Endress+Hauser nivocompact FTC 731 Installation And Operating Manual page 23

Calibration
Material characteristics (bulk solid)
Very low dielectric constant
ε
approx. 1.6...2.0
r
Low dielectric constant
ε
approx. 2.0...2.5
r
Average dielectric constant
ε
approx. 2.5...4.0
r
High dielectric constant
or conducting bulk solid
When the probe is covered with non-conductive bulk solid having a low
dielectric constant, then the Nivocompact only switches when the rod probe
is completely covered with the material.
The degree of covering depends on the calibration.
Turning the fine calibrating element clockwise causes the Nivocompact to
become less sensitive.
• Set the switching delay (refer to Page 18)
• Select the safety switching (refer to Page 19)
No build-up approx. 90° (2 divisions)
With low build-up approx. 135° (3 divisions)
No build-up approx. 180° (4 divisions)
With low build-up approx. 270° (6 divisions)
No build-up approx. 270° (6 divisions)
With low build-up approx. 1 complete turn
No build-up approx. 1 complete turn
With low build-up approx. 2 complete turns
Determining the Switching Point
Fig. 20
Capacitance calibration must be carried out
both slowly and carefully.
Adjusting for Material
Characteristics
Fig. 21
Accurate adjustment ensures high switching
reliability.
Remember!
21