Operating Principle; Mechanical Connection; Area Of Application - Kobold MM Series Operating Instructions Manual

6 Operating Principle

The Kobold-liquid Level Transducers consist of a tube on which a float travels with
inserted magnet, similar to the Kobold level float switch, in models without float on
the tube, the float is placed in and adjacent bypass tube to actuate the reed chain
contacts, however, in the MM, the magnet remotely actuates the reed contacts
inside the tube.
However, the well-known principle of the level float switch has been changed, in
such a way that the tube of the level transducer contains an electric resistance
chain and a reed contact chain.
The float remotely actuates the contacts through the tube wall and a voltage
proportional to the liquid level can be taken from the chain. This voltage sensing
corresponds to the function of the slide of a resistance potentiometer.

7 Mechanical Connection

The reed chain tube should not be bent or exposed to hard impacts, since
otherwise the reed contacts inside the tube can be damaged.
Ensure the correct use of cable gland and gasket on float switches with plug to
prevent the penetration of humidity.
While installation is carried out, please ensure that the float can move freely (due
allowance should be given to distances from side-walls!).
Mounting position of the slide-tube may not deviate more than ±30° from vertical
position.
If the float has to be removed, pay attention to correct orientation when replacing
the float.

8 Area of application

Magnetic level sensor MM series are used exclusively for level control and
monitoring of liquid media.
The liquids should not contain suspended solids or tendency to crystallize.
Ensure that the construction materials of the float switch have chemical resistance
sufficient to prevent mechanical deformations that may affect it.
page 5
MM series
DT0593