Heinrichs Messtechnik GmbH
OPERATING MANUAL TMU / UMC3
Page 101 of 122
7.2.12.4
Monitoring of sensor amplitude and excitation current
The first line of this window contains the amplitudes of the sensor signals S1 and S2 in 10 µV. Both values
should be close to each other or identical (ideal case). The second line shows the excitation current in 10 µA
units.
S1 7749 S2 7812
E 1280
Example: The sensors have amplitudes of 77.49 mV and 78.12 mV. The excitation current is 12.8 mA. These
values are used as reference values for the self-test function. They are measured by using the function
7.2.12.3, “Self-test calibration” on page 100. Afterwards they can be displayed or edited by this function.
7.2.12.5
Display of sensor amplitudes
The first line of this window contains the actual measured amplitudes of the sensor signals S1 and S2. Both
values should be close to each other or identical (ideal case). The second line shows the excitation frequency
and current.
S1 090 S2 089 mV
112.8 Hz 12.8 mA
Example: The sensors have amplitudes of 90 mV and 89 mV. The excitation current is 12.8 mA and the actual
resonance frequency is 112.8 Hz.
The combination with the raw value display (see chapter 7.2.1.15, “Raw values” on page 60) supports the
analysis of all electrical signals between mass flow sensor and transmitter.
