Adblue“ Fill Level Sensor/Temperature Sensor, Component Description - Mercedes-Benz OM 471 Introduction Into Service Manual

System components
GF14.40>W>3026H
ENGINE 471.9 in MODEL 963, 964
Location
Shown on model 963 with code (M5Z)
Engine version Euro VI
1 AdBlue" tank
B74 AdBlue" fill level
sensor/temperature sensor
The AdBlue" fill level sensor/temperature
sensor (B74 ) is screwed in from the outside
into the AdBlue" container (1). This is
generally located on the left longitudinal
frame member.
Task
The AdBlue" fill level sensor/temperature sensor (B74 ) records
the fluid level and the temperature of the AdBlue" supply in the
AdBlue" container (1).
Design
2 AdBlue" inlet (return from AdBlue" metering device)
3 AdBlue" outlet (feed line to pump module)
4 Coolant outlet (to pump module)
5 Coolant inlet (from engine)
6 Electrical connection
7 Float
8 Bayonet ring
9 Immersion tube
10 AdBlue" filter
11 Coolant duct
B74 AdBlue" fill level sensor/temperature sensor
The AdBlue" fill level sensor/temperature sensor (B74) contains
separate components for determining the fill level and the
temperature.
Fill level sensor
The fill level is determined with the aid of the immersion tube (9)
with integrated resistance measuring chain made of so>called
reed contacts and a float (7), which contains permanent magnets.
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AdBlue" fill level sensor/temperature sensor, component description
– This printout will not be recorded by the update service. Status: 09 / 2011 –
Temperature sensor
For the temperature measurement a measuring element based on
the NTC resistance (Negative Temperature Coefficient) is located
at the lower end of the immersion tube (9).
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20.7.11
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