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®
- Series VMZ
Construction and function
Technical changes reserved
- 7 -
3
Construction and function
Components:
Housing:
The Housing consists of plastic and has the
IP65 degree of protection.
Electrical connection:
The electrical connection is made via 4
-pin
plug M12x1.
Operation / flow indicator LED.
Type plate with flow direction (marking)
Process connection:
The process connections are available in dif-
ferent sizes.
Construction:
The measuring tube with its earthing sleeves and electrodes passes
through the housing and forms the external process connection of the
VMZ.
A magnetic field for the measurement process is generated inside the
housing, which also contains the sensor and signal conditioning cir-
cuitry.
The two stainless steel electrodes are located in the middle of the
measuring tube between the earthing sleeves.
The VMZ does not need any moving parts to make measurements. The inside of the measur-
ing tube is completely open, allowing the fluid to flow unhindered through the measuring
tube.
Function:
The magnetic inductive flow sensor functions according to the induction principle. A DC volt-
age is generated by the movement of a conductor in a magnetic field:
The measuring tube of the VMZ is located in a magnet-
ic field (B).
An electrically conductive medium (V) flows through
the measuring tube. The positive and negative charge
carriers are oppositely deflected.
A voltage (U) is generated at right angles to the mag-
netic field, which is picked up by the two electrodes.
Thereby, the induced voltage is proportional to the av-
erage flow velocity of the liquid.
The electronics of the VMZ converts the induced voltage into a flow-proportional frequency
signal.
