Eatu Input Nox Sensor, Component Description - Mercedes-Benz OM 471 Introduction Into Service Manual

GF49.20>W>3008HA
ENGINES 471.9 in MODEL 963, 964 with CODE (M5Y) Engine version Euro V
ENGINES 471.9 in MODEL 963, 964 with CODE (M5R) Engine version EEV
Location
1 Exhaust aftertreatment unit
A70 EATU input NOx sensor control unit
A70 b1 EATU input NOx sensor
The EATU input NOx sensor (A70 b1) is
screwed into the chamber downstream of
the SCR catalytic converter and ammonia
slip catalytic converter from the outside and
forms one unit together with the EATU
input NOx sensor control unit (A70).
Task
The EATU input NOx sensor (A70 b1) represents the actual
measurement sensor, whereas the EATU input NOx sensor
electronic control unit (A70) is used to compute the NOx
concentration in the exhaust after exhaust aftertreatment by the
SCR catalytic converter and ammonia slip catalytic converter.
Design
2 Electrical connection
A70 EATU input NOx sensor control unit
A70 b1 EATU input NOx sensor
The EATU input NOx sensor control unit (A70) and the EATU input
NOx sensor (A70 b1) are connected to each other via a non>
separable electrical line and form one unit.
The EATU input NOx sensor (A70 b1) is similar in design to a wide>
band oxygen sensor. It is fitted with its basic elements such as the
so>called Nernst cell and the oxygen pump cell.
Its front part in the measuring probe which projects out into the
exhaust consists of a metal housing with openings and a gas>
permeable ceramic body inside made out of zirconium dioxide.
i Introduction of engine OM 471 and exhaust aftertreatment > 09/2011 >

EATU input NOx sensor, component description

– This printout will not be recorded by the update service. Status: 09 / 2011 –
System components
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