Connecting To Power Supply; Preparing The Connection; Connection Steps - Instrument Housing - Vega VEGASON S 62 Operating Instructions Manual

4 Connecting to power supply

Vessel installations such as e. g. ladders, level
switches, heating spirals, struts etc. can cause
faulse echoes which can superimpose the
useful echo.
In case of existing vessel installations, a false
signal suppression should be carried out during
setup.
If vessel installations such as struts or supports
cause false echoes, these can be attenuated
through supplementary measures. Small,
inclined sheet metal or plastic baffles above the
installations scatter the ultrasonic signals and
avoid direct false echoes.
α
α
Abb. 22: Cover flat, large-area profiles with deflectors
Agitators
If there are agitators in the vessel, a false signal
storage should be carried out with the agita-
tors in motion. This ensures that the interfering
reflections from the agitators are saved with the
blades in different positions.
Inflowing medium
Do not mount the instruments in or above the
filling stream. Make sure that you detect the
medium surface, not the inflowing product.
Abb. 23: Inflowing liquid
Foam
Through the action of filling, stirring and other
processes in the vessel, dense foams which
considerably damp the emitted signals may
form on the medium surface.
If foams are causing measurement errors, the
24
α α
α α
sensor should be used in a standpipe or, alter-
natively, the more suitable guided radar sensors
(TDR) should be used.
Guided wave radar is unaffected by foam
generation and is particularly suitable for such
applications.
Air turbulences
If there are strong air currents in the vessel, e.g.
due to strong winds in outdoor installations or
air turbulence, e.g. by cyclone extraction you
should mount VEGASON S 62 in a standpipe or
use a different measuring principle, e.g. radar or
guided radar (TDR).
4 Connecting to power
supply
4.1

Preparing the connection

Note safety instructions
Always keep in mind the following safety
instructions:
•
Connect only in the complete absence of
line voltage
Select voltage supply
The supply voltage and the current signal are
carried on the same two-wire connection cable.
The data for power supply are specified in chap-
ter "Technical data" in "Supplement".
Select connection cable
Connection is made with standard two-wire
cable without screen. An outer cable diameter
of 5 ... 9 mm ensures the seal effect of the
cable entry.
4.2 Connection steps - Instru-
ment housing
Proceed as follows:
1. Unscrew the housing lid
2. If a display and adjustment module is ins-
talled, remove it by turning it slightly to the
left
3. Loosen compression nut of the cable entry
gland
4. Remove approx. 10 cm of the cable mantle,
strip approx. 1 cm insulation from the indivi-
dual wires
VEGASON S 62 •