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PG. 9
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The miniDOT Clear Logger software creates 1 file daily on the miniDOT Clear Logger’s internal SD
card. The number of measurements in each file will depend upon the sample interval. Files are
named by the time of the first measurement within the file based on the miniDOT Clear Logger’s
internal clock and expressed in YYYY-MM-DD HHMMSSZ.txt format. For example, a file having the
first measurement on September 9, 2014 at 17:39:00 UTC will be named:
2 0 1 4 - 0 9 - 0 9 1 7 3 9 0 0 Z . t x t .
Files can be uploaded from the miniDOT Clear Logger by connecting it to a HOST computer. Use
the HOST computer’s copy/paste functions to move the files from the miniDOT Clear Logger to the
HOST computer.
Each measurement within the files has a time stamp. The time stamp format is Unix Epoch 1970, the
number of seconds that have passed since the first moment of 1970. This may be inconvenient in
some cases. If so, then the miniDOT Concatenate program not only concatenates all the
measurement files, but also adds more readable statements of the time stamp.
Please refer to Chapter 2 for instructions on operating the miniDOT Concatenate program.
The miniDOT Clear Logger requires time and battery energy to work through the file directory on the
SD card to allocate new file space. A few hundred files on the SD card is not a problem, but as the
number of files grows large into the thousands then the miniDOT Clear Logger may suffer decreased
battery life or other performance problems. Please, at the earliest convenient time, copy the
recorded files to a HOST computer and delete them from miniDOT Clear Logger’s SD card. Also, do
not use miniDOT Clear Logger to store files unrelated to the miniDOT Clear Logger’s operation.
1.3 Overview & General Maintenance
C L E A N I N G T H E S E N S I N G F O I L
The sensing foil can be cleaned at regular intervals depending on the fouling condition at the site.
The cleaning procedure of the sensing foil should be done with caution so that the protective coating
is not removed. If the fouling is calcareous it can normally be dissolved with household vinegar.
If the marine growth remains, then use Q-tips to gently wipe the sensing foil after it has been
softened by soaking in vinegar or perhaps diluted HCl. After cleaning the sensing foil, then it should
be rinsed well in clean tap water before storing or reuse. Do not use other organic solvents such as
acetone, chloroform, and toluene since these and others will damage the sensing foil.
Never peel away untreated organisms from the oxygen sensing foil. Doing so will likely damage it.
The sensing foil can also be cleaned using a 3% H2O2 solution or rinsing it with ethanol.
The clear pressure housing and black end cap can be gently scrubbed however the clear pressure
housing can easily scratch if an abrasive material is used.
housing.
