VEGA VEGAMET 407 AFT - Manual (Page 6)

6 VEGAMET 407 AF/AFT
- Feed supply voltage. The voltage must comply
with the figure stated on the wiring diagram.
- Adjust changeover switch on the back of the
instrument or on the front plate to the desired
current output range 0 … 20 mA or 4 … 20 mA
- turn potentiometer for integration time complete-
ly anti-clockwise
- potentiometer for full adjustment must be turned
clockwise by 22 turns
- Carry out adjustment as follows
Adjustment
The full or empty adjustment is carried out by a
spindle potentiometer. Overwinding is avoided by
the slide clutch. In practice three different methods
are possible for empty / full adjustment:
a) Level in the vessel can be filled to the
required min. level (= 0 %) and max. level
(= 100 %)
Empty adjustment
-
Reduce product to required min. level.
- Adjust with potentiometer for empty adjustment
the indication of the instrument to 0 %.
Full adjustment
-
Increase product to required max. level.
- Adjust with potentiometer for full adjustment the
indication of the instrument to 100 %.
Integration time
-
Adjust potentiometer for integration time to
required value (see page 2).
b) Level in the vessel can be filled to the
required min. level (= 0 %), but only to a max.
level < 100 %
Empty adjustment
-
Reduce product to required min. level.
- Adjust with potentiometer for empty adjustment
the indication of the instrument to 0 %.
Full adjustment
-
Increase product to max. possible level and
dipcheck (e.g. 80 %)
- Adjust with the potentiometer for full adjustment
the indication of the instrument to the checked
value.
Integration time
-
Adjust potentiometer for integration time to
required value (see page 2).
c) Level in the vessel can only be reduced to a
min. level > 0 % and to a max. level
≤
100 %
Empty adjustment
-
Reduce product to min. possible level and
dipcheck (e.g. 20 %)
- Adjust with the potentiometer for empty adjust-
ment the indication of the instrument to the
checked value.
Full adjustment
-
Increase level to max. possible level and
dipcheck (e.g. 60 %)
- Calculate indication value to be adjusted:
max. level minus min. level = indicating value to
be adjusted.
in the example: 60 % - 20 % = 40 %
- Set with the potentiometer for full adjustment the
indication of the instrument to the calculated
value (in the example 40 %).
- Set with the potentiometer for empty adjustment
the indication of the instrument to the actual
level (max. level in the example 60 %).
Integration time
-
Adjust with potentiometer for integration time to
required value.
407 AF
100 0
50
%
tj
0
VEGAMET
Start-up
Fixing screw
Fixing screw
Mains control lamp
Indication instrument
Signal lamp
Potentiometer
for full adjustment
Potentiometer
for empty adjustment
Potentiometer
for integration time