Vega VEGADIF 65 Operating Instructions Manual page 81

Deviation determined according to the limit point method according to IEC 60770
Applies to digital interfaces (HART, Profibus PA, Foundation Fieldbus) as well as to analogue
current output 4 ... 20 mA. Specifications refer to the set span. Turn down (TD) is the ratio nominal
measuring range/set span.
Reference accuracy - all versions
The following applies to square root extracted characteristics: The accuracy data of VEGADIF 65
are entered with factor 0.5 in the accuracy calculation of the flow.
Reference accuracy - Basic version
10 mbar, 30 mbar measuring cell
Turn down 1 : 1
-
Turn down > 1 : 1
-
100 mbar measuring cell
Turn down 1 : 1 to 4 : 1
-
Turn down > 4 : 1
-
Measuring cells ≥ 500 mbar
Turn down 1 : 1 to 15 : 1
-
Turn down > 15 : 1
-
Reference accuracy - Chemical seal versions
100 mbar measuring cell
Turn down 1 : 1 to 4 : 1
-
Turn down > 4 : 1
-
Measuring cells ≥ 500 mbar
Turn down 1 : 1 to 15 : 1
-
Turn down > 15 : 1
-
Influence of the product or ambient temperature
Applies to instruments in basic version with digital signal output (HART, Profibus PA, Foundation
Fieldbus) as well as to instruments with analogue current output 4 ... 20 mA. Specifications refer
to the set span. Turn down (TD) = nominal measuring range/set span.
VEGADIF 65 • Foundation Fieldbus
±0.15 % of the set span
±0.15 % of the set span x TD
±0.075 % (±0.05 %) of the set span
±(0,012 % x TD + 0.027) of the set span
±0.075 % (±0.05 %) of the set span
±(0.0015 % x TD + 0.053) of the set span
±0.075 % (±0.05 %) of the set span + influence of
the chemical seal
±(0.012 % x TD + 0.027) of the set span + influence
of chemical seal
±0.075 % (±0.05 %) of the set span + influence of
the chemical seal
±(0.0015 % x TD + 0.053 %) of the set span +
influence of the chemical seal
14) Incl. non-linearity, hysteresis and non-repeatability.
11 Supplement
14)
81