VEGA VEGAWELL 72 4 … 20 mA - Manual (Page 32)

D
eviation
-
T urn down 1 : 1 up to 5 : 1 < 0.2 %
-
T urn down up to 10 : 1 < 0.04 % x TD
Influence of the product or ambient temperature
S
pecifications refer to the set span. Turn down (TD) = 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 < 0.15 %/10 K
-
T urn down up to 5 : 1 < 0.2 %/10 K
-
T urn down up to 10 : 1 < 0.25 %/10 K
O
utside the compensated temperature range:
A verage temperature coefficient of the zero signal
-
T urn down 1 : 1 typ. < 0.15 %/10 K
Thermal change, current output
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)
S pecifications refer to the set span. Turn down (TD) = 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
32 VEGAWELL 72 • 4 … 20 mA
9 S upplement
27501
-EN
-080806