VEGA VEGASEL 643 - Manual (Page 3)

VEGASEL 643 3
Product description
1 Product description
1.1 Function and configuration
VEGASEL 643 auxiliary level switch is a build-in instru-
ment with terminal socket, suitable for carrier rail
mounting (DIN 46 277). Together with a sensor or a
VEGAMET… signal conditioning instrument it is used
for level detection.
Typical applications are two-point controls, e.g. pump
controls (ON/OFF) and monitoring functions such as
overfill protection and protection against dry running of
pumps.
The auxiliary level switch is provided with two passive
inputs, a current and a voltage input as well as addi-
tionally with an active current input. Hence VEGASEL
643 can be connected for control either with a
VEGAMET… or a sensor (4 … 20 mA).
Function
VEGASEL 643, controlled by a VEGAMET…
- The continuous current or voltage course of the
VEGAMET… signal processing instrument is
processed into a switching command.
Fig. 1.2 VEGASEL 643 with sensor
p p
Fig. 1.1 VEGASEL 643 on a VEGAMET
1 2 4 3
5 6 7 8
9 10 11 12 13 14
on
VEGAMET 602EX
%
50
0
100
!
1 2 4 3
5 6 7 8
9 10 11 12 13 14
on
max.
min.
VEGASEL 643
– –
+ +
6 5
– –
+ +
3 5
0/4 … 20 mA
or
0 … 10 V
1 2 4 3
5 6 7 8
9 10 11 12 13 14
on
max.
min.
VEGASEL 643
– –
+ +
6 5
– –
+ +
3 5
Sensor
(4 … 20 mA)
VEGASEL 643 with a 4 … 20 mA sensor
- VEGASEL 643 auxiliary level switch powers via the
active current input the sensors and processes its
continuous 4 … 20 mA current signal into a switch-
ing command.
In both cases a relay output is available for process-
ing.
Configuration
With a VEGASEL 643 an available measuring system,
consisting of sensor and VEGAMET signal condition-
ing instrument can be extended by a level detection.
Or an own measuring system can be created with a
4 … 20 mA sensor.
1.2 Approvals
If measuring systems are created according to the
following approvals, the respective legal documents
and their regulations have to be observed. These
documents are supplied with the respective measur-
ing system.
WHG-approval, VbF-approval
VEGASEL 643 auxiliary level switch together with a
measuring system (sensor and VEGAMET) as part of
an overfill protection acc. to WHG (test certificate
applied) or acc. to the regulations for combustible
liquids (test certificate applied).
CE-conformity
see „1.4 Technical data“.