Vega Capacitive electrodes EK … with signal conditionin Bedienungsanleitung PDF herunterladen (Seite 18)

18 Capacitive electrodes EK with signal conditioning instrument

Mounting

Fig. 2.1 Lateral load

2 Mounting

2.1 Mounting instructions

General

Different mediums and requirements to the

measurement require various installations.

Hence the following instructions should be

noted.

Length of the level electrode

Note when ordering the electrode, that the

electrode must be sufficiently covered ac-

cording to the electrical features of the me-

dium (DK-value).

E.g. an electrode for level detection in oil

~ 2) requires a considerably higher cover-

ing than in water (e

~ 81).

Lateral load

Note that the electrode is not subjected to

strong lateral forces. Mount the electrode in a

position in the vessel where no interfering

influences such as e.g. stirrers, filling open-

ing etc. occur. This is mainly valid for very

long rod and cable electrodes.

Extraction forces

In case of strong extraction forces e.g. dur-

ing filling or settling of solids, high tensile

loads can be caused.

In these cases use for short measuring dis-

tances a rod electrode, as a rod is generally

more stable. If due to the length or the mount-

ing position a cable electrode should be

necessary, the electrode should not be

strained, but only equipped with a gravity

weight as then the cable can more easily

follow the product movements. Note that the

electrode cable does not touch the vessel

wall.

Pressure

In case of gauge or low pressure in the ves-

sel, the mounting boss must be sealed at the

thread. Use the attached seal ring. Check if

the seal ring is resistant against the medium.

Isolating measures such as e.g. the covering

of the thread with Teflon tape can interrupt the

electrical connection in case of metal vessels.

Hence earth the electrode on the vessel.

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