Kestrel 3500DT Delta-T Weather Meter
Kestrel
Minimize waste and maximize safety with the Kestrel 3500 Delta T Crop Spraying Meter
Delta T 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.)
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 when Delta T monitoring is important. No other pocket weather meter offers this feature with this level of accuracy.
Environmental Measures:
- Current Wind Speed
- Maximum Wind Gust
- Average Wind Speed
- Temperature
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Altitude (Pressure Based)
- Barometric Pressure
- Dew Point
- Wet Bulb Temperature (Psychrometric)
- Pressure Trend
- Relative Humidity
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Delta T
Features:
- Simple 3-Button Control
- High Contrast, Sunlight Readable Monochrome LCD Display
- Backlight (Blue white)
- Temperature Sensor (Patented External Isolated)
- CR2032 Coin Cell Battery (Average Life 300 Hours)
- Data Hold Function
- Drop-Tested to MIL-STD-810G
- Waterproof to IP67 (3'/1M for 30 minutes)
- Kestrel Certificate of Conformity
- Neck Lanyard
- Patented Impeller and Sensor Technology
- Slip-On Protective Cover
- Time of Day
- User-Replaceable Batteries
- User-Replaceable Impeller
- Waterproof & Floats
- Designed and built in the USA
Physical Specifications
- Dimensions: 4.8 x 1.7 x 0.7 in. / 122 x 42 x 18 mm
- Weight: 2.3 Ounces / 65 Grams
- MFG Part# 0835DT, Model# 3500DT (Yellow)
Features
Wind Speed, Temperature, Barometric Pressure, Relative Humidity, Wind Chill, Heat Stress Index, Dew Point Temperature, Altitude (Barometric), Wet Bulb Temperature (Psychrometric), and Delta-T
Includes
(1) CR2032 Lithium Battery, Instructions, Lanyard, Certificate Of Conformity (Spec Sheet), and Protective Cover - Hard Slip-on
Kestrel 3500DT Delta T Weather Meter Sensor Specifications
Sensor Specifications
Wind Speed |
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| Units of Measure: | mph | kt | B | m/s | ft/min / km/h |
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| Accuracy (+/-): | Larger of 3% of reading, least significant digit or 20 ft/min |
| Notes: | 1 inch|25 mm diameter impeller with precision axle and low-friction Zytel® bearings. Startup 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 startup. Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH | 7 m/s. Replacement impeller (PN-0801) field installs without tools (US Patent 5,783,753). Wind speed calibration and testing should be done with triangle on impeller located at the top front face of the Kestrel. *F/S only in Ballistics units. Beaufort not available in Ballistics units. |
Ambient Temperature |
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| Units of Measure: | Fahrenheit, Celsius |
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| Notes: | 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 insolation effect. Calibration drift negligible. Thermistor may also be used to measure temperature of water or snow by submerging thermistor portion into material -- remove impeller prior to taking submerged measurements and ensure humidity sensor membrane is free of liquid water prior to taking humidity-based measurements after submersion. |
Pressure |
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| Units of Measure: | inHg, hPA, mb |
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| Notes: | Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product. |
Relative Humidity |
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| Units of Measure: | % |
| Specification Range: | 5 to 95% 25°C non-condensing |
| Operational Range: | 0 to 100% |
| Resolution: | 0.1 %RH |
| Accuracy (+/-): | 3%RH |
| Notes: | 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 is typically less than ±0.25% per year. |
Calculated Measurements
Barometric Pressure: |
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Altitude |
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Dew Point |
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| Accuracy (+/-): |
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Wet Bulb Temperature - Psychrometric: |
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| Accuracy (+/-): |
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Delta T |
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| Accuracy (+/-): |
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