4 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 FMG90.
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 FMG90 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) which is proportional to the mean flow velocity will be induced in the medium and subsequently picked up by the two electrodes.
5 Installation
Before installing, check that
the wetted materials of the device are suitable for the media being used (see Materials Table "10.1").
the equipment is switched off and is in a safe and
the equipment is depressurised and has cooled down.
SUITABLE TOOLS:
Use only suitable tools of the correct size.