Technical Data; Capacitance Values Of Probe; Additional Capacitance; Input - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Liquicap M FTI51, FTI52
Endress+Hauser
10

Technical data

10.1

Capacitance values of probe

• Basic capacitance: approx. 18 pF
10.2

Additional capacitance

• Mount the probe with a minimum distance of 50 mm from a conductive container wall:
Probe rod: approx. 1.3 pF/100 mm in air
Probe rope: approx. 1.0 pF/100 mm in air
• Fully insulated probe rod in water:
Approx. 38 pF/100 mm (16 mm rod)
Approx. 74 pF/100 mm (14 mm rod)
Approx. 45 pF/100 mm (10 mm rod)
Approx. 50 pF/100 mm (22 mm rod)
• Insulated probe rope in water: approx. 19 pF/100 mm
• Rod probe with ground tube:
Insulated probe rod: in air approx. 6.4 pF/100 mm
Insulated probe rod: in water approx. 38 pF/100 mm (16 mm rod)
Insulated probe rod: in water approx. 45 pF/100 mm (10 mm rod)
10.3

Input

10.3.1 Measured variable
Level limit detection of change in capacitance between probe rod and container wall or ground tube,
depending on the level of a liquid.
10.3.2 Measuring range (valid for all FEI5x)
• Measuring frequency:
500 kHz
• Span:
ΔC = 0 to 1600 pF
• Final capacitance:
C = max. 1600 pF
E
• Adjustable initial capacitance:
C = 0 to 500 pF (range 1 = factory setting)
A
C = 0 to 1600 pF (range 2)
A
10.3.3 Input signal
Probe covered => high capacitance
Probe not covered => low capacitance
Technical data
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