2 mounting instructions – VEGA VEGACAL 65 Profibus PA User Manual

Page 13

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4 Mounting

VEGACAL 65 • Profibus PA

30034-EN-130917

The max. permissible pressure is specified in chapter "Technical

data" or on the type label of the sensor.
Insulating measures, such as e.g. covering the thread with teflon tape,

can interrupt the necessary electrical connection with metal vessels.

For this reason, ground the probe on the vessel or use a conductive

seal material.

Metal vessel
Make sure that the mechanical connection of the probe to the vessel

is electrically conductive to ensure sufficient grounding.
Use conductive seals, such as those made of copper or lead, etc.

Insulating measures, such as covering the thread with Teflon tape,

can interrupt the necessary electrical connection with metal vessels.

For this reason, ground the probe on the vessel or use a conductive

seal material.
Non-conductive vessels
In non-conductive vessels, e.g. plastic tanks, the second pole of the

capacitor must be provided separately.

If possible, the capacitive probe should be mounted vertically or par-

allel to the counter electrode. This applies particularly to applications

in non-conductive products.
In cylindrical tanks, spherical tanks or other asymmetrical tank forms,

nonlinear level values are generated due to the varying distance to

the vessel wall.
Use a concentric tube in non-conductive products or linearize the

meas. signal.

If condensate forms on the vessel top, the run-off liquid can cause

bridging and hence measurement errors.
For this reason, use a screening tube or a longer insulation. The

length depends on the amount of condensate and the drain-off be-

haviour of the product.

4.2 Mounting instructions

During operation, the probe must not touch any installations or the

vessel wall. The measured value can also change if the distance to

the vessel wall changes considerably. If necessary, secure the end of

the probe (insulated).
In the gravity weight there is a thread (M12), e.g. for a ring bolt (article

no. 2.27424). The thread is already insulated in the gravity weight with

an adapter.
Make sure that the probe cable is not completely taut. Avoid tensile

loads on the cable.

Vessel material

Vessel forms

Condensation

Installation position

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