Temperature sensor downstream of the SCR catalytic converter, component description

B14.40-0002-06

Arrangement

1 SCR catalytic converter

5 Temperature sensorafter the SCR catalytic converter (17B03)

The temperature sensorafter the SCR catalytic converter (5) is fastened to the outside of the outlet chamber of the SCR catalytic converter (1)

Task

The temperature sensorafter the catalytic converter (5) records the exhaust gas stream temperature in the outlet chamber of the SCR catalytic converter (1) and transmits this information as an electric tension signal, to the SCR chassis control module.

Composition

The temperature sensorafter the catalytic converter (5) consists of a threaded stainless steel housing with an electric connector.

The inside of the temperature sensorafter the SCR catalytic converter (5) contains a PTC resistance. PTC stands for "Positive Temperature Coefficient" and means that the electric resistance increases as the temperature increases.

The temperature sensorafter the catalytic converter (5) is a passive sensor. i.e., it is not supplied with tension.

Function

The exhaust gas temperature flowing by the temperature sensorafter the catalytic converter (5) influences the measuring element inside the sensor and, therefore, the amount of electric resistance. The values of the electric resistance are transmitted, in predefined intervals, as an analog signal to the SCR chassis control module, where they are digitalized and sent to the engine control module (MR). The engine control module (MR) calculates the correspondent temperature, utilizing the electric resistance value as a base.