Exhaust gas temperature gauge

EGT ( exhaust gas temperature of, dtsch exhaust gas temperature ) is the measured temperature of the exhaust of a piston engine or a gas turbine.

Display

The display device ( engl. exhaust gas temperature indicator, short EGT called ) this can be found in the cockpit of many aircraft because of piston engines, the altitude change leads to an accumulation or leaning of the fuel -air mixture, and in jet engines EGT for the life of the blades of the turbine shall prevail.

Measurement

The sensor is usually a thermocouple type K consisting of a transition between a nickel -chromium alloy and nickel. Semiconductor sensors or PT100 resistance thermometers are not suitable for the high temperatures involved, or not suitable to provide the required long operation times of several thousand hours. The thermocouple is connected to appropriate special cable, so that the measured voltage is not distorted by other transitions in compounds of various metals.

Engine control

In a piston engine is super-cooling or overheating tendencies because of the enrichment or leaning of the fuel-air mixture through the measurement and display of the exhaust gas temperature can be recognized early. Using the EGT of the engine can be leaned as far as that engine damage does not occur, and at the same time, fuel consumption is reduced. A detailed description of the process can be found at Leanen.

In jet engines temperatures are measured at several points, and on the one hand brought to the display, but on the other hand also be used to control the engine. The difference between exhaust gas temperature and the outside temperature is determined substantially the efficiency of the engine. The maximum exhaust gas temperature is determined by the heat resistance of the materials of the first turbine stage. Therefore, high-quality ceramic materials and nickel alloys are used for cooled turbine blades this stage. The exhaust gas temperature measured downstream of the turbine most in turboprop engines can be found, however, an indication of the turbine inlet temperature ( TIT ), or an indication of the temperature within the turbine (ITT).