VEGA VEGABAR 64 Foundation Fieldbus - Manual (Page 57)

Nominal range Overload, max. pressure Overload, min. pressure
0 … 900 psi 2900 psi 0 psi
Reference conditions and actuating variables (similar to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
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Temperature +15 … +25 °C (+59 … +77 °F)
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Relative humidity 45 … 75 %
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Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Determination of characteristics Limit point adjustment according to IEC 61298-2
Characteristics linear
Reference installation position upright, diaphragm points downward
Influence of the installation position < 0.2 mbar/20 Pa (0.003 psig)
Deviation determined according to the limit point method according to IEC 60770 11)
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 relation
nominal measuring range/set span.
Deviation
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Turn down 1 : 1 up to 5 : 1 < 0.075 %
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Turn down > 5 : 1 < 0.015 % x TD
Deviation with absolutely flush process fittings EV, FT
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Turn down 1 : 1 up to 5 : 1 < 0.05 %
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Turn down > 5 : 1 < 0.01 % x TD
Deviation with absolute pressure measuring range 0.1 bar
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Turn down 1 : 1 up to 5 : 1 < 0.25 % x TD
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Turn down > 5 : 1 < 0.05 % x TD
Influence of the product or ambient temperature
Applies also to instruments with analogue 4 … 20 mA current output and refers to the set span.
Thermal change zero signal and output span, reference temperature 20 °C (68 °F):
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In the compensated temperature range
0 … +100 °C (+32 … +212 °F) < (0.05 % + 0.1 % x TD)
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Outside the compensated temperature
range < (0.05 % + 0.15 % x TD)
11) Incl. non-linearity, hysteresis and non-repeatability.
VEGABAR 64 • Foundation Fieldbus 57
10 Supplement
28259
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EN
-081209