MIVI Technical Manual
REF: 379/4 5
1. General presentation
1.1 Principle
The measuring chain is composed of two inseparable elements: the sensor and the electronics
device that controls it (also called transducer). The sensor cannot be used with another elec-
tronic device because they are matched together as one vibrating system, and vice versa.
The provided viscosity information is relative. In the same fluid and under the same environmental
conditions, the information is the same. For two fluids with a different rheological behaviour,
the response can be different. Since it is perfectly repeatable, it just needs a different corre-
lation.
The active part of the sensor is composed of a vibrating rod held in oscillation at resonance fre-
quency (also called tuning-type) by driving magnets. When the rod is immersed into a vis-
cous material, the amplitude of the vibration is dampened. The vibration amplitude and its
frequency vary according to the viscosity and the density of the product where the rod is
immersed. The sensor receiving coil detects the response and the signal is converted to a
viscosity value through the electronics device. The factory calibration is performed with cer-
tified viscosity standards.
The transducer acquires the coils’ voltages and generates various signals. These signals represent
the properties being measured. It is also in charge of powering the whole system.
A choice of electronic from simple transducer to touchscreen PLC/HMI provides process infor-
mation (viscosity, density or temperature) through different kinds of output.
1.2 Various models
The MIVI sensor can be assembled in many different ways to match with the process needed pa-
rameters. Here are the main designs:
general standard sensor;
sanitary sensor;
Ex-proof sensors (ATEX, FM, JIS, KOSHA);
high pressure sensors (up to 1 000 bar);
special models, according to the requirements (material and design);
when required, a temperature probe can be incorporated in the MIVI sensor. Standard
temperature probe is a Pt100 class B.
Overview of the product range is available in document ref. 280 (see APPENDIX D).
Special sensors can be manufactured on demand. Contact the local distributor.
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