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. 2018 Feb 9;18(2):530. doi: 10.3390/s18020530

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Alternative physical arrangements of the same electronic components: (a) Surface logger configuration: components are mounted on a 4 inch ABS knockout cap with double sided tape. The RTC board is supported by 12 mm M2 nylon standoffs. (b) Submersible logger configuration: components are re-arranged to fit inside a 2 inch diameter pipe housing. Double-sided tape attaches the modules to an L bracket made from thin ABS plastic that is solvent welded to a 2 inch knockout cap. Wires pass through holes in the bracket to connect components on opposite sides. The battery pack shown has two banks of 3 × AA batteries in series, which are isolated from each other with Shottky diodes.