SCR AdBlue temperature sensor, component description

B14.40-0024-08

1 Metering unit

Arrangement

The AdBlue temperature sensor (4) is fastened to the outside of the metering unit (1). The metering unit (1) is located close to the last cylinder head cylinder.

4 AdBlue SCR (17B07) temperature sensor

Task

The AdBlue (4) pressure sensor captures the AdBlue pressure at a measuring point inside the metering unit (1) and transmits the information to the engine control module (MR), as an electrical tension signal.

B14.40-0025-11

Composition

The AdBlue (4) pressure sensor consists of a threaded stainless steel housing and an electrical connector.

The inside of the AdBlue temperature sensor (4) contains an NTC resistor as a measuring element. The acronym NTC means "Negative Temperature Coefficient" and says that the electrical resistance diminishes with he raise of temperature. The AdBlue (4) temperature sensor is a passive sensor. i.e., it is not supplied with tension.

Function

The AdBlue actuating on the temperature sensor (4) influences, depending on the temperature, the measuring element inside the sensor and, therefore, in the amount of electric resistance. The variations of electrical resistance are transmitted in defined intervals as analog signals to the control module (MR).

The control module (MR) calculates the corresponding temperature, starting from the resistance values.