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Technical background
The philosophy behind NeuLog's plug and play
technology is based on each sensor's ability to store its
own data due to an internal flash memory chip and
micro-controller in each plastic NeuLog body. This
technology allows the sensor to collect and then store
the digital data in the correct scientific units (for
o
o
example:
C,
F, Lux, %, ppm).
The sensor is pre-calibrated at the factory. The built-in
software in the logger can be upgraded for free at any
time using the provided firmware update. In spite of that,
the probe needs to be offset prior to initial use. Please
review the "Sensor offset" guide at the beginning of this
document for detailed instructions.
The sensor is based on a Clark type probe that includes
a platinum electrode and an AgCl electrode placed in a
KCl electrolyte; all is covered by a Teflon membrane.
Oxygen molecules diffuse through the membrane
oxidizing the AgCl electrode; this accepts positive
potential while the electrolyte accepts negative potential
according to the following equations:
2AgCl → 2AgCl
+
-
+ 2e
→ 2OH
-
-
O + H
O + 2e
2
The potential difference of the electrodes is converted
into an oxygen measurement by the sensor's controller
using the temperature compensation calculation.
The sensor offset process also depends on the internal
temperature readings.
V2018.01
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