background image

®

Wireless Weather Sensor with GPS

Wireless GPS Sensor

6

013-15518A

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 Temperature in °C.

Dew Point

Dew Point is the temperature to which air must be 

cooled at constant pressure for water vapor to 

condense. Dew Point is reported as a temperature on 

the Celsius and Fahrenheit scales. The sensor 

calculates Dew Point (in °C) with the formula:

In this formula, 

is the 

saturation water vapor pressure, RH is Relative 

Humidity (as a percentage), and T is Temperature in °C. 

Wind Chill

Wind Chill (or Wind Chill Index) indicates a combined 

effect of temperature 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.

Heat Stress Index (Humidex)

Heat Stress Index (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 °C) using the 

formula:

where T is ambient air temperature in °C, and e is the 

water vapor pressure in kPa.

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 pressure (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 calculator 

of the data collection software.

Wireless GPS Sensor

The Wireless GPS Sensor uses signals received from 

the Global Positioning System (GPS) to determine its 

latitude, longitude, altitude and horizontal velocity 

anywhere on earth. Use it alone or in conjunction with 

other sensors for outdoor experiments in environmental 

science, physics, and other subjects.

Data from the Wireless GPS Sensor is relayed by Blue

-

tooth to the PASCO data collection software on a com

-

puting device such as a computer or tablet.

Theory of Operation

To determine its 

position, the sensor 

must receive data from 

at least three satellites. 

When the sensor is first 

powered on, it searches 

the sky for available 

satellites. This process 

typically takes between 

30 seconds and 2 

minutes. Once 

satellites have been 

identified, the sensor 

actively tracks them 

and acquires new 

satellites as they come 

into view.

The Wireless GPS Sensor performs best outdoors with a 

clear view of the sky.

Absolute Humidity

13.24 RH

T

273.15

+

----------------------------

17.42

T

T

239.7

+

-----------------------

exp

=

Dew Point

430.22

237.7

SatVP RH

100

-----------------------------

ln

+

SatVP RH

100

-----------------------------

ln

19.08

+

----------------------------------------------------------------------------------------

=

SatVP

6.11

7.75

T

237.7

T

+

10

=

Wind Chill (°F)

35.74 0.6215

T

35.75

V

0.16

0.4275

T

0.16

+

+

=

A

C

1.3

0.92

T

+

2.2

e

-------------------------------------

=

Содержание PS-3209

Страница 1: ...rence Guide 013 15518A Wireless Weather Sensor with GPS PS 3209 Included Equipment Item Included Equipment Item Wireless Weather Sensor with GPS 1 USB to Micro USB Cable 2 2 1 1 2 Weather Resistant Ga...

Страница 2: ...s a rechargeable battery pack The sensor measures wind speed wind direction barometric pressure humidity ambient temperature light level UV index and magnetic heading The GPS module reports latitude l...

Страница 3: ...ll continue to blink red This indicates that the device is ready to connect to GPS sat ellites and connect wirelessly via Bluetooth to a comput ing device such as a computer or tablet To turn off the...

Страница 4: ...S and the Battery Status LEDs operate as follows depending on the type of connection For a connection to the USB Charger or a USB Port For a wireless Bluetooth connection Using the Weather Sensor The...

Страница 5: ...measured in units of m s cm s mm min km h mph miles per hour knots and ft s feet per second CAUTION Do not try to measure high speed wind such as from leaf blowers or severe storms Temperature Temper...

Страница 6: ...r vapor pressure in kPa 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...

Страница 7: ...llites again Wireless Light Sensor The Wireless Light Sensor measures illuminance mea sured in lux or lumen per square meter and ultra violet index UVI For greatest accuracy make sure that the white d...

Страница 8: ...your responsibility to recycle your electronic equipment per your local environmental laws and regulations to ensure that it will be recycled in a manner that protects human health and the environmen...

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