Hardware Reference
In-Depth Information
Photo 12.3 Lascar's EasyLog USB data logger
data to assess the effectiveness of various heating and ventilation solutions.
The sensors must be left in position for long periods (usually between 2 and 6
weeks) and data must be sampled throughout this period at intervals of 5 min,
or less.
Specification
The temperatures collected are to be in the range 20 Cto + 50 C with a
resolution of 0.5 C and an accuracy of 1 C. Because sensing devices are to
be purchased and deployed in quantity (between 10 and 40 sensors per project)
sensors must be low cost and require minimal effort in deployment.
Hardware
The Lascar USB data logger was chosen for this application (see Photo 12.3).
This is a low-cost device which is interfaced to a PC through a standard USB
port. Once set, the device can be removed from the PC and left in situ to collect
data.
The data logger measures and stores up to 16 382 temperature readings over
the range 25 Cto + 80 C( 13 Fto + 176 F). The data logger uses a long-
life 3.6 V lithium battery and will operate for approximately 12 months before
battery replacement is required. Logging rates can be set to 10 s, and 1, 5,
30 min, and 1, 6, 12 h. The data logger also offers high and low alarms (not
used in this application).
Software
Lascar's own data logging software was found to be perfectly adequate for this
application and no further bespoke software was required. Figures 12.16-12.19
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