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ManualsBrandsGeneral Technologies ManualsPower ToolsST05 Oxygen Sensor Tester and Simulator
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
The oxygen sensor is one of the most critical parts of the emission control system and fuel
economy performance. This sensor measures the oxygen content in the exhaust gases,


of pollutants and reduces fuel consumption.


which causes higher combustion temperatures responsible for producing pollutants like




   

4.1 

This is the most commonly used type of sensor, and it is based on the properties of Zir-
conium Dioxide (ZrO
2

ions through it, creating an electrical charge on a platinum plate. These electrical charges
generate the signal output for the sensor.
The most important characteristics of this type of sensor are:
1- Zirconia sensors do not require any external power or signals, they generate their


         
              

-

back was used to let air into one side of the sensing element. The most modern ones
use the sensor wires as air conduits for the same purpose.

on the high side (rich mixture) and to 0.2 V or below on the low side (lean mixture).



6- Response time: is the time it takes the sensor to change its output from below 0.175

to rich. The response time should be less than 100 ms, a longer transition time or not


This type of sensors uses the properties of Titanium Dioxide (TiO
2
), which changes its
electrical resistance in relation to the oxygen content of the exhaust gases. Titanium sen-

factors, like air pollution, or contamination like water.
The most important characteristics of this type of sensor are:
1- Titanium sensors require external power, which is either 1 Volt or 5 Volt depending on

2- These sensors are all of the heated type.
3- In order to work properly, the temperature of the sensor must be between 800 and


Volt systems, the signal should switch from close to 0 Volts for Lean to near 1 Volt for



6- Response time: It is the time it takes the sensor to change its output from below 0.2

to rich. The response time (as in the Zirconia sensors) should be less than 100 ms, and




the fuel mixture.


but the heater wires must remain connected. Once the signal wires are disconnected,


oxygen sensors”).
