Vega VEGABAR 66 Foundation Fieldbus - climate compensat Bedienungsanleitung Seite 48

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48
8Maintenanceandfaultrectication
VEGABAR 66 • Foundation Fieldbus - climate compensated
36793-EN-130321
F
T
:Temperaturecoecient(inuenceofmediumorambient
temperature)
F
Kl
: Deviation
F
a
: Error current output
Level measurement 1.5 mWs
Ambient temperature 40 °C, product temperature 10 °C
VEGABAR 66 with measuring range 0.2 bar
Deviation < 0.1 %
Calculation of the set Turn Down:
TD = 200 mbar/147 mbar, TD = 1.4
Basic accuracy digital output signal in percent:
F
perf
=√((F
T
)
2
+ (F
Kl
)
2
)
F
T
= (0.15 + 0.4 x TD) %
F
Kl
= 0.1 %
F
perf
=√((0.15%+0.4%x1.4)
2
+ (0.1 %)
2
)
F
perf
= 0.72 %
Total deviation digital output signal in percent:
F
total
= F
perf
+ F
stab
F
stab
= (0.1 % x 1.4)/year
F
stab
= 1.4 %
F
total
= 0.72 % + 1.4 % = 2.12 %
Total deviation digital output signal absolute:
F
total
= 2.12 % x 147 mbar/100 % = 3.11 mbar = 31.77 mm
Basic accuracy analogue output signal in percent:
F
perf
=√((F
T
)
2
+ (F
Kl
)
2
+ (F
a
)
2
)
F
T
= (0.15 + 0.4 x TD) %
F
Kl
= 0.1 %
F
a
= 0.15 %
F
perf
=√((0.15%+0.4%x1.4)
2
+ (0.1 %)
2
+ (0.15 %)
2
)
F
perf
= 0.73 %
Total deviation analogue output signal in percent:
F
total
= F
perf
+ F
stab
F
stab
= (0.1 % x 1.4)/year
F
stab
= 1.4 %
F
total
= 0.73 % + 1.4 % = 2.13 %
Total deviation analogue output signal absolute:
F
total
= 2.13 % x 147 bar/100 % = 3.13 mbar = 31.92 mm
Example
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