56
9 Supplement
WIKA Operating Instructions - Process pressure transmitter CPT-2x
Additional factor through measuring cell version
Measuring cell version
Measuring cell standard, depending on the accuracy class
0.05 %, 0.1 %
0.2 % (with measuring
range 0.1 bar
abs
)
0.2 %
0.05 %, 0.1 % with meas-
uring range 25 mbar
Factor FMZ
1
2
3
Additional factor through Turn Down
The additional factor FTD through Turn down is calculated according to the following formula:
F
TD
= 0.5 x TD + 0.5
In the table, example values for typical Turn downs are listed.
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
Long-term stability (according to DIN 16086)
Applies to the respective digital signal output (e.g. HART, Profibus PA) as well as to analogue cur-
rent output 4 … 20 mA under reference conditions. Specifications refer to the set span. Turn down
(TD) is the ratio nominal measuring range/set span.
Long-term stability zero signal and output span
Time pe-
riod
Measuring cell ø 28 mm
Measuring cell ø 17.5 mm
Measuring ranges
from
0 … +0.1 bar
(0 … +10 kPa)
Measuring range
0 … +0.025 bar
(0 … +2.5 kPa)
All process fittings
7)
Process fitting G½
(ISO 228-1)
One year
< 0.05 % x TD
< 0.1 % x TD
< 0.1 % x TD
< 0.25 % x TD
Five years < 0.1 % x TD
< 0.2 % x TD
< 0.2 % x TD
< 0.5 % x TD
Ten years < 0.2 % x TD
< 0.4 % x TD
< 0.4 % x TD
< 1 % x TD
7)
without process fitting G½ (ISO 228-1)
