VEGA VEGABAR 86 4 … 20 mA_HART - Operating Instructions User Manual

Page 65

11 Supplement

VEGABAR 86 • 4 … 20 mA/HART

45039-EN-131010

Resolution

< 0.2 K

Accuracy

Ʋ in the range of 0 … +100 °C

(+32 … +212 °F)

±2 K

Ʋ In the range of -60 … 0 °C

(-76 … +32 °F) and +100 … +150 °C

(+212 … +302 °F)

typ. ±4 K

Reference conditions and actuating variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1

Ʋ Temperature

+15 … +25 °C (+59 … +77 °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

Reference installation position

upright, diaphragm points downward

Influence of the installation position

< 0.2 mbar/20 Pa (0.003 psig)

Deviation (according to IEC 60770)
Applies to the digital signal output (HART, Profibus 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.
The specified values correspond to the value F

in chapter "Calculation of the total deviation".

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

0.1 %

< 0.1 %

< 0.02 % x TD

Influence of the product or ambient temperature
Thermal change zero signal and output span
Applies to the digital signal output (HART, Profibus 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.
The thermal change of zero signal and output span corresponds to the value F

in chapter "Calcu-

lation of the total deviation (according to DIN 16086)".
Ceramic measuring cell - Standard

Medium or ambient temperature T
-40 … 0 °C (-40 … +32 °F)

< {0.15 % + 0.015 %/K x (-T)} x {0.5+0.5 x TD}

0 … +40 °C (+32 … +104 °F)

< {0.0075 %/K x (T - 20 °C)} x {0.5+0.5 x TD}

+40 … +100 °C (+104 … +212 °F)

< {0.15 % } x {0.5+0.5 x TD}

+100 … +120 °C (+212 … +248 °F)

< {0.15 % + 0.005 %/K x (T - 100 °C)} x {0.5+0.5 x TD}

Ceramic measuring cell - climate compensated
Compensated temperature range

0 … +100 °C (+32 … +212 °F)