57
10 Supplement
VEGABAR 86 • Secondary Device for electronic differential pressure
48048-EN-220817
The basic temperature error in % from the above graphic can increase due to the additional factors,
depending on the measuring cell version (factor FMZ) and the Turn Down (factor FTD). The ad-
ditional factors are listed in the following tables.
Additional factor through measuring cell version
Measuring cell version
Measuring cell - Standard
0.1 %
0.1 % (with measuring range
25 mbar)
Factor FMZ
1
3
Additional factor through Turn Down
The additional factor FTD through Turn down is calculated according to the following formula:
F
TD
= 0.5 x TD + 0.5
In the table, example values for typical Turn downs are listed.
Turn Down
TD 1 : 1
TD 2.5 : 1
TD 5 : 1
TD 10 : 1
TD 20 : 1
Factor FTD
1
1.75
3
5.5
10.5
Long-term stability (according to DIN 16086)
Applies to the respective
digital
signal output (e.g. HART, Profibus PA) as well as to
analogue
cur-
rent output 4 … 20 mA under reference conditions. Specifications refer to the set span. Turn down
(TD) is the ratio nominal measuring range/set span.
Long-term stability zero signal and output span
Time pe-
riod
Measuring cell ø 28 mm
Measuring cell
ø 17.5 mm
Measuring ranges from
0 … +0.1 bar
(0 … +10 kPa)
Measuring range
0 … +0.025 bar/0 … +2.5 kPa
One year
< 0.05 % x TD
< 0.1 % x TD
< 0.1 % x TD
Five years
< 0.1 % x TD
< 0.2 % x TD
< 0.2 % x TD
Ten years
< 0.2 % x TD
< 0.4 % x TD
< 0.4 % x TD
Process conditions
Process temperature
Version
Measuring cell seal
Process temperature
Suspension cable PE
FKM (VP2/A)
EPDM (A+P 70.10-02)
-20 … +60 °C (-4 … +140 °F)
Suspension cable PUR
FKM (VP2/A)
EPDM (A+P 70.10-02)
-20 … +80 °C (-4 … +176 °F)
Suspension cable FEP
FKM (VP2/A)
EPDM (A+P 70.10-02)
-20 … +100 °C (-4 … +212 °F)
FFKM (Kalrez 6375)
-10 … +100 °C (+14 … +212 °F)
