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53
9 Supplement
WIKA Operating Instructions - Process pressure transmitter IPT-2x
Ceramic/Metal measuring cell - Standard
(
-12
F
TBasis
Fig. 28: Basic temperature error F
TBasis
at TD 1 : 1
The basic temperature error in % from the above graphic can increase due to the additional factors,
depending on the measuring cell version (factor FMZ) and the Turn Down (factor FTD). The ad-
ditional factors are listed in the following tables.
Additional factor through measuring cell version
Measuring cell version
Measuring cell - Standard
0.075 %, 0.1 %
0.2 %
Factor FMZ
1
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.
11)
Long-term staibility - Ceramic/metallic measuring cell
Time period
One year
< 0.05 % x TD
Five years
< 0.1 % x TD
11)
With ceramic/metallic measuring cell with gold-coated diaphragm, the values must be multiplied with factor 3.