Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU / UMC3
Page 79 of 122
7.2.6.15
Density calibration hot medium
A single point density calibration can be made with a suitable mass flow sensor by the operator. The procedure
is described in detail in chapter 7.3, “Density calibration” at page 110.
With this function the necessary measurement of the resonant frequency and the medium temperature is
made. The sensor must be filled with a liquid medium. At a temperature of e.g. 60 °C hot water can be used as
harmless medium or for optimal results the process medium under normal operating conditions.
Frequency/temp.
measure? [no]
After selecting [yes] with the arrow keys, press “
” to execute the measurement.
7.2.6.16
Measured values hot medium
The values of the function “Density calibration hot medium” above are displayed in the upper line. Pressing 2
times the green “
” confirms them without any change. Afterwards the density of the measured medium has
to be entered as reference in the lower line.
60.50°C 166.409 Hz
Rho = 0994,1 g/l
The density is always entered in the unit g/l (equivalently too kg/m³) and if required can be amended by toggling
the arrow keys.
Pressing the “
” key confirms the entry.
7.2.6.17
Finish density calibration
In order to finalise and store the density calibration by both preceding functions it is necessary to complete
some internal calculations.
Calculate?
[no]
by toggling the arrow keys switch the displayed option to “yes” and press “
”.
The reference values for the density measurement are then calculated and saved. Furthermore, to activate
density measurement the density measurement must be activated as described in section 7.2.6.1, “Density
measurement on/off” on page 74.
