VEGA VEGABAR 41 4 … 20 mA - Manual (Page 26)

26 VEGABAR 41 (4 … 20 mA)
6 Instrument modification
6.1 Exchange of adjustment
modules
The modular construction of VEGABAR allows
retrofitting, interchange or removal of the
display module. Data previously saved (e.g.
adjustment values) are not stored in the ad-
justment module but in an EEPROM of the
sensor electronics and therefore readjust-
ment is not necessary. The connection of the
modules is made via a 4-pole plug connec-
tion.
VEGABAR
Module
without
adjustment Module for
menu-driven
adjustment Module for
basic
functions
Display
module
Diagnostics, Instrument modification
External
energy source
Checking pressure compensation
Open the housing of VEGABAR. The meas-
ured value must not change. However, if the
displayed value changes, compensation of
the atmospheric pressure is not ensured,
which will lead to distortion of the measured
value. Check the breather on the VEGABAR-
housing.
Checking the electrical components
Voltage
- the terminal voltage on VEGABAR must be
at least 12 V DC
Current
Current value Condition
3.8 … 20.5 mA standard range for the output
current
0 mA signal line interrupted
< 3.6 mA sensor electronics or pressure
sensor element defective
22 mA shortcircuit in the signal line,
sensor electronics or pressure
sensor element defective
~
1 2 3
+
–
– – +
mA
Voltage Current
V
Ammeter for local
control mA