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Brand
New Item!
Kestrel
3500DT Pocket Weather
Meter for Agriculture
Features Include: Delta T, Current / Maximum / Average
Wind Speed, Air, Water & Snow Temperature, Dewpoint,
Barometric Pressure & Altitude
PN# 0835DT
Authorized Dealer
Assembled
in the USA!
5-year
limited warranty!
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To
ensure safety and effectiveness when spraying,
it is critical to measure relative humidity, wind
speed and wind direction. Many locales regulate
the maximum permitted wind speed during spraying
to minimize spray drift. In hot, dry conditions,
expensive chemicals may evaporate into the air
rather than onto your crops. However, you can
minimize costly evaporation by selecting an appropriate
nozzle and increasing the spray droplet size.
Quickly
& Accurately Calculates Delta T For You
The
Kestrel 3500 DT incorporates a Delta T calculation,
the spread between the wet bulb temperature and
the dry bulb temperature (in degrees C). Delta
T offers a quick guide to determining acceptable
spraying conditions. For example, it is not recommended
to apply pesticides when Delta T is above 10 —
a range of 2 to 8 is ideal. With the Kestrel 3500
Delta T, the calculation is done for you accurately
and simply.
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.
Certified
and Guaranteed Accuracy
Every single Kestrel manufactured at Nielsen-Kellerman
is calibrated for every single value, either directly
against NIST-traceable standards or against an
intermediary standard that is calibrated daily.
Every unit is shipped with a FREE Certificate
of Conformity that states what calibrations were
performed, and the certified performance specifications.
What does that mean for the customer?
They can be absolutely sure that their weather
readings are accurate to the stated specifications.
Some competing weather instruments claim the same
specifications as Kestrel, but only Kestrel certifies
their accuracy. What does that mean for the customer?
They can be absolutely sure that their weather
readings are accurate to the stated specifications.
Some competing weather instruments claim the same
specifications as Kestrel, but only Kestrel certifies
their accuracy.
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What
is Delta T?
The
Delta T is the spread between the wet bulb temperature
and the dry bulb temperature (in degrees C). Delta T offers
a quick guide to determining acceptable spraying conditions.
For example, it is not recommended to apply pesticides
when Delta T is above 10 - a range of 2 to 8 (degrees
C) is ideal.
Delta
T is a measurement used primarily by agriculture professionals
in Australia. Especially in very arid environments like
Australia, spray drift and evaporation is crucial to monitor.
Since the Delta T equation factors in the wet bulb temperature,
relative humidity is taken into account. The Delta T measurement
is therefore indicative of the evaporation rate and droplet
lifetime.
Spray
applicators must consider the environmental conditions
before and during application. Smaller droplets provide
better coverage than larger droplets. However, if the
droplets are too small for the weather conditions (i.e.
it's very dry or windy), they will evaporate before they
hit the intended plant. If the droplets are too large,
they may not provide sufficient coverage. Monitoring the
Delta T can help spray applicators decide if it's a good
time to spray, and also make appropriate nozzle selections.
With
the high value of many herbicides, pesticides, fertilizers,
etc, spray applicators need to make sure that the spray
is evenly and successfully reaching the target. Additionally,
this is of particular interest in irrigation systems.
With increasing scarcity of water resources, it's important
to ensure that the water is not evaporating before it
reaches the ground, that it's not blown away before hitting
the plants (spray drift).
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 the very dry weather when Delta T monitoring is
important. No other pocket weather meter offers this feature
with this level of accuracy.
Wet
bulb temperature is calculated from the relative humidity
and ambient temperature, both readings that a Kestrel
3000 + model will measure.
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Kestrel 3500DT Measures
-
Delta T
- Relative
humidity in %
- Altitude
-
Wind speed (current, average, and maximum)
- Dewpoint
- Wet
bulb temperature
- Temperature
of air, water & snow in °F or °C
- Barometric
pressure
Kestrel 3500DT Includes
-
A slip-on protective cover
- Neck
lanyard
- CR2032
coin cell battery (Average life 300 hours)
- Kestrel
Certificate of Conformity
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Kestrel 3500DT Features
-
Real-time clock
- Protective
cover with sure-grip overmolding
- Data
hold function
- Large
easy-to-read display with backlight
- Waterproof
and floats
- Measure
environmental conditions quickly and accurately
- Forecast
weather with pressure trend indicator
- Reliable,
portable and easy to use
- Innovative
humidity sensor designed for stability and accuracy
in abrupt condition changes
- Thermally
adjusted humidity sensor
- Patented
user-replaceable impeller
- Quick
response, external thermistor
- High
precision pressure sensor
- Humidity
sensor can be recalibrated in the field with our
Relative Humidity Calibration Kit.
- All
instruments and accessories are completely assembled
in the USA
- 5-year
warranty
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Measurement
Response Time |
Units |
Operational
Range |
Resolution |
Accuracy
(+/-) |
Specification
Range |
Wind
Speed
1 second |
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). |
Temperature
1 second |
°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. |
Relative
Humidity
1 minute |
%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). |
Pressure
1 second
(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. |
Altitude
1 second |
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. |
Dewpoint
1 minute |
°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. |
Max/Avg
Wind Speed |
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. |
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Auto
Shutdown
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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. |
| Kestrel
Meters are designed and manufactured at NK’s
facility in Boothwyn, Pennsylvania, and are individually
calibrated at the time of manufacture. Every Kestrel
Meter comes with a Certificate of Conformity to document
the unit’s accuracy—all Kestrel measurements
are traceable to the National Institute of Standards
and Technology, ensuring the highest level of reliability.
Additional NIST Calibration and Certification services
are available. |
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Every
item we list on Ebay is in our inventory. This is one of the many
reasons we remain popular with our customers. Most orders ship either
the same day or the following day after purchase. If for any reason
a product we have listed is not on our shelf, rather than have the
item ship to us from the manufacturer, for time considerations we
may elect to have the item ship direct to you. In this case the
shipping method may not be what was advertised.
Please
email us with any questions prior to purchase. Items are typically
sent out the following business day after payment clears. After
purchase, please click the "pay now" button to either
notify us of your method of payment or make an instant Paypal payment.
We accept credit card payments through Paypal. Shipments outside
of the USA: Duties, taxes, customs and all other government fees
are the responsibility of the buyer. PO BOXES OUTSIDE OF
THE USA: Please send us your phone number after purchase. It is
required on the customs forms and we cannot ship your item without
it. Pennsylvania customers: Optical Overstock is required
to charge a 6% sales tax to Pennsylvania customers only. Please
read the full description before bidding or purchase.
Warranty
and Returns:
If you find the product to be not as described in the listing or
not operational, contact us at your earliest convience. If we cannot
resolve the matter, We will issue a return merchandise authorization
number (RMA). If item is returned, return it at your cost within
fourteen (14) days in original, undamaged box and packing. Pending
inspection, your money will be fully refunded less all shipping
and handling charges or exchanged for another unit. Return shipping
charges are the responsibility of the customer.
After (14) Days
Nielsen-Kellerman
(Kestrel Meters) Plain Language Warranty Here.
Thank You for your interest!
Copyright 2009 Optical Overstock, LLC. All Rights Reserved
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