Shortening Of The Electrode; Filling Opening; Humidity From Outside - Vega EL 11 Operating Instructions Manual

Shortening of the electrode

The dimensions of fully insulated electrodes are
fixed and must hence not be modified. Each
modification will destroy the instrument.
Partly insulated cable or rod electrodes can be
shortened afterwards.
The electrode basic capacitance is automa-
tically compensated during adjustment. It is
hence possible to shorten the electrodes
individually.
Cable electrode EL 31 can also be shortened
afterwards (see fig. 2.2). Loosen the two pins
on the gravity weight (hexagon) and remove the
two pins. Pull the cable out of the gravity
weight.
To avoid splicing of the steel cable (EL 31)
during cutting, you have to tin the cable around
the cutting position with a copper bit or strongly
tighten the cable with a wire. Shorten the
electrode cable with a metal cutting saw or a
cutting-off wheel by the the requested length.
Carry out the adjustment. The instruction is
under "4.1 Adjustment".
Fig. 2.2 Shortening of the electrode
18

Filling opening

Install the electrode such that it does not
protrude directly into a strong filling stream.
Should such an installation place be necessary,
mount a suitable sheet above or in front of the
electrode e.g. L 80 x 8 DIN 1028, etc.

Humidity from outside

To avoid humidity ingress, loop the connection
line to the electrode housing on vertically
installed electrodes directly behind the cable
entry to the bottom so that rain and
condensation water can drain off.
This is mainly valid for mounting outside, in
areas where humidity must be expected (e.g.
by cleaning processes) or on cooled or heated
vessels (see fig. 2.3).
Cable entries
Fig. 2.3 Humidity
When mounting outside, on cooled vessels or in
humid areas where cleaning is made e.g. with
steam or high pressure, the seal of the cable
entry is very important.
Use cable with a round cross-section area of
conductor and tighten the cable entry. The
cable entry is suitable for cable diameters of
5 mm to 9 mm.
Metal vessels
Capacitive electrodes EL 4 ... 20 mA - compact
Mounting