Dimensions - Vega VEGABAR 82 Operating Instructions Manual

Measuring ranges from
Time period
0 ... +0.1 bar
(0 ... +10 kPa)
One year < 0.05 % x TD
Five years < 0.1 % x TD
Ten years < 0.2 % x TD
Tab. 28: Determination of the long-term stability from the table, consideration for one year: F
4. Calculation of the total deviation - 4 ... 20 mA signal
1. step: Basic deviation F
F = √((F ) + (F )
2 2
perf T Kl
F = 0.79 %
T
F = 0.2 %
Kl
F = 0.15 %
a
F = √(0.79 %) ) + (0.2 %)
2 2
perf
F = 0.83 %
perf
2. step: Total deviation F
F = F + F
total perf stab
F = (0.05 % x TD)
stab
F = (0.05 % x 2.5)
stab
F = 0.13 %
stab
F = 0.83 % + 0.13 % = 0.96 %
total
The total deviation of the measurement is hence 0.96 %.
Deviation in bar: 0.96 % of 4 bar = 0.038 bar
The example shows that the measurement error in practice can be considerably higher than the
basic deviation. Reasons are temperature influence and Turn down.

10.4 Dimensions

The following dimensional drawings represent only an extract of the possible versions. Detailed
dimensional drawings can be downloaded at www.vega.com under " Downloads" and " Drawings".
VEGABAR 82 • 4 ... 20 mA
Measuring cell ø 28 mm
perf
+ (F ) )
2
a
) + (0.15 %)
2 2
total
Measuring range
0 ... +0.025 bar
(0 ... +2.5 kPa)
< 0.1 % x TD
< 0.2 % x TD
< 0.4 % x TD
)
10 Supplement
Measuring cell ø 17.5 mm
< 0.1 % x TD
< 0.2 % x TD
< 0.4 % x TD
= 0.05 % x TD
stab
69