Vega VEGABAR 81 4 … 20 mA_HART - Operating Instructions Bedienungsanleitung PDF herunterladen (Seite 66)

11 Supplement

VEGABAR 81 • 4 … 20 mA/HART

45018-EN-131010

Reference conditions and actuating variables (according to DIN EN 60770-1)

Reference conditions according to DIN EN 61298-1

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 psi)

Determination of characteristics Limit point adjustment according to IEC 61298-2

Characterstic curve Linear

Reference installation position upright, diaphragm points downward

Inuenceoftheinstallationposition depending on the chemical seal version

Deviation (according to IEC 60770)

Applies to the digitalsignaloutput(HART,ProbusPA,FoundationFieldbus)aswellastothe

analogue current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio nominal

measuring range/set span.

Accuracy class Non-linearity, hysteresis and re-

peatability with TD 1 : 1 up to 5 : 1

Non-linearity, hysteresis and re-

peatability with 5 : 1

0.2 % < 0.2 % < 0.04 % x TD

Inuenceoftheproductorambienttemperature

Thermal change zero signal and output span

Applies to the digitalsignaloutput(HART,ProbusPA,FoundationFieldbus)aswellastothe

analogue current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio nominal

measuring range/set span.

Averagetemperaturecoecient

zero signal

In the compensated tem-

perature range 10 … +70 °C

(+50 … +158 °F)

Outside the compensated tem-

perature range

Turn down 1 : 1 < 0.05 %/10 K typ. < 0.05 %/10 K

Turn down 1 : 1 up to 5 : 1 < 0.1 %/10 K -

Turn down up to 10 : 1 < 0.15 %/10 K -

Thermal change, current output

Applies also to the analogue 4 … 20 mA current output and refers to the set span.

Thermal change, current output < 0.05 %/10 K, max. < 0.15 %, each with -40 … +80 °C

(-40 … +176 °F)

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Vega VEGABAR 81 4 … 20 mA_HART - Operating Instructions Bedienungsanleitung Seite 66