VEGA VEGADIF 65 Foundation Fieldbus - Manual (Page 74)

74
11 Supplement
VEGADIF 65 • Foundation Fieldbus
36130-EN-130417
Ʋ Temperature +18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity 45 … 75 %
Ʋ Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Determination of characteristics Limit point adjustment according to IEC 61298-2
Characterstic curve Linear
Calibration position of the measuring cell Vertical, i.e. upright process component
Influence of the installation position to the
zero point
≤ 4 mbar 12)13)
A position-dependent zero-point shift can be corrected (see also chapter "Adjust parameter").
Position of the span in the measuring
range
Based on the zero point
Diaphragm material 316L, Alloy C276, gold rhodium plated, Monel
Filling oil Silicone oil
Material, lateral flanges 316L
A position-dependent zero-point shift can be corrected (see also chapter "Adjust parameter").
Deviation determined according to the limit point method according to IEC 60770
14)
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.
Deviation - 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.
Deviation - Basic version
10 mbar, 30 mbar measuring cell
Ʋ Turn down 1 : 1 ±0.15 % of the set span
Ʋ Turn down > 1 : 1 ±0.15 % of the set span x TD
100 mbar measuring cell
Ʋ Turn down 1 : 1 to 4 : 1 ±0.075 % of the set span
Ʋ Turn down > 4 : 1 ±(0.012 x TD + 0.027) % of the set span
Measuring cells ≥ 500 mbar
Ʋ Turn down 1 : 1 to 15 : 1 ±0.075 % of the set span
Ʋ Turn down > 15 : 1 ±(0.0015 x TD + 0.053) % of the set span
Deviation - Chemical seal versions
100 mbar measuring cell
Ʋ Turn down 1 : 1 to 4 : 1 ±0.075 % of the set span + influence of the chemical
seal
Ʋ Turn down > 4 : 1 ±(0.012 x TD + 0.027) % of the set span + influence of
the chemical seal
12) Max. value with horizontal process component. Specification applies to the basic version without chemical seal.
The value doubles with instruments with inert oil.
13)
14) Incl. non-linearity, hysteresis and non-repeatability.