VEGA VEGADIF 55 4 … 20 mA_HART - Manual (Page 68)

F ill the minus effective pressure line on the height of the
condensation pot
3 V ent instrument
O
pen valve 2 and 4: Discharge medium
O pen valve 3: Equalisation plus and minus side
B riefly open valve 6 and 7, then close again: Fill the measuring
instrument completely with the medium and remove air
4 S et measurement loop to operation
C lose valve 3: Separate plus and minus side
O pen valve 4: Connect minus side
N ow:
V alve 3, 6 and 7 are closed
V
alve 2, 4 A and B are open.
5 C arry out adjustment, see end of chapter "Level measurement"
A quick setup menu is available for the modes flow, level and
pressure, leading you through the most important basic functions.
F or level measurement, the three level modes are also available "Level
Easy Pressure", "Level Easy Height" and "Level Standard". For the
level mode "Level Standard" you can choose between the level types
"
L inear", "Pressure linearized" and "Height linearized". The chart in the
following chapter "Overview level measurement" gives an overview of
the different applications.
W
ith the level modes "Level Easy Pressure" and "Level Easy Height"
the entered vaues are subjected to a lower scope of tests than with the
level mode "Level Standard". For the level modes "Level Easy
Pressure"
and "Level Easy Height" a min. distance of 1 % must be
maintained for the entered values for EMPTY CALIB./FULL CALIB.,
EMPTY PRESSURE/FULL PRESSURE, EMPTY HEIGHT/FULL
HEIGHT
and SET LRV/SET URV. If the values are too close together,
the values will be denied with a message. Further limit values are not
checked, i.e. the entered parameters must fit the sensor and
application so that the measuring instrument can carry out a correct
measurement.
T he level modes "Level Easy Pressure" and "Level Easy Height"
comprise less parameters than the mode "Level Standard" and is used
for quick and easy parameter adjustment of a level application.
C ustomer-specific level, volume and measuring units or a linearisation
chart can be only entered with level mode "Level Standard".
I f the instrument should be used as part system in a safety function
(SIL), an "Instrument parameter adjustment with increased parameter
adjustment reliability" (group SAFETY CONFIRM) for mode "Level" is
only possible for the mode "Level Easy Pressure". After adjustment of
a password, all previously entered parameters are checked. If the
mode "Level Easy Height" or "Level Easy Pressure" was selected
Information on level
measurement
68 VEGADIF 55 • 4 … 20 mA/HART
7 S et up
31731
-EN
-081119