IFM efector 160 LR3000 - Unit Functionality Overview; Measuring Principle and Key Features

8
Function5
Measuring principle5.1
The unit operates to the principle of
guided wave radar� It measures the
level using electromagnetic pulses in
the nanosecond range�
The pulses are transmitted by the sen-
sor head and guided along the rod (fig�
1)� When they hit the medium to be
detected they are reflected and guided
back to the sensor (fig� 2)� The time
between transmitting and receiving the
pulse directly relates to the travelled
distance (D) and the current level�
The reference for distance measure-
ment is the lower edge of the process
connection�
D
21
The figure shows operation with single
probe�
In case of operation with a coaxial probe,
the guided wave runs along the inside of
the coaxial pipe�
Features of the unit5.2
Easy set-up
When the unit is supplied with operating voltage for the first time, the probe •
length, the medium to be detected and the type of probe used must be entered�
Afterthis,theunitisoperational.(→10.2).
If necessary, parameters for the output signals and optimisation of the monitor-•
ingfunctionscanbeset(→10.3to10.5).
All settings can also be carried out before installation of the unit� •
Reset to the factory settings is possible�•
Electronic lock can be set to prevent unintentional operations�•
Display functions
The unit displays the current level, either in cm, inch or in percent of the final •
value of the measuring range� Factory setting: cm� The display unit is defined
byprogramming(→10.3).IntheRunmode,itcanbetemporarilyswitched
between length indication (cm / inch) and percentage:
Press [Set] briefly� ►
The selected unit is displayed for 15 s, the corresponding LED is lit� >
With each push of the button the display type is changed