VEGA VEGAPULS 81 - Manual (Page 11)

VEGAPULS 64 and 81 11
Measuring system with one VEGAPULS 81 sensor (compact instru-
ment type D or E)
• Analogue, standardized 0 … 20 mA-current signal as signal output. For adjustment, a digital
adjustment signal is superimposed to the 0 … 20 mA-signal output.
• Approved in Ex Zone 0. Supply in EEx e (increased safety); output signal in EEx i (intrinsically
safe) or EEx e (increased safety).
• Adjustment and parameter adjustment via PC and the adjustment program VVO. For adjust-
ment the PC is connected via the adapter VEGACONNECT with a two-wire line to the
0 … 20 mA-signal line.
• Optionally an external digital/analogue indication. The indication can be separated from the
sensor in Ex zone 0 up to 25 m.
• The max. permissible resistance (load) of the 0 … 20 mA-signal output is 500 Ω .
In case the input resistors of the processing systems connected to the 0 … 20 mA-signal output
are less than 100 Ω , a resistor of more than 100 Ω must be switched in front of the Processing
system for the adjustment period.
The digital adjustment signal is short-circuited or damped such via too small input resistors that
the digital communication with the PC would no more be ensured.
If the 0 … 20 mA-signal output is operated without resistor (load), adjustment is also not possi-
ble. Load the 0 … 20 mA-signal output during adjustment with a load resistor of 100 Ω to 500 Ω .
4 2
2
– +
0 … 20 mA signal
output and super-
imposed digital
adjustment signal
Resistor
≥ 100 Ω
VEGACONNECT
PC with adjustment software
VEGA Visual Operating
VEGAPULS 81 F
with integral
processing
Ex-area Non-Ex-area
EEx e or
EEx i
EEx e
EEx i
Types and versions: Configuration of measuring systems
EEx i
Zone 1
Zone 0