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Capacitive electrodes EL 4 … 20 mA - compact
Output - Current output
In this window you can change the
preadjustments for the current output. Push the
button
Save
to tranfer the modified values.
Failure mode
The capacitive sensor delivers in case of failure
generally 22 mA. This value cannot be
modified.
The current output corresponds to
The parameter of the current output is always
percent with capacitive electrodes.
Invert current output
With this function you can reverse the
characteristics of the current output (4 ... 20 or
20 ... 4 mA).
Sensor optimisation
In this window you can adjust the mode of the
sensor.
Hence the phase angle of the phase selective
admittance processing (PSA) is modified.
“Mode 1“ is preadjusted.
Mode 1 = Phase angle 90
°
Mode 1 is a pure capacitance measurement,
the ohmic resistance is not considered in the
measuring result.
Application:
- standard adjustment
- non-conductive liquids up to approx. 500
µ
S
- compensation of resistance changes in
liquids
- generally with partly insulated electrodes in
liquids
- non-conductive solids without humidity
contents
- in case of bad earth of the medium
- with electrodes in conjunction with a
concentric tube
- in non-conductive vessels with earth plate
provided from outside.
Mode 2 = Phase angle 45
°
The capacitance and the ohmic resistance are
measured separately, the capacitance value is
corrected by calculation with the ohmic
resistance, so that measuring errors by
conductive build-up or modifications of the
product humity are compensated.
Application:
- high conductivity products
- adhesive, conductive products
- solids with fluctuating humidity contents
Additional functions
Offset correction
This function is required when an adjustment
should be carried out in m. This is only possible
in conjunction with oscillator CAP E 32 H Ex.
With this function the initial capacitance is
saved in the electronics. Requirement is that
the electrode is mounted in the vessel and
completely uncovered.
The offset correction is necessary when an
adjustment should be carried out without
medium.
On electrodes with concentric tube, this
function is already carried out as factory setting
as the vessel does not influence the
measurement.
The offset correction must only be repeated
when the oscillator is exchanged.
Display
Display Diagnostics
Instrument data
Configuration Services
Quit
Help
Display of measured value
Under the menu point display you can choose
the function:
• Display of measured value.
Display of measured value
In this window the actual measured value is
displayed digitally and as bargraph.
The upper bar shows the actual measured
value in percent, pF or scaled in the
appropriate unit.
The lower bar shows the actual sensor current
value in mA.
Set-up
