SK-8402
取扱説明書（英文）
_P15
15
Zirconia O2 Sensor
This instrument cannot display the deterioration
level of A/F (air-fuel ratio) sensor on bar graph.
Zirconia O2 Sensor was launched to clean the exhaust gas of the
car, efficiency was improved year by year, and it is the most
typical sensor type now. Zirconia O2 Sensor generates electricity
by itself and provides an output voltage corresponding to a
quantity of residual oxygen in exhaust gas.
Titania O2 Sensor
Titania O2 sensor has two types: titania 1V O2 sensor and
titania 5V O2 sensor. In the past, there was the car model that
was equipped titania O2 sensor instead of zirconia O2 sensor,
but it is not popular now. The resistance value of titania O2
sensor is changed corresponding to a quantity of residual
oxygen in exhaust gas, therefore supplying external power
supply voltage is necessary for titania sensor to obtain the
output signal.
Correct knowledge about the O2 sensor types are necessary to use this instrument properly.
This instrument is suitable for deterioration check for zirconia O2 sensor and titania 1V/5V O2 sensors.
Confirm the type of the target O2 sensor with your own vehicle maintenance manual.
BEFORE USE
Zirconia O2 sensor
Catalyst
●
A/F (air-fuel ratio) sensor :
A/F sensor tends to be equipped to fuel-efficient car or
low exhaust car recently. O2 sensor can recognize only a
change of signal between "rich mixture" (low in remaining
oxygen) and "lean mixture" (high in remaining oxygen),
but A/F sensor can output the fluctuating signal of A/F
linearly every moment.
The number of wiring for the dual cell type A/F sensor is
five or more.
This instrument cannot display the deterioration
level of Rear O2 Sensor on bar graph.
●
Rear O2 Sensor :
Rear O2 Sensor is equipped behind the catalyst to check
the condition of 3-way catalyst. Sensor in itself is the same
as O2 sensor equipped in manifold side, but the waveform
of output signal is different. If the measurement result of
rear O2 sensor and manifold side O2 sensor are almost the
same, the exhaust gas would not be purified by 3-way
catalyst and there would be some problems in the exhaust
system.
1. Types of O2 Sensors
