1.1
General description of zirconia oxygen analyzer
This zirconia oxygen analyzer makes use of the oxygen ion conductivity of solid electrolytes composed
PDLQO\RI]LUFRQLD=U2
) at high temperatures.
If electrodes of platinum or the like are attached to both faces of a solid electrolyte and the faces are on the
FRQGLWLRQVRIGLIIHUHQWR[\JHQSDUWLDOSUHVVXUHVDQHOHFWURFKHPLFDOUHDFWLRQFDXVHVDQHOHFWURPRWLYHIRUFH
EHWZHHQERWKWKHHOHFWURGHV7KLVSKHQRPHQRQLVFDOOHGFRQFHQWUDWLRQFHOODFWLRQ
0LFURVFRSLFDOO\ LW LV DVVXPHG WKDW HOHFWURFKHPLFDO UHDFWLRQV RFFXU DW WKH LQWHUIDFH WKUHHSKDVH LQWHUIDFH
DPRQJDVROLGHOHFWURO\WHHOHFWURGHDQGR[\JHQ
+LJKR[\JHQSDUWLDOSUHVVXUHVLGH2
H
–
ĺ2
±
(ionization)
/RZR[\JHQSDUWLDOSUHVVXUHVLGH2
±
ĺ2
H
–
(molecularization)
$QHOHFWURPRWLYHIRUFH(JHQHUDWHGLVH[SUHVVHGDVIROORZVZLWK1HUQVW¶VHTXDWLRQ
'HYLFHFRQ¿JXUDWLRQRIGLUHFWLQVHUWLRQW\SHR[\JHQDQDO\]HU
7KHGLUHFWLQVHUWLRQW\SH]LUFRQLDR[\JHQDQDO\]HUFRQVLVWVRIWKHGHWHFWRUZLWKDVHQVRUXQLWWKHÀRZJXLGH
WXEHWKDWLVGLUHFWO\LQVHUWHGWRWKHVWDFNRUWKHOLNHLQRUGHUWRVXSSO\DJDVWRWKHGHWHFWRUDQGWKHFRQYHUWHU
WKDWSHUIRUPVVHQVRUFRQWUROVLJQDOSURFHVVLQJRXWSXWGLVSOD\DQGH[WHUQDOWUDQVPLVVLRQ7KHGHWHFWRUDQG
FRQYHUWHUDUHFRQQHFWHGZLWKDFDEOH
1. INTRODUCTION
High-oxygen partial
pressure side P
H
Low-oxygen partial
pressure side P
L
Solid electrolyte
O
2
O
2
Electrode
O2-
Ionization
Molecularization Electromotive
force
Nernst’s equation
RT
P
H
(O
2
)
P
L
(O
2
)
E =
1n
4F
E
: Electromotive force
P
H
(O
2
)
: Oxygen partial pressure of a
reference gas (atmosphere)
P
L
(O
2
)
: Oxygen partial pressure of a
measured
gas
R
: Gas constant 8.3144[J
･
m ol
-1
･
K
-1
]
T
:
Absolute
temperature[K]
F
: Faraday constant 9.649×10
4
[c
･
mol
-1
]
Oxygen molecule
Zirconia
Platinum
Tree-phase interface:
a part where electrochemical
reactions occur.
O
2-
Converter
Detector
Flow guide tube
Flow of gas
Stack
Cable
(sensor output line, thermocouple output line,
heater power wire)
,QSULQFLSOHWKHGHWHFWRU=).LVFRPSDWLEOHZLWKWKHH[LVWLQJGHWHFWRUV=).DQG=).VWUXFWXUDOO\DQG
electrically.
+RZHYHUWKH0VFUHZVIRUWKHWHUPLQDOEORFNRIWKHGHWHFWRUZHUHFKDQJHGWRWKH0VFUHZV,IXVLQJ
WKHH[LVWLQJFDEOHFKDQJHWKH0WHUPLQDOIRUFDEOHHQGWUHDWPHQWRQWKHGHWHFWRUVLGHWRWKH0WHUPLQDO
7KHGHWHFWRUV=).=).DQG=).FDQEHFRQQHFWHGWRWKHFRQYHUWHUV=5<=50RU=.0
7KHÀRZJXLGHWXEHFDQEHFRQQHFWHGWRWKHH[LVWLQJSURGXFWV
5HSODFHPHQWRIWKHH[LVWLQJGHWHFWRU=).ZLWKWKHGHWHFWRU=).
All manuals and user guides at all-guides.com
all-guides.com
