How It Works - Jeulin Ex.A.O. 453 076 Mode D'emploi

Data logging
Erreur ! Source du renvoi introuvable.
Ref : 453 076

2. How it works

2.1
2.2
The following reaction takes place in the electrolyte of the CO
The following is the dissociation constant for the reaction:
Because the HCO
obtains [H
CO
The CO
would therefore be necessary, in theory, to calibrate the probe for each temperature
change. In practice, however, using the CO
temperature is sufficient.
The CO
Consequently, when you remove the probe from the calibration solution after having
adjusted the "slope," it is necessary to wait ca. 5 to 10 minutes for it to display a level
lower than 0.2%.
If the probe must be readjusted to zero, wait 15 min. before doing so.
ENGLISH
Description
Probe body
Electro-chemical principle of the functioning
mechanism
CO
-
concentration is high in the electrolyte, it varies little, and one thus
3
+
] = K' [CO ] = K'' pCO
2
). The CO concentration is thus measured by measuring the pH of the electrolyte.
2 2
probe is not compensated for temperature (in contrast to the oxygen probe). It
2
probe has a response time of ca. 2 min. (10 sec. for the O
2
+
+ H O H +HCO
2 2
+
[H ] [HCO
=
K
[CO ]
2
(wherein pCO corresponds to the partial pressure of
2 2
probe at a nearly constant ambient
2
11
Glass electrode
Probe head
Membrane
probe:
2
3-
-
]
3
probe).
2