Vega Capacitive electrodes EL Profibus PA Bedienungsanleitung PDF herunterladen (Seite 18)

18 Capacitive electrodes EL - Profibus PA

Cable electrode in solids

Mounting

Fixing

weight

Continuous electrodes

Non-conductive vessels

In non-conductive vessels, e.g. plastic tanks,

the second pole of the capacitor must be

provided separately, e.g. in the form of a

concentric tube.

When using a standard instrument, a suitable

grounding surface is necessary. Provide

therefore the largest possible grounding

surface, e.g. wire braiding laminated into the

vessel wall or metal foil glued to the vessel.

Connect the grounding surface to the ground

terminal on the housing.

Rod electrode

Mount the rod electrode such that the elec-

trode protrudes into the vessel. When mount-

ing in a tube or a socket, material buildup that

deters the measurement can form. This is

particularly the case with viscous or adhesive

mediums.

Cable electrode in solids

Depending on the type of solid, the filling

method and its location, the cable electrode

may "float" inspite of the gravity weight. The

electrode (cable) is pushed by the solid

against the vessel wall or to the surface, thus

causing incorrect measured values. This

should be avoided during continuous meas-

urement.

If this happens, use a fixing weight or insula-

tor to secure the cable electrode.

When securing the cable electrode, avoid

high tensile forces. An appropriate fixing

spring which prevents cable overload can be

found in our price list.

Lateral mounting

With measuring probes that deliver continu-

ous measured values, the electrode must be

installed vertically. If installation from the top

is not possible, the electrodes can also be

mounted laterally.

Under accessories in our price list, you can

find a screening tube and a closing cone or

an angled rod electrode with which the instru-

ment can also be laterally mounted. Deter-

mine a screening tube length (L) that will not

allow product bridges to form between cable

and vessel wall, and that will not allow the

electrode cable to touch the vessel wall

through movements. Use a fixing weight or

fixing insulator.

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