Temperature sensor downstream of the SCR catalytic converter, component description

W14.40-1207-06

Location

6 Muffler with reduction catalytic converter

B116 Temperature sensor downstream of SCR catalytic converter

The temperature sensor downstream of the SCR catalytic converter (B116) is installed into the outlet chamber of the muffler with reduction catalytic converter (6).

Task

The temperature sensor downstream of the SCR catalytic converter (B116) detects the temperature of the exhaust flow in the outlet chamber of the muffler with reduction catalytic converter (6) and passes this information on as an electrical voltage signal to the SCR frame module control unit.

Design

The temperature sensor downstream of the SCR catalytic converter (B116) consists of a stainless steel threaded housing and an electrical connector..

The sensor contains a measuring element - a PTC resistor. PTC stands for "Positive Temperature Coefficient" and means that the electrical resistance increases as the temperature increases.

The temperature sensor downstream of the SCR catalytic converter (B116) is a passive sensor (i.e., it is not supplied with voltage).

Function

The exhaust gas flowing past the temperature sensor downstream of the SCR catalytic converter (B116) influences the inside of the measuring element inside the sensor and thus the size of the electrical resistance. The values of the changing electrical resistance are transmitted in defined intervals as an analog signal to the SCR frame module control unit, are digitized there and then forwarded to the engine control (MR) control unit.

Using this resistance value, the MR control unit calculates the associated temperature.