Autosen AF001 Notice D'utilisation page 15

3 Functions and features
The unit monitors the level of liquids in tanks�
3.1 Application area
• Water, hydrous media, oils, coolant emulsions�
3.2 Restriction of the application area
• The unit is not suitable for acids, alkalis, granulates, bulk materials�
• It is not suitable for hygienic areas�
• Highly conductive foam can trigger a switching operation� Check the conse-
quences by performing a test in your application!
• For water and hydrous media with temperatures > 35° C install the unit in a
climatic tube�
• Maximum tank pressure: ±0�5 bar (when mounted using the appropriate moun-
ting accessories; →chapter 5.2 Installation procedure).
4 Function
4.1 Measuring principle
The unit operates to the capacitive measuring principle� By direct contact with the
medium the unit detects whether the requested level (limit level) is reached and
indicates this by a switched signal�
The dielectric constant of a medium is important for its detection� Media with a
dielectric constant > 1�8 are safely detected�
Dielectric constants of common liquids
mineral oil
coolant emulsion
glycol
water
water, demineralised
Electrically conductive and non conductive media are detected�
UK
≈ 2
≈ 25...75
≈ 37
≈ 80
≈ 30
15