25.2.2 2. Round Surface (Tube)
▪ Setup
During the HeatRun, the Radiator top and bottom (outlet and inlet) temperatures must be
measured. Usually there are tubes, which are not very easy to measure. To check the
performance of different types of surface temperature measurement probes for round surfaces,
the setup depicted in figure 2 was constructed.
Figure 2: Round surface test setup
The steel tube to be measured has a diameter of 50mm and a thickness of 5mm. The tube was
heated using 3 power resistors circularly arranged inside the tube . For reference temperature
measurement 2 Thermocouples Type J were used. Each of them were sticked in a hole (d =
1.5mm, h = 2mm) filled with thermal compound for optimal thermal conduction. The
thermocouples are the two black cables in figure 2. The probes under test were located near to
the thermocouple probes.
The thermal contact is not very good for the OF/E-14 and even worse for the Tettex probe.
▪ Probes under Test
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