Liquicap T FMI21
Endress+Hauser 3
Function and system design
Measuring principle The probe, medium and ground rod (counter electrode) form an electric capacitor.
If the probe is in the air ➀, a certain low initial capacitance is measured.
When the tank is filled, the capacitance of the capacitor increases the more the probe is covered ➁ ➂.
As of a conductivity of 30 µs/cm, the measurement does not depend on the dc-value of the liquid.
The electronic insert of the probe converts the capacitance measured to a current, in proportion to the level,
in the range of 4...20 mA, thus making it possible to interpret the level.
All input and output channels are safely galvanically isolated from one another.
L00-FMI21xxx-15-05-xx-xx-001
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: Initial capacitance (probe exposed)
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: Final capacitance (probe covered)
Measuring system Probe with integrated electronic insert
The measuring system consists of:
• The components of a capacitive probe Liquicap T FMI21:
➀ Housing with two probe rods
(one probe rod fully insulated and the second uninsulated (ground potential))
➁ Electronic insert FEI20
➂ Display (optional)
➃ Housing cover (optional: cover with sight glass in conjunction with display)
• A transmitter power supply unit
L00-FMI21xxx-14-05-xx-en-000
mn o
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