Kestrel DROP Sensor Specifications

Sensor Specifications

Ambient Temperature

Units of Measure: Fahrenheit | Celsius
Specification Range:
  • 14 to 131°F
  • -10 to 55 °C
Operational Range:
  • 0° F to 140° F
  • -18 °C to 60 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Accuracy (+/-):
  • 0.9 °F
  • 0.5 °C
Notes: Airflow of 2.2 mph|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Battery Operational Temperature Limits.

Pressure:

Units of Measure: inHg, hPA, mb
Specification Range:
  • 25°C/77°F
  • 700-1100 hPa|mbar
  • 20.67-32.48 inHg
  • 10.15-15.95 PSI
Resolution:
  • 0.1 hPa|mbar
  • 0.01 inHg
  • 0.01 PSI
Accuracy (+/-):
  • 1.5 hPa|mbar
  • 0.044 inHg
  • 0.022 PSI
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:

Units of Measure: %
Specification Range: 0 to 90% 25°C non-condensing
Resolution: 0.1 %RH
Accuracy (+/-): 2%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

Dew Point:

Accuracy (+/-):
  • 3.4 °F
  • 1.9 °C
  • 15-95% RH. Refer to Range for Temperature Sensor
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity

Wet Bulb Temperature - Psychrometric

Accuracy (+/-):
  • 3.2 °F
  • 1.8 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity
  • Pressure

Density Altitude:

Accuracy:
  • 226 ft
  • 69 m
Resolution:
  • 1ft
  • 1m
Sensors employed:
  • Temperature
  • Relative Humidity
  • Pressure

Heat Index:

Accuracy:
  • 7.1°F
  • 4.0°C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity

THI (NRC):

Accuracy:
  • 1.5 °F
  • 0.8 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity

THI (Yousef):

Accuracy:
  • 2.3 °F
  • 1.3 °C
Resolution:
  • 0.1 °F
  • 0.1 °C
Sensors employed:
  • Temperature
  • Relative Humidity

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