Kestrel 3500 Measures
Heat stress index
Wet bulb temperature
Air , water , and snow temperature
Current wind speed
Average wind speed
Maximum wind gust
Many Kestrel users need to know everything that the weather is doing, but don't need to log the data. We developed the Kestrel 3500 just for them. It provides comprehensive environmental data on nine different measurements with the simplicity of the Kestrel 1000 . Simply turn it on and scroll left and right to see exactly what the environment is doing. When you're done, slip on the hard cover and your Kestrel 3500 Pocket Wind Meter is just about indestructible.
While the weather can dictate the comfort level of individuals working or playing outside, it plays an even bigger part in many professionals' jobs. Irrigation professionals use the Kestrel 3500 to ensure they are irrigating efficiently and the water they are dispersing is actually hitting their intended target, and not evaporating or blowing away. And on construction sites Kestrel users are preventing plastic shrinkage cracks and curing concrete more effectively with their Kestrel 3500.
Available in the Night Vision Configuration
Military personnel and pilots flying in darkness are often concerned with preserving their night vision. Due to overwhelming demand from our military customers, the Kestrel NV line was added in 2005.
The Kestrel 3500NV has a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Additionally, NV backlights are also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations. This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.
It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night vision. Even a short burst of white, yellow, green or blue light “bleaches out” the rod cell photoreceptors in the eye and causes night blindness until the entire adaptation process can take place again. Light in the red spectrum does not cause this “bleaching out”, preventing night blindness and night vision fatigue.
Kestrel 3500 Features
Waterproof and floats
Large easy-to-read display with backlight
Data hold function
High precision pressure sensor
Quick response, external thermistor
Forecast weather with pressure trend indicator
Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
Innovative, thermally adjusted humidity sensordesigned for stability and accuracy in abrupt condition changes
Patented user-replaceable impeller
Reliable, portable and easy to use
Protective cover with sure-grip overmolding
All instruments and accessories are completely assembled in the USA
Kestrel 3500 Includes
A slip-on protective cover
CR2032 coin cell battery (Average life 300 hours)
Kestrel Certificate of Conformity
|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).|
|°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.|
|%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).|
(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.|
|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 |
|°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 |
|°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.) |
|°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.|
|One-button clear and restart of Max Wind Gust and Average Wind measurement.|
|Pressure Trend||Continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly.|
|Display||Reflective 4 digit LCD. Digit height 0.36 in / 9 mm.|
|Display Update||1 second.|
|Display Backlight||Aviation green electroluminescent backlight.|
|Clock / Calendar||Real-time hours:minutes clock.|
|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.|
|After 45 minutes of no key presses.|
|Certifications||CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge). |
|Batteries||CR2032, one, included. Average life, 300 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 4.8 x 1.7 x 0.7 in / 122 x 42 x 18 mm. Case 4.8 x 1.9 x 1.1 in / 122 x 48 x 28 mm.|
|Weight||Unit 2.3 oz / 65 g. Case 1.3 oz / 37 g.|
This sturdy padded nylon case lets you build
a Kestrel 4000 Toolkit perfect for your needs and still carry it on your
belt with ease. The top flap...
Replacement impeller for all Kestrel models.
Simply presses out, no tools required to change.
New for Spring 2008! A tripod fitted with
the same Kestrel friendly clamp as on our mini tripod. Will accommodate
any Kestrel model. Or remove the...
Clamp any Kestrel into this sturdy but lightweight
tripod to take readings in the field. The tripod?s legs extend to permit
a maximum height of 10",...
The Kestrel Portable Vane Mount is an ingeniously
simple accessory designed for extreme light weight and portability. The
Vane Mount assembles in...
The RH calibration kit includes the following
items: three clear, sealable containers one container with magnesium chloride
solution one container...
This product was added to our catalog on Thursday 16 July, 2009.