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Home > Products > Kestrel Hand-held Weather Meters > Kestrel 3500 > Specification
| Physical | Dimensions | 122mm x 42mm x 20mm | |
| Cover Dimensions | 122mm x 46mm x 26mm | ||
| Weight | 65g | ||
| Cover weight | 37g | ||
| Lanyard | 0.5m | ||
| Case colour | Yellow or olive drab for NV version | ||
| Display | Display type | Reflective 4 digit LCD | |
| Digit height | 9mm | ||
| Display update | 1 second | ||
| Functions [with on screen prompt] |
Current speed (3 second average) [SPd] | ||
| Average speed since power on (AVG) [SPd] | |||
| Maximum 3 second gust since power on (MAX) [SPd] | |||
| Temperature [deG] | |||
| Wind Chill [chill] | |||
| Relative humidity [r.h.] | |||
| Heat Index [H.I] | |||
| Dew point [d.P] | |||
| Wet bulb temperature [bulb] | |||
| Barometric pressure [bAro] | |||
| Altitude [ALt] | |||
| Data hold (HOLD) | |||
| Speed units | kt, m/s, km/h, mph, ft/min, Beaufort Force (B) | ||
| Temperature units | ºC, ºF | ||
| Relative humidity units | % | ||
| Pressure units | hPa, inHg | ||
| Altitude units | m, ft | ||
| Performance | Speed (1 sec response) |
Operational range | 0.4m/s to 60m/s (0.8 to 135.0mph) |
| Specification range | 0.4m/s to 40m/s (0.8 to 89.0mph) | ||
| On axis accuracy | Larger of ± 3% of reading or least significant digit. (Some loss of accuracy from bearing wear may occur with sustained operation at or near maximum speed) | ||
| Off axis response | -1% @ 5º, -2% @ 10º, -3% @ 15º | ||
| Calibration drift | <1% after 100hrs operation at 7m/s |
||
| Resolution | 0.1 kt, m/s, km/h, mph. 1 FPM below 1999 FPM, 10 FPM above 2000 FPM. 1 Beaufort (0 to 12) | ||
| Temperature (1 sec response) |
Operational range | -45.0ºC to +125.0ºC | |
| Specification range | -29.0ºC to +70.0ºC | ||
| Accuracy | ±1ºC | ||
| Resolution | 0.1º | ||
| Wind chill accuracy | ±1.0ºC (from wind speed and temperature) | ||
| Relative Humidity (1 min response) |
Operational range | 0% to 100% | |
| Specification range | 5% to 95% non-condensing | ||
| Accuracy | ± 3% (when unit allowed to equilibrate to external temperature) | ||
| Resolution | 0.1% | ||
| Calibration drift | ±2% over 24 months (correctable) | ||
| Heat index accuracy | ±2ºC (between 21.1ºC and 54.4ºC) | ||
| Dew point accuracy | ±2ºC (above 20% relative humidity) | ||
| Barometric Pressure (1 sec response) |
Operational range | 10 to 1100 hPa at 25ºC | |
| Specification range | 750 to 1100 hPa at 25ºC | ||
| Resolution | 0.1 hPa | ||
| Accuracy | ±1.5 hPa (max error over range 0ºC to 70ºC: ±2.0 hPa) | ||
| Calibration drift | Typically ±1 hPa per year (correctable) | ||
| Wet bulb temperature accuracy | ±2ºC (between 0ºC and 37.8ºC) | ||
| Altitude (1 sec response) |
Operational range | -500m to +9000m (-1500 ft to +30,000 ft) | |
| Specification range | -500m to +6000m at 25ºC | ||
| Accuracy | ±15m (max error out of spec range: ±30m) | ||
| Resolution | 1m or 1ft | ||
| Sensors | Impeller | Diameter 25mm High precision axle and jewel (sapphire) bearings User replaceable impeller assembly |
|
| Temperature | Thermally isolated, hermetically sealed precision thermistor | ||
| Relative Humidity | Polymer capacitive sensor, mounted externally in thin-walled chamber | ||
| Pressure | Monolithic piezo-resistive silicon based sensor with second-order temperature sensor | ||
| Environmental | Sealing | Electronics enclosure IP67 [Water
resistant] Floats |
|
| Shock | Drop tested (MIL.STD.810F - unit only) | ||
| Temperature | Operating range: -15ºC to +55ºC (for LCD
readability and batteries) Storage range: -30ºC to +60ºC |
||
| EMC | CE marked | ||
| Miscellaneous | Battery | Lithium coin cell CR2032, included, user replaceable | |
| Battery Life | 300 hours operation, typical ± depending on backlight use | ||
| Auto switch off | 45 minutes after last key press | ||
| Cover | Snap on hard cover for protection | ||
| Wind chill equivalent temperature calculation | Utilises the (US) NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results for wind speed measured at 10m above ground | ||
| Heat Index calculation | Steadman, from temperature and relative humidity | ||
| Certification | Wind speed, temperature, humidity and
pressure measurements are tested during
manufacture. A certificate of conformity (C of C) is included with each Kestrel. Calibration certificates are available for an additional fee. |
||
| Guarantee | 5 years | ||
| 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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