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2
DEVICE DESCRIPTION
18
SITRANS FX330
www.siemens.com/flow
05/2016 - A5E36751269-AA
2.2.8 Gross heat quantity calculation (optional)
This feature enables the calculation of the heat flow volume in systems where hot water,
saturated or superheated steam is used for heating.
The determination of gross heat is based on the relation between the temperature-dependent
enthalpy of steam and mass flow. The enthalpy tables are permanently programmed in the
device memory.
The calculated density-compensated mass flow is multiplied by the correct enthalpy in order to
obtain gross heat flow.
Gross power [Q
H
] = mass flow [Q
m
] x enthalpy [H]
The absolute hot water and steam consumption, as well as the energy, can be monitored
internally via a totalizer, which enables an integration of the measured heat flow over time.
INFORMATION!
Gross heat quantity calculation is an optional feature, which can be unlocked in menu "C6.3
Extras". Please contact the manufacturer to obtain the four digit code required to enable this
feature.
For programming example refer to Gross heat measurement on page 84.