2
）
Working Principle
The sensing head of oxygen sensor is a kind of earthenware conduit with hole, outside conduit surrounded by
emission air, inside circulate atmosphere . the wall of earthenware conduit is zirconium dioxide, electrical heating
pipe inside.
The work of oxygen sensor is to transfer the difference of oxygen ion concentration between inside and
outside of earthenware. When the temperature of earthenware conduit reach 350
O
C, it will the characteristic of
solid state electrolyte, let the oxygen ion concentration get through earthenware freely. Using this characteristic,
transfer concentration difference into electric potential difference, get the electrical signal output. If the mix air
concentration is high, then the between inside and outside of earthenware conduit, oxygen ion concentration
difference is high, electric potential difference is high, quantity oxygen ion concentration move out from inside,
output voltage is high( close to 800mV-1000mV);,if the mixed air concentration is low, just little oxygen ion
concentration move out, output voltage is low (close to 100mV). Signal voltage occur mutation at the theory
air/fuel ration(
λ
=1)
3)Technical Specification
Scope Value
Unit
Room Temperature
，
≥
30 M
Ω
Exhaust Temperature
≥
10 M
Ω
The insulation resistance
between the heating
component of new oxygen
sensor and sensor tie-in
850
℃
Exhaust Temperature
≥
100 k
Ω
Rating Voltage
12
V
Continuous Working Voltage
12-14
V
Maintain 1% of total life working voltage
most(emission temperature
≤
850 )
℃
15 V
Maintain working voltage for 75 seconds
most(emission temperature
≤
350 )
℃
24 V
Electric source &Voltage
on plug
Test voltage
13
V
13V,reach heat power of heat balance
(emission temperature 350 , emission flue speed 0.7m/s)
℃
12 W
working voltage 13V,reach heat power of heat balance
(emission temperature 350 .emission fule speed 0.7m/s)
℃
5 A
blown fuse of heating circuit
8
A
