High temperature. The thermocouple on the engine has failed. Kongsberg Troubleshooting

The No. 1 auxiliary engine has activated a high exhaust temperature alarm. In this article we will analyze the actions of electrical engineer to find and fix these problems.

In the exhaust system on the engine there are two thermocouples that measure the temperature at two points (A and B), these points correspond to their group of cylinders. The values at both points should be approximately equal (at 500°C), but the thermocouple at point B showed a temperature of 620°C and it continued to rise on the AMS monitor.

What are thermocouple meters?

Thermocouple meters convert applied current (a-c or d-c) by thermoelectric effects into deflection currents which register on a PM moving-coil couple actuated by heat generated at the junction formed by two strips of dissimilar metal. One strip carries the heat-generating input currents, the other carries heat-produced currents to the meter movement.

Thermocouple meters are used to measure a wide range of either a-c or d-c currents and give an accurate picture of the effective, or heats producting, value of a current no matter what its nature. The meters are relatively expensive and the thermal delay in converting input electricity to heat makes them sluggish.