Tecfluid LD61N - Manual (Page 2)

2
1. WORKING PRINCIPLE
The LD61N level switch is based on the variation of the natural resonant frequency of a
vibrating fork, when it comes into contact with a liquid.
This variation is detected by the internal electronics and is used to determine the state of
the output .
2. RECEPTION
The LD61N level detectors are supplied ready for installation and operation.
They are supplied packed for their protection during storage and haulage.
To handle the detectors, they should always be held by the head, never by the vibrating
fork.
The vibrating fork should not be modified or bent, as this can damage the detector beyond
repair.
3. INSTALLATION
The LD61N level switch can be
mounted in any position. The more
usual insertion points are shown in the
figure 1.
In positions 1 the LD61N acts as a
maximum level detector. In positions 2
the LD61N acts as a minimum level
detector and in position 3 it acts as an
empty pipe detector (for example, to
protect a pump).
If the LD61N is installed in a horizontal
position it is recommended to install it
with the tines vertical to avoid
accumulation of substances, especially
in the case of high viscosity liquids.
To indicate the position of the tines the
LD61N has a round mark on two of the
flats of the nut. These marks should be
in a vertical position when the detector
is installed in a horizontal position.
Punto de
posicionamiento
Positioning mark
Figure 1