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CHAPTER 3: MINIDOT CLEAR LOGGER
3.1 Overview
All miniDOT Clear Logger measurements are saved in files on the SD card inside the miniDOT Clear
Logger. The files are transferred to a HOST computer via a USB connection where the miniDOT
Clear Logger appears as a “thumb drive”. Measurements may be plotted by the miniDOT Plot
program and files concatenated by the miniDOT Concatenate program. The miniDOT Clear Logger
itself is controlled by the miniDOT Control program. Customers are required to open the logger each
time measurements are transferred to the HOST computer. This chapter describes the miniDOT
Clear Logger’s internal features.
3.2 Opening and Closing the miniDOT Clear Logger
The miniDOT Clear Logger’s circuitry is contained in a clear waterproof housing that must be
opened. Unscrewing the clear pressure housing from the black end cap opens the miniDOT Clear
Logger. This is like opening a flashlight. Turn the clear pressure housing counterclockwise relative to
the black end cap. Close the miniDOT Clear Logger by reversing this procedure after being sure that
the o-ring is free from debris. If debris is found, then wipe it off with a clean lint free cloth. PME
recommends Kimtech Kimwipes for this application. Next, re-lubricate the o-ring with silicone grease
or oil intended for buna-N o-ring material.
Please attempt to handle the miniDOT Clear Logger by only touching the aluminum chassis. Try not
to touch the circuit board.
When closing the miniDOT Clear Logger, inspect the o-ring and the interior of the clear pressure
housing for debris. Lubricate the o-ring, and screw the clear pressure housing onto the black end
cap until the clear pressure housing just touches the black end cap. Do not tighten! The miniDOT
Clear Logger tends to get a little tighter during deployment.
If you cannot open the miniDOT Clear Logger by yourself, then find another person with strong
hands. This person should grip the black end cap while the other person turns the clear pressure
housing.
Caution: Do NOT remove the stainless screws in the black end cap. If this is done, then the miniDOT Clear Logger
will be permanently damaged and must be returned for repair.
