TDK has unveiled an NTC sensor element designed for measuring temperatures up to 650°C, which can be used in exhaust gas recirculation systems.
It is based on a high-temperature ceramic sensor element which is connected to a metallised aluminium oxide rod and then encapsulated in glass.
The sensor element offers high-precision measurement with a temperature tolerance of about ±1 K at 200°C.
The new sensor is available optionally with wires welded to the aluminium-oxide rod. The component is 16mm long and the glass encapsulation has a diameter of 2mm.
The high-temperature sensor is qualified to AEC-Q200 and designed for use in especially demanding automotive electronics applications, for example, in exhaust gas recirculation systems.
These are used mainly on diesel engines to reduce excess oxygen in the combustion gas and thereby minimise the formation of nitrogen oxides at high combustion temperatures.
In the recirculation systems the NTC sensors measure the temperature of the exhaust gas and thus help to protect the engine against overheating – in particular, the cylinder head and valve seats.