FLUXUS F70x 16 Heat Flow Measurement
142 UMFLUXUS_F7V4-6-2EN, 2017-10-01
16.2.3 Input of a Constant Temperature
If the supply or return temperature is known and constant during the whole measurement, this temperature can be entered
in the transmitter.
The temperature inputs are configured as follows:
The constant value of the temperature is entered before the start of the measurement in the program branch Measuring
(see section 16.4).
16.2.4 Defining the Physical Quantity and of the Unit of Measurement
• Select the program branch Output Options.
• If the heat quantity is also to be measured, select Special Funct.\SYSTEM settings\Measuring. Press ENTER
until the list item Heat Quantity is displayed.
16.3 BTU Mode
The BTU mode is a measuring mode that is designed specifically for the heat flow measurement. In the BTU mode, the
position of the transducers and the application can be assigned to avoid receiving the opposite sign of the measured val-
ues.
16.3.1 Activation/Deactivation of the BTU Mode
Press key C. Enter HotCode 007025 .
Note! A constant temperature should be entered if, e.g., the supply temperature can only be measured with
difficulty but is known and constant.
Select Special Funct.\SYSTEM settings\Proc. inputs\Link temperature.
Press ENTER.
Select the list item Fixed input val. if the supply temperature is known and constant.
Press ENTER.
Select the list item Fixed input val. if the return temperature is known and constant.
Press ENTER.
Repeat the steps for all measuring channels on which a measurement is being conducted.
Select the measuring channel on which the heat flow is to be measured (the channel to
which the temperature inputs have been assigned). Press ENTER.
This display will not be indicated if the transmitter has only one measuring channel.
Select Heatflow as the physical quantity. Press ENTER.
Select the unit of measurement to be used for the heat flow.
Note! The physical quantity Heatflow will only be displayed in the program branch Output Options of
a measuring channel if the supply and return temperature have been assigned to this channel.
Select the unit of measurement (J or Wh). Press
Select on to activate the BTU mode, off to deactivate it. Press ENTER.
Note! The BTU mode remains active after a restart of the transmitter.
Proc. inputs ↕
Link temperature
A:T-Inlet ↕
Fixed input val.
A:T-Fluid/Outle↕
Fixed input val.
Output Options ↕
for Channel A:
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