Probe Measurements

  Sensor probe WSA Device in order to position the sensor in the flame.

At the combustion laboratories of the chair of Heat and Mass transfer (WSA) different probe measurement techniques are applied. These invasive measurement techniques are mainly used to determine the temperature and the composition of the combustion gas within a flame. But also other measurement equipment such as cameras and spectrometer can be applied. The probes are water- or oil- cooled to discharge the heat from the flame. The probe is inserted into the combustion chamber to record a radial profile of the measured parameter.

The tip of the suction pyrometer probe is a ceramic shield with a coaxial fixed thermocouple for high temperatures. The flue gas is sucked through the uncooled ceramic tip with velocities above 150 m/s. Because of the shielding of the radiation and the high extraction velocities, the temperature of the thermocouple can be assumed to be equal to the actual gas temperature at the specific position of the ceramic tip.

For flue gas composition measurements, an oil-cooled probe is used to extract a flue gas sample to the measuring cabinet. The probe and the pipe to channel the flue gas sample to the analyzer are tempered to prevent condensation of water. The flue gas components are determined using non dispersive UV- and IR-spectroscopy; measured components are for example CO2, CO, NO, NO2, O2 und SO2.

Measurement techniques

  • Suction pyrometer
  • Gascomposition probe

Measured Variable

  • Temperature
  • Concentrations of components in flue gas (CO2, CO, NO, NO2, O2, SO2)