Vega VEGABAR 66 4 … 20 mA_HART Bedienungsanleitung PDF herunterladen (Seite 58)

10 Supplement

VEGABAR 66 • 4 ... 20 mA/HART

36737-EN-130321

Deviation determined according to the limit point method according to IEC 60770

12)

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

logue

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

measuring range/set span.

Deviation

Ʋ Turn down 1 : 1 up to 5 : 1 < 0.1 %

Ʋ Turn down > 5 : 1 < 0.02 % 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ana-

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

measuring range/set span.

Thermalchangezerosignalandoutputspan,referencetemperature20°C(68°F):

Ʋ In the compensated temperature

range 0 … +100 °C (+32 … +212 °F)

< 0.05 %/10 K x TD

Ʋ Outside the compensated tempera-

ture range

typ. < 0.05 %/10 K x TD

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)

0,15 %

-0,15 %

-40°C -20°C

20°C

40°C 60°C 80°C

Fig. 33: Thermal change, current output

Long-termstability(accordingtoDIN16086andIEC60770-1)

Applies to digital HART interface as well as to analogue current output 4 … 20 mA under refer-

enceconditions.Specicationsrefertothesetspan.Turndown(TD)istherelationnominalmeas-

uring range/set span.

Long-termdriftofthezerosignal:

Ʋ For one year < 0.05 % x TD

Ʋ Forveyears < 0.1 % x TD

Ʋ For ten years < 0.2 % x TD

12)

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

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