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PG. 26
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E A S Y M E T H O D
miniDOT Clear has a broad flange at one end. The easy way to mount miniDOT Clear is by
shackling this mounting flange to a bight tied into a rope. Several miniDOT Clear may be mounted
on the rope in this way. This is the easy way, but subject to the considerations below.
A B R A S I O N
miniDOT Clear's oxygen sensing foil is constructed of silicone rubber and other materials. This
material can be worn away with resulting loss of calibration. If miniDOT Clear is to be used in moving
water transporting sand or other debris some protective housing must be constructed. The goal is to
reduce water velocity near miniDOT Clear's sensing foil but at the same time allow water access,
without accumulation of debris.
B U B B L E S
In some cases bubbles from sediment decomposition can rise through the water column. If these
become trapped against miniDOT Clear's sensing foil, they will bias the miniDOT Clear's
measurement. miniDOT Clear's sensing end is heavy compared to the rest of the instrument.
miniDOT Clear will therefore tend to hang with the sensing end downwards and may trap bubbles. If
bubbles are anticipated the mounting should arrange to position miniDOT Clear horizontally or with
the sensing end upwards.
F O U L I N G
miniDOT Clear senses the oxygen concentration within its sensing foil. Software within miniDOT
Clear uses this value to calculate the amount of oxygen that must have been present in the fresh
water adjacent to the foil. The assumption that fresh water is in contact with the foil is implicit in this
calculation. Fouling organisms that colonize the foil surface can interrupt the water-foil connection. In
this case the oxygen concentration in the foil represents whatever oxygen is within the organisms.
Living things use or generate oxygen and so their presence will bias miniDOT Clear's
measurements. If fouling organisms are present the mounting should be designed to limit their
presence or at least be designed so that the miniDOT Clear can be cleaned from time to time.
Enjoy your new miniDOT Clear Logger!
