Endress+Hauser Liquicap M FMI51 HART - Input Specifications; Output Specifications

Liquicap M FMI51 HART Technical data
Endress+Hauser 85
12.2 Input
12.2.1 Measured variable
Continuous measurement of change in capacitance between the probe rod and container
wall or ground tube, depending on the level of a liquid.
The probe covered -> high capacitance.
The probe not covered -> low capacitance.
12.2.2 Measuring range
• measuring frequency:
500 kHz
• span ΔC
• recommended: 25 to 4 000 pF
• possible: 2 to 4 000 pF
• final capacitance C
E
:
max. 4 000 pF
• adjustable initial capacitance C
A
:
• < 6 m (20 ft) 0 to 2 000 pF
• > 6 m (20 ft) 0 to 4 000 pF
12.3 Output
12.3.1 Output signal
FEI50H (4 to 20 mA / HART version 5)
3.8 to 20.5 mA with HART protocol
12.3.2 Signal on alarm
FEI50H (4 to 20 mA / HART version 5)
Fault diagnosis can be called up via:
• red LED on the local display
• error symbol on the local display
• plain text on the display
• current output 22 mA
• digital interface: HART status error message
12.3.3 Linearization
FEI50H (4 to 20 mA / HART version 5)
The Liquicap M linearization function enables conversion of the measured value into any
desired length or volume units. Linearization tables for volume calculation of horizontal
cylindrical tanks and spherical tanks are pre-programmed. Any other tables with up to 32
value pairs can be input manually or semi-automatically.