← Back Jenbacher 550404 Thermocouple Jenbacher 550404 original

The code 550404 identifies a thermocouple, which is a high-precision industrial temperature sensor.

In massive gas engines like Jenbachers, monitoring temperatures is absolutely vital to prevent catastrophic failures. These thermocouples are typically installed along the exhaust manifold (one for each cylinder) or near the turbochargers to measure the temperature of the exiting exhaust gases.

The data collected by this sensor is sent in real-time to the engine's control module (Jenbacher's DIA.NE system). If the thermocouple detects that a specific cylinder is running too hot, the engine's computer immediately knows there is a problem (such as an incorrect air/gas mixture, a misfiring spark plug, or a leaking valve) and can adjust parameters or shut the engine down before pistons or valves melt. Due to the extreme temperatures and vibrations it endures, it is a consumable electronic component that requires periodic replacement.