drop-tested (MIL.STD.810F; unit only. Substantial impact may damage replaceable impeller.).

Dimensions

Unit 5.0 x 1.8 x 1.1 in / 12.7 x 4.5 x 2.8 cm.

Weight

Unit 3.6 oz / 102 g.

Kestrel Meters are designed and manufactured at NK’s facility in Boothwyn, Pennsylvania, and are individually calibrated at the time of manufacture. Every Kestrel Meter comes with a Certificate of Conformity to document the unit’s accuracy—all Kestrel measurements are traceable to the National Institute of Standards and Technology, ensuring the highest level of reliability. Additional NIST Calibration and Certification services are available.

Producing Area:USA

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