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60
10 Supplement
VEGABAR 86 • Secondary Device for electronic differential pressure
48048-EN-220817
Ʋ U
B min
with lighting switched on
16 V DC
Ʋ U
B max
Depending on the signal output and version of the
Primary Devices
Potential connections and electrical separating measures in the instrument
Electronics
Not non-floating
Galvanic separation
Ʋ between electronics and metallic parts
of the device
Reference voltage 500 V AC
Conductive connection
Between ground terminal and metallic process fitting
Electrical protective measures
11)
Housing material
Version
Protection acc. to
IEC 60529
Protection acc. to
NEMA
Plastic
Single chamber
IP66/IP67
Type 4X
Aluminium
Single chamber
IP66/IP67
IP66/IP68 (0.2 bar)
IP66/IP68 (1 bar)
Type 6P
Stainless steel (electro-polished) Single chamber
IP66/IP67
IP69K
Type 4X
Stainless steel (precision cast-
ing)
Single chamber
IP66/IP67
Type 4X
IP66/IP68 (0.2 bar)
IP66/IP68 (1 bar)
Type 6P
Stainless steel
Transmitter, version with exter-
nal housing
IP68 (25 bar)
-
Altitude above sea level
Ʋ by default
up to 2000 m (6562 ft)
Ʋ with connected overvoltage protection
on the Primary Device
up to 5000 m (16404 ft)
Pollution degree
12)
4
Protection rating (IEC 61010-1)
II
10.2 Calculation of the total deviation
The total deviation of a pressure transmitter indicates the maximum measurement error to be ex-
pected in practice. It is also called maximum practical deviation or operational error.
According to DIN 16086, the total deviation F
total
is the sum of the basic deviation F
perf
and the long-
term stability F
stab
:
F
total
= F
perf
+ F
stab
The basic deviation F
perf
in turn consists of the thermal change of the zero signal and the output
span F
T
(temperature error) as well as the deviation F
Kl
:
F
perf
= √((F
T
)
2
+ (F
Kl
)
2
)
11) Protection rating IP66/IP68 (0.2 bar) only in conjunction with absolute pressure, as no air compensation is
possible when the sensor is completely flooded