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If you would like to do spot measurements, where the sensor is out of the water most of the time, we recommend you to keep the sensor in a wet
environment (such as a plastic bag with water) in-between measurements.
Please be aware of that the wetting effect is foil chemistry dependent. There are sensors from other manufacturers which can have wetting effects of up to
15 %.
Measurement Related
MR 1
Q: Can I measure oxygen in air with the sensor?
A: Yes, but in dry air you should expect slightly higher readings since there is no water vapour present.
The space normally taken by vapour in humid air is here replaced by more air and consequently the sensor should give slightly higher readings.
Please be aware that there is a high risk of having a different temperature at the foil compared to the temperature of the incorporated temperature sensor in
air.
This might lead to errors in the temperature compensation and to readings that are not correct.
MR 2
Q: What is the reason that several sensors plunged into the same water do not give exactly the same values?
A: Depending on the given accuracy of the sensor which is mainly dependent on if it was two or multipoint point calibrated (see above) differences (within
specifications) between sensors should be expected. There have also been cases when the user had not mixed the water well and consequently the oxygen
concentrations were different at different locations in the water bath.
MR 3
Q: What physical factors will affect the sensor?
A: Temperature (which is already internally compensated), salinity (see below or Operating Manual) and pressure (see below or Operating Manual).
page 70 of 93
TD 269 OPERATING MANUAL
OXYGEN OPTODE 4330, 4831, 4835
June 2017
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