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®
- Series VMM
Construction and function
Technical changes reserved
- 9 -
Special safety instructions:
Danger! Electric current!
Particular care must be taken if the front window of the housing becomes fogged over or
discolored because moisture, water or product might seep through the wire sheath into
the terminal compartment in the housing!
Ingress protection IP67 is only achieved if suitable and tightly screwed down cable glands
or conduits are used. If the cable glands are only tightened manually water may leak into
the terminal compartment in the housing.
Electromagnetic compatibility is only achieved if the electronics housing is closed. Leav-
ing the enclosure open can lead to electromagnetic disturbances.
Further warnings that are specifically relevant to individual operating procedures or activities
can be found at the beginning of the relevant sections of this operating manual.
3
Construction and function
3.1
Construction
The VMM comprises a sensor and the display electronics. The sensor is used to measure flu-
id media. The display electrodes generate the coil current required for the magnetic field and
prepares the induced voltage applied to the electrodes.
The VMM does not need any moving parts to make measurements. The inside
of the measuring tube is completely open, allowing the fluid to flow unhin-
dered through the measuring tube.
Display electronics:
The display electronics has a backlit LCD.
6 buttons are used for operation. That facilitates easy
configuration of the display electronics.
Furthermore the display electronics has an analog
0/4 … 20 mA current output, a pulse or frequency out-
put and a status output.
