VEGA Conductive electrodes - Manual (Page 34)

34 Conductive measuring system
Set-up VEGATOR 631 Ex
1
2
3
1
2
3
Mode B
preferably as dry run protection
means with covered max.-electrode
- relay energizes, connection 12 - 14 is
connected through relay
- transistor output is conductive
- LED output lights
means with uncovered max.-electrode (level
detection) or min.-electrode (pump control)
- relay deenergizes, connection 12 - 13 is
connected through relay
- transistor output blocks
- LED output extinguishes
Switch point adjustment
Level detection for max.-signal
Pre-requirements
- Set the selection switch (13) to mode A
- Connect the signal conditioning instrument
to power supply
- Turn the potentiometer (2) to position 0
Switch point max.-signal
- Fill the vessel until the max. electrode is
covered by approx. 1 cm
- Turn the potentiometer (2) slowly clockwise
until the yellow LED extinguishes
The max. electrode is now adapted to the
product conductivity, i.e. the relay
deenergizes at max. level and the transistor
blocks.
Level detection for min.-signal
Pre-requirements
- Set the selection switch (13) to mode B
- Connect the signal conditioning instrument
to power supply
- Turn the potentiometer (2) to position 10
Switch point min.-signal
- Empty the vessel until the min. electrode is
covered by approx. 1 cm
- Turn the potentiometer (2) slowly
anticlockwise until the yellow LED
extinguishes
The min. electrode is now adapted to the
product conductivity, i.e. the relay
deenergizes at min. level and the transistor
blocks.