VEGA VEGAWELL 52 4 … 20 mA_HART Pt 100 - Manual (Page 34)

-
T urn down up to 10 : 1 < 0.04 % 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. Specifications
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 with version < 0.2 %
-
T urn down 1 : 1 < 0.15 %/10 K
-
T urn down up to 5 : 1 < 0.2 %/10 K
-
T urn down up to 10 : 1 < 0.25 %/10 K
A verage temperature coefficient of the zero signal with version < 0.1 %
-
T urn down 1 : 1 < 0.05 %/10 K
-
T urn down 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. < 0.15 %/10 K
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. Specifications
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
)
W ith
-
F
t
: F
total
, total deviation
-
F
p
: F
perf
, basic accuracy
-
F
s
: F
stab
, long-term drift
-
F
T
: T emperature coefficient (influence of
medium or ambient temperature)
-
F
K l
: D eviation
34 VEGAWELL 52 • 4 … 20 mA/HART Pt
10 S upplement
35402
-EN
-111021