VEGA VEGAWELL 72 4 … 20 mA_HART - Manual (Page 37)

D
eviation with version < 0.25 %
-
T urn down 1 : 1 up to 5 : 1 < 0.25 %
-
T urn down up to 10 : 1 < 0.25 % x TD
D
eviation with version < 0.1 %
-
T
urn down 1 : 1 up to 5 : 1 < 0.1 %
-
T
urn down up to 10 : 1 < 0.02 % x TD
Influence of the product or ambient temperature
A
pplies to digital HART interface as well as to analogue current output 4 … 20 mA.
S pecifications refer to the set span. Turn down (TD) is the relation nominal measuring
range/set span.
Average temperature coefficient of the zero signal
I n the compensated temperature range of 0 … +80 °C (+32 … +176 °F), reference
temperature 20 °C (68 °F).
A verage temperature coefficient of the zero signal
-
T urn down 1 : 1 < 0.05 %/10 K
-
T
urn down 1 : 1 up to 5 : 1 < 0.1 %/10 K
-
T
urn down up to 10 : 1 < 0.15 %/10 K
O
utside the compensated temperature range:
A verage temperature coefficient of the zero signal
-
T
urn down 1 : 1 typ. < 0.05 %/10 K
Thermal change, current output
A pplies also to the analogue 4 … 20 mA current output and refers to the set span.
T
hermal change, current output < 0.15 % at -40 … +80 °C (-40 … +176 °F)
Long-term stability (similar to DIN 16086, DINV 19259-1 and IEC 60770-1)
A pplies to digital HART interface as well as to analogue current output 4 … 20 mA.
S
pecifications refer to the set span. Turn down (TD) is the relation nominal measuring
range/set span.
L
ong-term drift of the zero signal < (0.1 % x TD)/year
Total deviation (similar to DIN 16086)
T he total deviation F
t
, also called practical deviation, is the sum of the basic accuracy F
p
and long-term stability:
F
t
= F
p
+ F
s
F
perf
= √((F
T
)
2
+ (F
K l
)
2
)
VEGAWELL 72 • 4 … 20 mA/HART 37
10 S upplement
27630
-
EN
-080806