PASCO PS-2174 Weather_Anemometer Sensor - Manual (Page 4)

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W e a t h e r / A n e m o m e t e r S e n s o r P S - 2 1 7 4
4
where is the saturation
water vapor pressure, RH is Relative Humidity (as a percentage),
and T is Temperature in °C.
Absolute Humidity Absolute Humidity is a measure of the
mass of water vapor present in a given volume. It is reported in
units of g/m
3 . The sensor calculates Absolute Humidity with the
formula:
Where RH is Relative Humidity (as a percentage), and T is Tem-
perature in °C.
Wind Chill Wind Chill indicates a combined effect of temper-
ature and wind speed. It is reported as an apparent temperature on
the Celsius and Fahrenheit scales. The sensor calculates Wind
Chill (in °F) using the formula:
where T is air temperature (in °F) and V is wind speed (in miles
per hour).
Wind Chill is defined for temperatures at or below 50° F and
wind speed above 3 miles per hour; outside of those limits, the
sensor reports a value equal to Air Temperature.
Humidex Humidex indicates a combined effect of temperature
and humidity. It is reported as an apparent temperature on the
Celsius and Fahrenheit scales. The sensor calculates Humidex (in
°F) using the formula:
where T it temperature in °C, and e is the water vapor pressure in
mbar.
Sea-level Corrected Pressure
A typical weather station does not report the actual measured
barometric pressure. Rather, it reports a “sea-level corrected”
value. Use this formula to calculate the sea-level corrected pres-
sure (in mbar):
[Barometric Pressure (mbar)]+1013*(1-exp(-h/7000))
where h is the sensor’s elevation in m. To have this calculation
done automatically, enter it in the DataStudio calculator or GLX
Calculator screen.
Specifications
Compatible Interfaces
The Weather/Anemometer Sensor is compatible with all wired
PASPORT interfaces and loggers including USB Link (PS-2100),
Xplorer (PS-2000), PowerLink (PS-2001), and Xplorer GLX
(PS-2002).
For wireless use, the Weather/Anemometer Sensor is compatible
with AirLink SI model PS-2005A. It is not compatible with
model PS-2005.
Technical Support
For assistance with any PASCO product, contact PASCO at:
Limited Warranty For a description of the product warranty, see the
PASCO catalog.
Copyright
The PASCO scientific 012-09911D Weather/Anemometer
Sensor Instruction Sheet is copyrighted with all rights reserved. Permis-
sion is granted to non-profit educational institutions for reproduction of any
part of this manual, providing the reproductions are used only in their labo-
ratories and classrooms, and are not sold for profit. Reproduction under
any other circumstances, without the written consent of PASCO scientific,
is prohibited.
Trademarks
PASCO, PASCO scientific, DataStudio, ScienceWorkshop,
Xplorer and Xplorer GLX are trademarks or registered trademarks of
PASCO scientific, in the United States and/or in other countries. All other
brands, products, or service names are or may be trademarks or service
marks of, and are used to identify, products or services of, their respective
owners. For more information visit www.pasco.com/legal.
SatVP 6.11
7.75 T 237.7 T +
   
10
=
Absolute Humidity
13.24 RH 
T 273.15 +
----------------------------
17.42T
T 239.7 +
-----------------------
 
 
exp 
=
Wind Chill (°F) 35.74 0.6215T 35.75V
0.16
– 0.4275T
0.16
+ + =
Humidex T
5
9
--- e 10
–
 
+ =
Measurement Range Resolution Accuracy
(% of reading)
Wind Speed 0.5 to 29 m/s 0.1 m/s ±(3% of reading
+ 0.2 m/s)
Temperature -20 to 55 °C 0.1 °C ±0.5 °C
Relative
Humidity 0 to 100% 1% ±2%
Barometric
Pressure 150 to 1150 hPa 0.03 hPa 1 hPa
Address: PASCO scientific
10101 Foothills Blvd.
Roseville, CA 95747-7100
Phone: 916-786-3800 (worldwide)
800-772-8700 (U.S.)
Fax: (916) 786-7565
Web: www.pasco.com
Email: [email protected]