Technical Manual 9200
REF: 380/5 5
1. Transmitter principle
The measuring chain is composed of three inseparable elements: the sensor, its cable and the 9200
transducer that controls it. The sensor cannot be used with another transducer or another
cable type or length because they are all a part of the resonant loop so they are matched
together as one vibrating system.
The active part of the sensor is composed of a vibrating rod held in oscillation at resonance frequency
by driving magnets. When the rod is immersed into a viscous material, the amplitude of the
vibration is dampened. The vibration amplitude varies according to the product viscosity
where the rod is immersed.
The sensor receiving coil detects the response and the signal is converted to a viscosity value
through the electronic device. The factory calibration is performed with standard oils.
The transducer acquires the coils’ amplitudes and frequency and generates various signals. These
signals represent the properties being measured. It is also in charge of powering the whole
system. It gives viscosity and temperature information through the serial communication and
displays it. The transmitter also allows simple settings as the very important “zero in the air”
procedure.
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