19 Thermal energy rate measurement
FLUXUS F502TE 19.4 Steam in inlet
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UMFLUXUS_F502TEV1-5EN, 2020-05-29
19.4.2 Display of the state of aggregation
During the thermal energy rate measurement, the state of aggregation of the fluid can be displayed in the upper line by
pressing .
display explanation
S state of aggregation in the supply line
R state of aggregation in the return line
GAS The fluid is completely gaseous.
LIQU The fluid is completely liquid.
BOIL The fluid is in phase transition.
In this case, an exact measurement of the thermal energy rate is not possible, because the proportion of the
fluid in liquid phase has to be known in order to calculate the enthalpy in the supply line.
The critical range of water is defined as ±3 °C around the boiling temperature. In the critical range, the steam
saturation enthalpy is used to calculate the thermal energy rate.
Example
S= GAS R= LIQU
The fluid in the supply line is completely gaseous. The fluid in the return line is completely liquid. A thermal energy rate
measurement is possible.
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