Endress+Hauser Liquicap M FMI51 HART - Technical Data; Probe Specifications

Technical data Liquicap M FMI51 HART
84 Endress+Hauser
12 Technical data
12.1 Probe
12.1.1 Capacitance values of the probe
The basic capacitance of the probe is approximately 18 pF.
12.1.2 Additional capacitance
Mount the probe at a minimum distance of 50 mm (1.97 in) from a conductive container
wall:
approximately 1.3 pF/100 mm (3.94 in) in the air for a rod probe
Fully insulated probe rod in water:
• approximately 38 pF/100 mm (3.94 in) for 16 mm (0.63 in) rod
• approximately 45 pF/100 mm (3.94 in) for 10 mm (0.39 in) rod
• approximately 50 pF/100 mm (3.94 in) for 22 mm (0.87 in) rod
Rod probe with the ground tube:
• approximately 6.4 pF/100 mm (3.94 in) in air
• approximately 38 pF/100 mm (3.94 in) in water for 16 mm (0.63 in) probe rod
• approximately 45 pF/100 mm (3.94 in) in water for 10 mm (0.39 in) probe rod
12.1.3 Probe lengths for continuous measurement in conductive
liquids
The maximum length of the rod probe ≤ 4 m (13 ft) for capacitive range 0 to 2 000 pF.