68
10 Supplement
WIKA Operating Instructions - Process pressure transmitter CPT-2x
2. Determination temperature error F
T
50
(
F
TBasis
Fig. 42: Determination of the basic temperature error for the above example: F
TBasis
= 0.15 %
Measuring cell version
Measuring cell standard, depending on the accuracy class
0.05 %, 0.1 %
0.2 % (0.1 bar
abs
)
0.2 %
Factor FMZ
1
2
3
Tab. 22: Determination of the additional factor measuring cell for above example: F
MZ
=
3
Turn Down
TD 1 : 1
TD 2.5 : 1
TD 5 : 1
TD 10 : 1
TD 20 : 1
Factor FTD
1
1.75
3
5.5
10.5
Tab. 23: Determination of the additional factor "turn down" for the above example: F
TD
=
1.75
F
T
= F
TBasis
x F
MZ
x F
TD
F
T
= 0.15 % x 3 x 1.75
F
T
= 0.79 %
3. Determination of deviation and long-term stability
The required values for deviation F
Kl
and long-term stability F
stab
are available in the technical data:
Accuracy class
Non-linearity, hysteresis and non-repeatability
TD ≤ 5 : 1
TD > 5 : 1
0.05 %
< 0.05 %
< 0.01 % x TD
0.1 %
< 0.1 %
< 0.02 % x TD
0.2 %
< 0.2 %
< 0.04 % x TD
Tab. 24: Determination of the deviation from table: F
Kl
= 0.2 %
