Vega VEGATOR 631 Ex Operating Instructions Manual page 24

6 Set up
Level detection for min.
signal
Two-point control (min./
max.), mode A (overfill
protection)
Two-point control (min./
max.), mode B (dry run
protection)
24
The max. electrode is now adapted to the conductivity of the medium i.
e. the relay deenergises at max. level and the transistor blocks.
Set the mode selection switch to mode B
l
Connect the signal conditioning instrument to power supply
l
Turn the potentiometer to position 10
l
Empty the vessel until the min. electrode is covered approx. 1 cm
l
by the product
Turn the potentiometer slowly anticlockwise until the yellow signal
l
lamp extinguishes
The min. electrode is now adapted to the conductivity of the medium, i.
e. the relay deenergises at min. level and the transistor blocks.
At first, connect only ground and max. electrode to the signal
l
conditioning instrument (terminals 1 and 3)
Set the mode selection switch to mode A
l
Connect the signal conditioning instrument to power supply
l
Turn the potentiometer to position 0
l
Fill the vessel until the max. electrode is covered approx. 1 cm by
l
the product
Turn the potentiometer slowly clockwise until the yellow signal
l
lamp extinguishes
Connect the min. electrode to terminal 2 of the signal conditioning
l
instrument
The two-point control is now adapted to the conductivity of the
medium, i.e. the relay deenergises at max. level and the transistor
blocks.
This switching condition remains until the level falls below the position
of the min. electrode, i.e. the relay energizes at min. level and the
transistor conducts.
The relay deenergises again at max. level and the transistor blocks.
At first, connect only ground and max. electrode to the signal
l
conditioning instrument (terminals 1 and 3)
Set the mode selection switch to mode B
l
Connect the signal conditioning instrument to power supply
l
Turn the potentiometer to position 10
l
Fill the vessel until the max. electrode is covered approx. 1 cm by
l
the product
Turn the potentiometer slowly clockwise until the yellow signal
l
lamp extinguishes
Connect the min. electrode to terminal 2 of the signal conditioning
l
instrument
The two-point control is now adapted to the conductivity of the
medium, i.e. the relay deenergises at max. level and the transistor
blocks.
This switching condition remains until the level falls below the position
of the min. electrode, i.e. the relay energizes at min. level and the
transistor conducts.
VEGATOR 631 Ex • Signal conditioning instrument