Dwyer MFS2 - Manual (Page 7)

Series MFS2 Construction and function
Technical changes reserved - 7 -
3 Construction and function
Construction:
The measuring tube with its earthing sleeves and electrodes
passes through the sensor housing and forms the external
process connection of the MFS2.
A magnetic field for the measurement process is generated
inside the sensor housing, which also contains the sensor and
signal conditioning circuitry.
The two stainless steel electrodes are located in the middle of the
measuring tube between the earthing sleeves. The MFS2 does
not need any moving parts to make measurements. The inside of
the measuring 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:
The measuring tube is located in a magnetic field (B).
If an electrically conductive medium (V) flows through
the measuring tube and, therefore, at right angles to
the magnetic field, a voltage (U) that is proportional to
the mean flow velocity, will be induced in the medium
and subsequently picked up by the two electrodes.
4 Installation of MFS2
Before installing, check that

the wetted materials of the device are suitable for the media being used ( § 9.2
"Materials table").
 the equipment is switched off and is in a safe and de-energized state.
 the equipment is depressurized and has cooled down.
SUITABLE TOOLS:
Use only suitable tools of the correct size.