Vega VEGABAR 87 Operating Instructions Manual page 72
Submersible pressure transmitter with metal measuring cell
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Also See for VEGABAR 87:
- Operating instructions manual (80 pages) ,
- Quick setup manual (24 pages) ,
- Operating instructions manual (84 pages)
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11 Supplement
VEGABAR 86
Time pe-
riod
All measuring ranges
One year
< 0.05 % x TD
Five years
< 0.1 % x TD
Ten years
< 0.2 % x TD
VEGABAR 87
Time period
One year
Five years
Ten years
Tab. 27: Determination of the long-term stability from the table, consideration for one year: F
0.05 % x 2.6 = 0.13 %
4. Calculation of the total deviation - HART signal
- 1. step: Basic accuracy F
F
= √((F
)
+ (F
)
)
2
2
perf
T
Kl
F
= 0.26 %
T
F
= 0.1 %
Kl
F
= √(0.26 %)
+ (0.1 %)
2
perf
F
= 0.28 %
perf
- 2. step: Total deviation F
F
= F
+ F
total
perf
stab
F
= 0.28 % (result of step 1)
perf
F
= (0.05 % x TD)
stab
F
= (0.05 % x 2.5)
stab
F
= 0.13 %
stab
F
= 0.28 % + 0.13 % = 0.41 %
total
5. Calculation of the total deviation - 4 ... 20 mA signal
- 1. step: Basic accuracy F
F
= √((F
)
+ (F
)
2
2
perf
T
Kl
F
= 0.26 %
T
F
= 0.2 %
Kl
F
= 0.15 %
a
F
= √(0.26 %)
)
+ (0.1 %)
2
2
perf
F
= 0.32 %
perf
- 2. step: Total deviation F
F
= F
+ F
total
perf
stab
72
Measuring cell ø 28 mm
Measuring range
0 ... +0.025 bar/0 ... +2.5 kPa
< 0.1 % x TD
< 0.2 % x TD
< 0.4 % x TD
All measuring ranges
< 0.05 % x TD
< 0.1 % x TD
< 0.2 % x TD
perf
)
2
total
perf
+ (F
)
)
2
a
) + (0.15 %)
2
2
total
)
Measuring cell
ø 17.5 mm
< 0.1 % x TD
< 0.2 % x TD
< 0.4 % x TD
Measuring range
0 ... +0.025 bar/0 ... +2.5 kPa
< 0.1 % x TD
< 0.2 % x TD
< 0.4 % x TD
= 0.05 % x TD =
stab
VEGABAR 87 • 4 ... 20 mA/HART
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