Coastal WEATHERPAK MTR Manual del usuario - Página 17

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10. Select the [Sharing] drop-down menu to plot the plume onto a MARPLOT

conditions change, the plume size and position will change on the map, shortly after the WEATHERPAK

provides updated data. Note: MARPLOT

in order for the map-plume to update automatically. (See Figure 12.)

WEATHERPAK

reads the sensors every second and automatically applies an algorithm to the sensor data to calculate

five-minute running averages. This calculated data is transmitted, along with "INSTANTANEOUS" data, every thirty

seconds to the Receiver/Display and subsequently the plume model. In addition, the WEATHERPAK

Theta. This is a measurement of air turbulence, which affects the mixing or dispersion of a chemical in the atmosphere.

Sigma Theta is also referred to as "Stability."

The "INSTANTANEOUS" data is the last direct sensor reading prior to the thirty-second update. The operator may be

able to detect a trend (i.e. wind shift) by comparing the "5 MINUTE RUNNING AVERAGE" and "INSTANTANEOUS" data.

The battery voltage is also transmitted. Please Note: If the battery voltage falls below 10.7 VDC, the batteries in the

WEATHERPAK

tower should be replaced.

If you drop-down [SAM Options] from the Main menu and select [Raw Data], something like the following line of data will

appear:

421, 0.9, 225, 1.0, 23.9, 1.0, 226, 23.9, 14.0, 1917, 999, 46, 2536

This is ASCll data being sent by the WEATHERPAK

Sam Data" dialog screen in ALOHA

are present. In addition, this raw data is delivered in Metric units (millibars, m/s, C), whereas the processed data has

been converted to Standard English units (inches, MPH, F).

Two "checksums" are performed to ensure that the message was sent correctly. The computer adds up the "ASCII

value" of the data line (each letter, number, comma, etc., has a numerical value universal to all computers) to make sure

that the computer received the same number that the WEATHERPAK

P/N: 0302-140-001 Rev. D

software requires that the ALOHA

Figure 12 - ALOHA

with MARPLOT



. Notice that most of these numbers will appear in the "Processed

. The difference is that there are no labels and some additional number characters

WEATHERPAK

(or other) map. As weather

window overlay the map window

Map



transmitted.

MTR

User's Manual

calculates Sigma