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Kestrel 3500 Delta T Pocket Weather Meter

£193.63 exVAT

£232.36 incVAT

The Kestrel 3500 Delta T meter allows you to accurately assess acceptable spraying conditions to ensure you’re within guidelines and help you select the right spray nozzle. (Delta T is the difference between wet bulb and dry bulb temperatures. It’s an accurate predictor of chemical evaporation rates). No other pocket weather meter offers this level of accuracy to arable farmers.

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Kestrel 1000 Kestrel 2000 Kestrel 2500 Kestrel 3000 Kestrel 3500 Kestrel 3500 Delta T Kestrel 5000 Kestrel 5100 Kestrel 5200 Kestrel 5400 Kestrel 5500 Kestrel 2700 Sportsman Elite Hornady 4DOF Kestrel 5700X
Functions / Model 1000 2000 2500 3000 3500 3500
Delta T
5000 5100 5200 5400 5500 2700
Ballistics
5700
Ballistics
5700
Elite AB
5700
4DOF
5700X
Elite AB
Price from(*) £78.56 £97.74 £155.28 £155.28 £193.63 £193.63 £260.75 £262.13 £261.85 £408.29 £337.47 £235.92
LiNK Model £318.29 £318.29 £318.29 £573.08 £404.59 £523.36 £814.79 £643.36 £987.64
NV Model Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Current Wind Speed Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Max Wind Gust Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Avg Wind Speed Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Temperature Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Lanyard Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Wind Chill Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Backlit Display Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Clock Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Pressure Trend Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Altitude Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Barometric Pressure Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Relative Humidity Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Heat Index Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Dew Point Temp Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Wet Bulb Temp Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Density Altitude Tick Tick Tick Tick Tick Tick Tick Tick Tick
Absolute Pressure Tick Tick Tick Tick Tick Tick Tick Tick Tick Tick
Exportable Data Logs Tick Tick Tick Tick Tick Tick Tick Tick Tick
Data Log Graphing Tick Tick Tick Tick Tick Tick Tick Tick Tick
Air Density Tick Tick
Humidity Ratio Tick Tick
Evaporation Rate Tick
Volume Air Flow Tick
Delta T Tick Tick Tick
Wet Bulb Globe Temp (WBGT) Tick Tick Tick
Thermal Work Limit Tick
Naturally Asp. Wet Bulb Temp Tick
Globe Temp Tick
Threshold Alerts Tick
Built in Flag Settings Tick
Digital Compass Tick Tick Tick Tick Tick Tick
Wind Direction Tick Tick Tick Tick Tick Tick
Crosswind Tick Tick Tick Tick Tick Tick
Headwind/Tailwind Tick Tick Tick Tick Tick Tick
Integrated Ballistics Calc Tick Tick Tick Tick
Enhanced Processor Speed Tick
Adjustable Bluetooth Signal Tick
Kestrel LiNK App (iOS) Tick Tick Tick Tick Tick Tick Tick Tick Tick
Kestrel LiNK App (Android) Tick Tick Tick Tick Tick Tick Tick Tick Tick
Kestrel LiNK for PC Tick Tick Tick Tick Tick Tick Tick Tick Tick
Kestrel LiNK Ballistics (iOS) Tick Tick Tick Tick
Kestrel LiNK Ballistics (Android) Tick Tick Tick Tick

* Prices exclude 20% VAT. UK mainland free delivery. For shipping within E.U. Please see our shipping terms

Kestrel 3500DT Measures

• Delta T
• Dew Point
• Heat Stress Index
• Relative Humidity
• Current Wind Speed / Maximum Wind Gust / Average Wind Speed (mph, km/h, ft/min, m/s, knots and Beaufort)
• Temperature / Wind Chill (Fahrenheit and Celsius)
• Barometric Pressure (inHg and hPa (mb))
• Pressure Trend
• Altitude (Feet and Meters)
• Wet Bulb Temperature (Psychrometric)

Product Description

It is critical to measure relative humidity, wind speed and wind direction in order to minimise waste and maximize safety when crop spraying. In hot, dry conditions, expensive chemicals may evaporate into the air rather than onto your crops. Delta T allows you to accurately assess acceptable spraying conditions to ensure you’re within guidelines and help you select the right spray nozzle. The Kestrel 3500 DT is the difference between wet bulb and dry bulb temperatures and is an accurate predictor of chemical evaporation rates. The Kestrel 3500 Delta T incorporates barometric pressure correction in its wet bulb temperature calculation, ensuring accuracy even on low pressure days, at high altitudes, and in very dry weather. No other pocket weather meter offers this feature with this level of accuracy.

Additional information

Functions:

Current Wind Speed, Max Wind Gust, Avg Wind Speed, Temperature, Lanyard, Backlit Display, Clock, Pressure Trend, Altitude, Barometric Pressure, Relative Humidity, Dew Point Temp, Wet Bulb Temp

Kestrel 3500DT Features

• Simple 3-Button Control
• Large easily read LCD display with backlight
• Standard user replaceable CR2032 Coin Cell Battery (Average Life 300 Hours)
• Data Hold Function
• Drop-Tested (MIL-STD-810F)
• Certificate of Conformity
• Neck Lanyard
• Patented Impeller and Sensor Technology (user-replaceable)
• Slip-On/Off Protective Cover
• Time of Day
• Waterproof & Floats
• 5 Year Warranty

