4 Calibrating
This section deals with the basic settings necessary for the electronic insert to
convert capacitance values into correct data on level or volume, which can then be
shown on a display unit (e.g. meter or handheld terminal).
The electronic insert can carry out basic settings in two ways:
•
On site at the electronic insert itself or
•
On the handheld terminal.
The initial basic settings can also be carried out locally at the electronic insert and
then later with the handheld terminal for, e.g. setting the type of linearisation
(Note: the electronic insert must not be locked).
Note!
•
After completing calibration the matrix should then be locked (see Section 5.1).
After locking, all entries can be called up and displayed but no longer changed.
•
The values entered can be written in the table below so that the identical values can
again be entered if the electronic insert is replaced. A complete recalibration is not
then required (see also Section 6).
4.1 Basic Calibration at the FEC 12 Electronic Insert
The following entries are required for basic calibration of the electronic insert:
•
Type of linearisation
•
Empty calibration
•
Full calibration
Note!
•
If an initial calibration is not to be carried out, but instead a recalibration of the
system, then a reset the electronic insert first.
•
This also applies when it is not clear if the electronic insert is calibrated with factory
settings (see following section). Unwanted settings may result and lead to incorrect
measured values.
Reset (recall of factory
settings)
Press the pushbuttons for empty calibration (-) and for full calibration (-)
simultaneously for approx. 5 s. This produces the following factory settings:
Significance
Factory settings
Entered values
Empty calibration [%]
0.0
Full calibration [%]
100.0
Min. current 4 mA
off
Output damping [s]
1
Value for 4 mA [%]
0.0
Value for 20 mA [%]
100.0
Safety alarm
max (110 %)
Linearisation
linear
Offset [pF]
349.90
Sensitivity [pF/%]
16.49
Set tag number
’--------’
Select unit
%
Note!
Note!
4 Calibrating
Electronic insert FEC 12 (HART)
8
Hauser
