Engine | 900.91/92 in model 000.001 |
with BlueTec | |
Engine | 902.91/93 in model 000.001 |
with BlueTec | |
Engine | 904.94/95/96/97 in model 000.001 |
with BlueTec | |
Engine | 906.93/94/95/96/98/99 in model 000.001 |
with BlueTec | |
Engine | 924.91/93/94 in model 000.001 |
with BlueTec | |
Engine | 925.9 in model 000.001 |
with BlueTec | |
Engine | 926.91/92/93/95/97/98 in model 000.001 |
with BlueTec |
W14.40-1250-08
8 | AdBlue® metering device | B128 | SCR compressed-air pressure sensor |
Location
The SCR compressed-air pressure sensor is screwed into the AdBlue® metering device (8) from the outside. The AdBlue® metering device (8) is located at the rear right of the cylinder head.
Task
The SCR compressed-air pressure sensor records the current compressed air pressure in the AdBlue® metering device (8).
Structure
The SCR compressed-air pressure sensor consists of a stainless steel housing with a thread and an electrical connector. The inside of the SCR AdBlue® pressure sensor contains a measuring element, consisting of a silicon membrane, equipped with measuring strips. These measuring strips are electrical resistors, which change their resistance on expansion (piezoresistive principle).
Function
The compressed air pressure in the AdBlue® metering device (8) affects the SCR compressed-air pressure sensor. The signals of the SCR compressed-air pressure sensor are read in by the engine management (MR) control unit (A6).