VEGA Capacitive electrodes EK … with signal conditioning instrument - Manual (Page 28)

28 Capacitive electrodes EK with signal conditioning instrument
Set-up
4.2 Level detection
Vertically installed electrodes
• Set the changeover switch on the oscillator
of the electrode to stage I.
• Choose the requested mode (A - overfill
protection, B - dry run protection) on the
signal conditioning instrument.
• Fill the vessel to the requested level.
• Carry out the adjustment. Turn the potenti-
ometer on the signal conditioning instru-
ment (VEGATOR) very slowly until the
signal lamp changes condition.
Should the adjusted measuring range not
be sufficient to find the switch point, you
have to set the changeover switch to the
next higher stage (II or III). Note also the
switch point adjustment of the signal condi-
tioning instrument.
Horizontally installed electrodes
• Set the changeover switch on the oscillator
of the electrode to the appropriate stage.
Note the following conditions:
EK with E14, E15
- non-conductive medium
range 1
- conductive medium to 0,25 m range 2
to 0,25 m range 3
- EK 26 with E18 range 1
If there is no other information, the oscilla-
tors E14, E15 and E18 are preadjusted to
range 1.
• Choose the requested mode (A - overfill
protection, B - dry run protection) on the
signal conditioning instrument.
• Make sure that the integration time is
switched off (see operating instruction of
the signal conditioning instrument).
• Empty the vessel or lower the level at least
up to 100 mm below the electrode.
• Carry out the empty adjustment. Therefore
turn the potentiometer on the signal condi-
tioning instrument (VEGATOR) very slowly
clockwise until the relay control lamp lights
(mode A) or extinguishes (mode B).
- when the potentiometer on the signal
conditioning instrument is above the
value 7, you should set the changeover
switch to range 2.
• Note the position of the potentiometer.
• Fill the vessel until the electrode is com-
pletely covered.
• Carry out the full adjustment. Turn the po-
tentiometer on the signal conditioning in-
strument (VEGATOR) very slowly
clockwise until the relay control lamp lights
(mode A) or extinguishes (mode B).
• Note the position of the potentiometer.
• Set the potentiometer to the average value
of the two noted values.