Specifications

Fig. 2.5: The Em50R from Decagon Devices.

2.5.4 Decagon Devices Incorporated

Decagon Devices Inc. [32], based in Pullman, Washington, has developed over 30 dif-

ferent devices, sensors, and controllers/loggers alike. This company specializes in providing

quality products at a competitive cost. Decagon has products available for the followin g

ﬁelds: food and pharmaceutical science, geotechnical and civil engineering, environmental

research, an d commercial irrigation.

Decagon has three loggers in its repertoire designated as Em50, Em50R, and the EM5b.

The Em50 and Em50R are identical except for the integrated radio on the EM50R. The

EM5b is meant to be an ultra low-cost solution for single site monitoring. After inspecting

these loggers, the Em50R, seen in ﬁ g. 2.5, was selected as the most applicable candidate

for multi-nodal data collection network. It comes in a NEMA rated enclosure to protect it

from the weather. The Em50R has ability to s tore 33,000 non-volatile sensor logs enabling

the logger to run for twelve months without overwriting old data. The logger has no

direct interface, but the PC interface is very easy to use and conﬁgu ration can b e setup

relatively quickly. The radio option for this logger requires further setup and coordination.