Vega VEGABAR 66 Operating Instructions Manual page 50
Suspension pressure transmitter with
certec measuring cell
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- Operating instructions manual (80 pages) ,
- Operating instructions manual (80 pages) ,
- Operating instructions manual (80 pages)
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8 Maintenance and fault rectification
Example
50
F
= √((F
)
+ (F
)
(+ F
2
2
perf
T
Kl
With:
•
F
: Total deviation
total
•
F
: Basic accuracy
perf
•
F
: Long-term drift
•
stab
F
: Temperature coefficient (influence of medium or ambient
T
temperature)
•
F
: Deviation
•
Kl
F
: Error current output
a
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
= √((F
)
+ (F
)
)
2
2
perf
T
Kl
F
= (0.15 + 0.4 x TD) %
T
F
= 0.1 %
Kl
F
= √((0.15 % + 0.4 % x 1.4)
perf
F
= 0.72 %
perf
Total deviation digital output signal in percent:
F
= F
+ F
total
perf
stab
F
= (0.1 % x 1.4)/year
stab
F
= 1.4 %
stab
F
= 0.72 % + 1.4 % = 2.12 %
total
Total deviation digital output signal absolute:
F
= 2.12 % x 147 mbar/100 % = 3.11 mbar = 31.77 mm
total
Basic accuracy analogue output signal in percent:
F
= √((F
)
+ (F
)
+ (F
2
2
perf
T
Kl
F
= (0.15 + 0.4 x TD) %
T
F
= 0.1 %
Kl
F
= 0.15 %
a
F
= √((0.15 % + 0.4 % x 1.4)
perf
F
= 0.73 %
perf
Total deviation analogue output signal in percent:
F
= F
+ F
total
perf
stab
F
= (0.1 % x 1.4)/year
stab
F
= 1.4 %
stab
F
= 0.73 % + 1.4 % = 2.13 %
total
VEGABAR 66 • 4 ... 20 mA/HART - climate compensated
)
)
2
a
+ (0.1 %)
)
2
2
)
)
2
a
+ (0.1 %)
+ (0.15 %)
2
2
)
2
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