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The two latter parameters are easily compensated for by simple formulas which are common for all sensors.
MR 4
Q: What chemical factors/elements will affect the sensor?
A: There exists no cross sensitivity for carbon dioxide (CO
2-
-
(SO
) or chloride (Cl
).
4
The sensors can also be used in methanol- and ethanol -water mixtures as well as in pure methanol and ethanol.
It should not be used in other organic solvents, such as acetone, chloroform or methylene chloride, which may swell the foil matrix and destroy it.
Interferences (cross-sensitivity) are found for gaseous sulphur dioxide (SO
MR 5
Q: Is the sensor sensitive to H
S?
2
A: No, it is not. It will not be damaged by H
If H
S is present the oxygen concentration should be zero or very close to zero since O
2
are examples in which AADI optodes have been deployed for almost 2 years in H
MR 6
Q: What is the pressure behaviour of the sensor?
A: The pressure effect is that the sensor reads 3.2% lower readings/1000 meters of water depth which means that at 1000 meters you will have to multiply
your readings with 1.032 to get the correct absolute values and at 2000 meters with 1.064 etc.
This effect is the same for every sensor, it is linear and fully instantaneously reversible, when the pressure is released. The pressure effects were
investigated in detail by Uchida et al. (2008). Please note that the pressure effect is foil dependent. Optodes from some other manufacturers will most likely
not have the same behaviour.
MR 7
Q: What about hysteresis?
A: As opposed to electrochemical sensors and optodes from some other manufacturers the AADI optodes does not suffer from hysteresis (irreversible
pressure effects).
The pressure effect on the sensor described above immediately disappears when the pressure is released.
MR 8
Q: Can I log data of oxygen concentration, oxygen saturation and temperature simultaneously on the old AADI SR10 output (e.g. on a RCM9/RCM11/Buoy
with 3660 data logger etc.).
A: No, the Optode only has one SR-10 output channel.
You can either select to log oxygen concentration or oxygen saturation on your instrument.
To see how this set-up is done see the Operating Manual for 3830 and 3835 optodes or the OxyView software.
), hydrogen sulphide (H
2
) and gaseous chlorine (Cl
2
S and it is not cross-sensitive to it.
2
page 71 of 93
S), ammonia (NH
), pH, any ionic species like sulphide (S
2
3
).
2
and H
S rarely coexists, especially over longer time periods. There
2
2
S rich environments without any detectable damage or drift.
2
TD 269 OPERATING MANUAL
OXYGEN OPTODE 4330, 4831, 4835
June 2017
-
), sulphate
2
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