Vega VEGABAR 64 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 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

- Temperature +15 … +25 °C (+59 … +77 °F)

- Relative humidity 45 … 75 %

- 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

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

- Turn down 1 : 1 up to 5 : 1 < 0.075 %

- Turn down > 5 : 1 < 0.015 % x TD

Deviation with absolutely ﬂush process ﬁttings EV, FT

- Turn down 1 : 1 up to 5 : 1 < 0.05 %

- Turn down > 5 : 1 < 0.01 % x TD

Deviation with absolute pressure measuring range 0.1 bar

- Turn down 1 : 1 up to 5 : 1 < 0.25 % x TD

- 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 sp an, reference temperature 20 °C (68 °F):

- In the compensated temperature range

0 … +100 °C (+32 … +212 °F)

< (0.05 % + 0.1 % x TD)

- Outside the compensated temperature

range

< (0.05 % + 0.15 % x TD)

Incl. non-linearity, hysteresis and non-repeatability.

VEGABAR 64 • 4 … 20 mA/HART 57

10 Supplement

27525-EN-081209

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Vega VEGABAR 64 4 … 20 mA_HART Bedienungsanleitung Seite 57