Calibration When Free; Calibration When Covered; Calibration When Free And Covered - Endress+Hauser FEC 22 Betriebsanleitung

5 Commissioning
Fig. 5.2
Calibration when probe
uncovered
Fig. 5.3
Calibration when probe
covered
Note!
32
5.2 Calibration when probe uncovered
OFF
1
7
2 s
After a calibration with an uncovered probe the capacitance when empty (C
is then determined by the threshold value ∆C (factory-set
The switch point C
S
value = 2 pF) with C = C
S
5.3 Calibration when probe covered
OFF
1
7
2 s
After calibration with a covered probe the capacitance when probe covered (C
stored. The switch point C
value = 2 pF) with C = C
S
5.4 Calibration when probe uncovered and covered
A calibration with both uncovered and covered probe is recommended to ensure
maximum operational safety. An uncovered or covered probe calibration can always
be supplemented at a later date by an appropriate covered or uncovered probe
calibration. When both calibrations are carried out, the current switch point will be
placed halfway between the two calibration points. The switch point is specified by
C = 0.5 x (C + C ). See Section 5.2 and 5.3 for carrying out a calibration with both
S L H
uncovered and covered probe.
Note!
Switch point optimisation can no longer be activated when both an uncovered and
covered calibration has been carried out. Should it be active when a supplementary
calibration is to be carried out, then the function is automatically switched off.
Procedure
ON • To calibrate an uncovered probe, turn
the rotary switch to Position 6.
• When first delivered or after a reset the
extreme left LED in the chain lights up:
no calibration carried out.
• Press the right key for 2 s.
3
• The extreme right LED in the chain
lights up. The calibration has been
acknowledged and stored.
1
• The instrument is now on stand-by.
7
3
+ ∆C.
L
Procedure
ON
• To calibrate a covered probe turn the
rotary switch to Position 8.
• When first delivered or after a reset the
extreme left LED in the chain lights up:
no calibration carried out.
• Press the right key for 2 s.
3
• The extreme right LED in the chain
lights up. The calibration has been
acknowledged and stored
1
• The instrument is now on stand-by.
3
7
is then determined by the threshold value ∆C (factory-set
S
- ∆C.
H
Elektronic insert FEC 22
) is stored.
L
) is
H
Endress+Hauser