Cable Electrodes In Solids; Non-Conductive Vessels; Lateral Installation; Rod Electrode - Vega EL 11 Operating Instructions Manual

Mounting
Note that the mechanical connection of the
electrode is electrically conductive connected
with the vessel to ensure sufficient earth.
Use conductive seals such as e.g. copper, lead
etc. Isolating measures such as covering the
thread with Teflon tape can interrupt the
necessary electrical connection. In this case
use the earth terminal on the housing to
connect the electrode to the vessel wall.

Non-conductive vessels

In non-conductive vessels, e.g. plastic tanks,
the second pole of the capacitor must be
provided separately, e.g. by a concentric tube
or the use of a double rod electrode.
When using a standard electrode, a suitable
earth plate is necessary. Hence provide a
possibly large earth plate, e.g. wire braiding
laminated into the vessel wall or metal foil which
is glued to the vessel. Connect the earth plate
with the earth terminal on the housing.

Rod electrode

Mount the rod electrode such that the electrode
protrudes into the vessel. When mounting in a
tube or a socket, build-up can be caused which
can influence the measurement. This is par-
ticularly the case with viscous or adhesive
products.
Capacitive electrodes EL 4 ... 20 mA - compact

Cable electrodes in solids

Dependent on the kind of solid and position or
kind of filling, the cable electrode can "float"
despite of the gravity weight. The electrode
(cable) is pushed by the solid to the vessel wall
or to the top and wrong measured values are
caused. This should be avoided with
continuous level measurement.
In this case use a fixing weight or a fixing
insulator to fasten the electrode (fig. 2.4).
When fastening the cable electrode avoid high
tensile strenghts. An appropriate fixing spring
avoiding overloading of the cable is listed in our
pricelist as accessory.

Lateral installation

Fig. 2.4 Cable electrode in solids
19