WEATHERPAK
®
TRx
USER’S MANUAL
P/N: 0302-109-011 Rev. B
13
Figure 9. ALOHA screen capture
The WEATHERPAK
takes a sensor sample approximately every 1-2 seconds and calculates a five minute running
average and sends updated data approximately every thirty seconds. “INSTANTANEOUS” data is captured just
prior to the thirty-second update. By comparing the “5 MINUTE RUNNING AVERAGE” and
“INSTANTANEOUS” data, the user can get a good idea of changing conditions. The WEATHERPAK
calculates
“Sigma Theta”, or air mixing, and produces a Stability Class value used by the plume model. The battery voltage is
also transmitted. Note: If voltage is below 11.0 the batteries in the WEATHERPAK
tower should be replaced.
Figure 10. ALOHA map