Primary Measurement Units Resolution Accuracy
(+/-)
Range:
Max
Operational
Specification
(if less)
Notes
Wind Speed
or Air Velocity
m/s 0.1 Larger of 3% of reading, least significant digit or 20 ft/min 0.6 to 60.0 m/s
0.6 to 40.0 m/s
1 inch diameter impeller with precision axle and low-friction Zytel® bearings.
Start-up speed stated as lower limit, readings may be taken down to 0.4 m/s | 79 ft/min | 1.5 km/h | .9 mph | .8 kt after impeller start-up.
Off-axis accuracy -1% @ 5° off-axis; -2% @ 10° -3% @ 15°.
Calibration drift < 1% after 100 hours use at 16 MPH | 7 m/s.
Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753).
ft/min 1 18 to 11,811 ft/min
118 to 7,874 ft/min
km/h 0.1 2.2 to 216.0 km/h
2.2 to 144.0 km/h
mph 0.1 1.3 to 134.2 mph
1.3 to 89.5 mph
knots 0.1 1.2 to 116.6 knots
1.2 to 77.8 knots
Beaufort 1 0 to 12 B
Temperature °F 0.1 1.8 °F -49.0 to 257.0
-20.0 to 158.0
Air, water or snow temperature. Hermetically-sealed, precision thermistor mounted externally and thermally isolated (US Patent 5,939,645) for rapid response. Airflow of 2.2 mph | 1 m/s or greater provides fastest response and reduction of insulation effect. Calibration drift negligible.
°C 0.1 1.0 °C -45.0 to 125.0
-29.0 to 70.0
Relative Humidity %RH 0.1 3.0 %RH 0.0 to 100.0%
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 accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift +/- 2% over 24 months. RH may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit (NK PN-0802).
Pressure inHg 0.01 typical 0.04 inHg
max 0.07 inHg
0.30 to 32.48 inHg Air pressure at the location. Adjustable reference altitude allows display of station pressure or barometric pressure corrected to MSL. Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Pressure sensor may be recalibrated at factory or in field. Kestrel 2500 and 3500 display continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly. Kestrel 4000 series displays pressure trend through graphing function.
hPa (mb) 0.1 typical 1.5 hPa
max 2.5 hPa
300.0 to 1100.0 hPa 10.0 to 1100.0 hPa
Wet Bulb Temperature (Psychrometric) °F 0.1 3.6 °F Refer to stated ranges for temp., relative humidity and pressure. Temperature indicated by a wet bulb psychrometer under forced aspiration. Calculated from temperature, relative humidity and pressure.
°C 0.1 2.0 °C
Dewpoint °F 0.1 3.6 °F Refer to stated ranges for temp. and relative humidity. Temperature to which the air must be cooled at a constant pressure for water vapour to condense into water. Calculated from temperature and relative humidity.
°C 0.1 2.0 °C
Delta T °F 0.1 5.4 °F Refer to stated ranges for temp., relative humidity and pressure. Difference between dry bulb temperature and wet bulb temperature. When spraying, indicates evaporation rate and droplet lifetime. Safe range for pesticide spraying is 4 to 16 °F / 2 to 9 °C.
°C 0.1 3.0 °C
Altitude ft 1 typical 50 ft
max 98 ft
-2,300 to 85,000 ft Height above Mean Sea Level (“MSL”). Temperature compensated pressure (barometric) altimeter requires accurate reference barometric pressure to produce maximum absolute accuracy.
m 1 typical 15 m
max 30 m
-700 to 25,900 m
Max/Avg Wind One-button clear and restart of Max Wind Gust and Average Wind measurement by powering down and restarting unit.
Display & Backlight Reflective 5 digit LCD. Digit height 0.36 in / 9 mm. Choice of aviation green or visible red (NV models only) electroluminescent backlight. Manual activation with auto-off.
Response Time & Display Update All measurements except those based on relative humidity respond accurately within 1 second. Relative humidity and all measurements which include RH in their calculation may require as long as 1 minute to fully equilibrate to a large change in the measurement environment. Display updates every 1 second.
Clock / Calendar Real-time hours:minutes clock.
Operational & Storage Temperature Range The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Measurements beyond the operational range can be taken by briefly exposing unit to extreme conditions such that the display and batteries remain within the operational range. Storage range -22 °F to 140 °F / -30 °C to 60 °C.
Auto Shutdown After 45 minutes of no key presses.
Certifications CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).
Battery CR2032, one, included. Average life, 300 hours. Battery life reduced by backlight use in 2000 to 3500 models.
Environmental Waterproof (IP67 and NEMA-6). MIL-STD-810F, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller.
Size & Weight 4.8 x 1.9 x 1.1 in / 12.2 x 4.8 x 2.8 cm, 3.6 oz / 102 g (including slip-on cover).
Colour Options Yellow

The manufacturer reserves the right to amend the specification and therefore the information in this document may be subject to change.

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Data sheet
Download PDF Kestrel 3500 Delta T Data Sheet
User Instruction Manual
Download PDF Kestrel 3500 (English) Instruction Manual (2018 Edition)
Download PDF Kestrel 3500 (French) Instruction Manual
Download PDF Kestrel 3500 (German) Instruction Manual
Download PDF Kestrel 3500 (Italian) Instruction Manual
Download PDF Kestrel 3500 (Portuguese) Instruction Manual
Download PDF Kestrel 3500 (Spanish) Instruction Manual
Certificates of Conformity
Download PDF CE Marking – EC Declaration of Conformity
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