Coastal WEATHERPAK TRx2 Manuale d'uso - Pagina 11

Sfoglia online o scarica il pdf Manuale d'uso per Stazione meteorologica Coastal WEATHERPAK TRx2. Coastal WEATHERPAK TRx2 18.

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 the "INSTANTANEOUS" data, every thirty seconds to the receiver and subsequently the plume

model. In addition, the WEATHERPAK

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.

Voltage is the tripod battery voltage. When fresh batteries are installed, the reading will be 13.5

VDC (or higher). This number will go down slowly as the batteries are depleted. Batteries should

be replaced when this reading reaches 10.7 or lower

If you drop-down the [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,, 46, 2536

This is ASCll data being sent by the WEATHERPAK

appear in the "Processed Sam Data" dialog screen in ALOHA

labels and some additional number characters 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

transmitted.

P/N: 0302-117-002 Rev. C

Figure 5 - ALOHA

Plume

calculates Sigma Theta. This is a measurement of air

The battery voltage is also transmitted.



. Notice that most of these numbers will

WEATHERPAK

User's Manual

. The difference is that there are no

TRx 2

Battery