Support With Marine Approval (Gl); Measuring Condition - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Mounting
12
4.1.2

Support with marine approval (GL)

Conductive or non-conductive support can be provided for fully insulated rod probes.
Partially insulated rod probes may only be supported with insulation at the uninsulated
end of the probe.
Rod probes with a diameter of 10 mm (0.39 in) and 16 mm (0.63 in), and a length
≥ 1 m (3.3 ft) must be supported, see →  3,  12
 3 Rod support overview. Unit of measurement mm (in)
L/4 ¼ probe length
L/2 ½ probe length
L Active probe length
Example of calculating distances
• probe length L = 2 m (6.6 ft)
• L/4 = 500 mm (19.7 in)
• L/2 = 1 m (3.3 ft)
Measured from the end of the probe rod = 300 mm (11.8 in).
4.2

Measuring condition

• When installing in a nozzle, use inactive length L3.
• Probes with active buildup compensation must be used for high-viscosity liquids
that tend to form buildup.
• Fully insulated rod probes must be used for pump control (ΔS operation).
The switch-on and switch-off points are determined by the empty and full
calibration.
The maximum length depends on the probe used. A ⌀16 mm (0.63 in) rod
generates a capacitance of 380 pF/m (114 pF/ft) in a conductive liquid.
With a maximum span of 1 600 pF, this gives 1 600 pF/380 pF per meter =
4 m (13 ft) of total length.
• Use a ground tube for non-conductive media.
Liquicap M FTI51
A0040416
Endress+Hauser