Jeulin 453 076 Mode D'emploi page 19

Data logging
CO probe
2
Ref :
453 076
ENGLISH
U = -233 mV
1
U = -133 mV
M
log p = log (0.03) - (( -233 - (-133))/59.5 = 0.16
M
6 Malfunctions
If you obtain an unstable reading, make sure there are no air bubbles in the
glass electrode. If there are bubbles in the electrode, remove them by
shaking the electrode the same way you would a medical thermometer. If the
problem persists, change the electrolyte and if necessary the probe head.
If you cannot calibrate the probe (it will not rise to 5.82%, blockage at 10%,
etc.), gently clean the tip of the electrode with an absorbant tissue soaked in
alcohol, change the electrolyte, and if necessary the probe head.
Note:
The calibration described above is a precise calibration. For qualitative work
(variations in CO levels during photosynthesis or respiration), it is not
2
necessary to perform such a precise calibration.
Attention: The electrode must be polarized (see Ch III).
In the event of a persistent blockage of the probe at 10%, remove the probe
head and rinse the electrode copiously with distilled water until a response is
obtained.
7 Testing the probe
You can test the polarization of the probe by connecting it to a pH meter that
reads in mV. The value obtained should be between -180 and - 240 mV with
the probe in the air.
8 Storage and care
The probe is stored in open air, with the probe head either without a stopper
or a with a non-hermetic stopper to avoid excessive pressure (if you want to
use the rubber stopper provided with the probe, make a hole in the end of it).
Place the probe with the head facing downwards and protect it from being
jarred.
19
therefore, the gas contains 10
Bubbles to be removed
Electrode
Probe body
0.16
% or 1.44 % CO .
2