Endress+Hauser FEC 22 Betriebsanleitung Seite 35

Elektronic insert FEC 22
Switch point optimisation is switched on or off using the operating elements on
the FEC 22.
Procedure
• Turn the rotary switch to
Position 2.
• When first delivered or
after a reset the extreme
left LED in the chain
lights up: switch point
optimisation
de-activated.
• Press the right key.
• The extreme right LED in
the chain lights up:
switch point optimisation
activated.
Switch point optimisation can be de-activated (Procedure see Fig. 6.2).
The FEC 22 then operates with the capacitance stored in its memory (capacitance
when empty C or capacitance when probe covered C
L
point capacitance C . The latter is no longer changed.
S
Procedure
• Turn the rotary switch to
Position 1.
• The current switch point
difference ∆C can be
read off on the LED
chain (Assigning values
see Fig. 6.3).
Note!
The current switch point difference ∆C (rotary switch in Position 1) can only be
displayed if:
• both calibrations (probe uncovered and probe covered) have been carried out
• a calibration when probe uncovered has been carried out and switch point
optimisation activated
• a calibration when probe covered has been carried out and switch point
optimisation activated
Endress+Hauser
2x OFF
1x OFF
0x OFF
>32
∆C ∆C <4 4-8 8-16 16-32
=
pF
pF pF pF pF
∆C = 0.5 x (C
- C )
H L
∆C = C
- C
S L
∆C = C
- C
H S
ON
ON
ON
1
7 3
1
7 3
) and the calculated switch
H
1
7 3
1
7 3
6 Additional Settings
Activating switchpoint
optimisation
∆ ∆
c c
Fig. 6.2
Activating switch point
optimisation
Deactivating switch
point optimisation
Current switch point
difference ∆C
Fig. 6.3
∆ ∆
Display of current switch point
c c
difference ∆ C
Note!
35