Vega VEGABAR 55 Profibus PA - climate compensated Bedienungsanleitung Seite 42

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42
8 Maintenance and fault rectication
VEGABAR 55 • Probus PA - climate compensated
39442-EN-130321
Error code Cause Rectication
E113 Communication con-
ict
Exchange the instrument or send it
in for repair
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Set up" may have to be carried out again.
8.3 Calculation of total deviation (according to
DIN16086)
The total deviation F
total
according to DIN 16086 is the sum of basic
accuracy F
perf
and longterm stability F
stab
. F
total
is also called maximum
practical deviation or utility error.
F
total
= F
perf
+ F
stab
F
perf
= √((F
T
)
2
+ (F
Kl
)
2
)
With the analogue signal output there is also the error of the current
output F
a
.
F
perf
= √((F
T
)
2
+ (F
Kl
)
2
+ (F
a
)
2
)
With:
F
total
: Total deviation
F
perf
: Basic accuracy
F
stab
: Long-term drift
F
T
: Temperature coecient (inuence of medium or ambient
temperature)
F
Kl
: Deviation
F
a
: Error current output
Pressure measurement in the pipeline 8 bar (800 KPa)
Product temperature 50 °C, hence within the compensated range
VEGABAR 55 with measuring range 10 bar
Calculation of the set Turn Down: TD = 10 bar/8 bar, TD = 1.25
Basic accuracy digital output signal in percent:
F
perf
= √((F
T
)
2
+ (F
Kl
)
2
)
F
T
= (0.05 % + 0.1 % x TD)
F
Kl
= 0.075 %
F
perf
= √((0.05 % + 0.1 % x 1.25)
2
+ (0.075 %)
2
)
F
perf
= 0.19 %
Total deviation digital output signal in percent:
F
total
= F
perf
+ F
stab
F
stab
= (0.1 % x TD)/year
F
stab
= (0.1 % x 1.25)/year
F
stab
= 0.125 %
F
total
= 0.19 % + 0.125 % = 0.315 %
Reactionafterfaultrecti-
cation
Total deviation
Example
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