Vega VEGABAR 87 Operating Instructions Manual page 57

Ceramic/Metal measuring cell - Standard
-12
Fig. 28: Basic temperature error F
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 ver-
sion
Factor FMZ
Additional factor through Turn Down
The additional factor FTD through Turn down is calculated according to the following formula:
F = 0.5 x TD + 0.5
TD
In the table, example values for typical Turn downs are listed.
Turn Down TD 1 : 1
Factor FTD 1
Thermal change current output through ambient temperature
Applies also to the analogue 4 ... 20 mA current output and refers to the set span.
Thermal change, current output
The thermal change of the current output corresponds to the value F
total deviation (according to DIN 16086)".
VEGABAR 87 • 4 ... 20 mA
at TD 1 : 1
TBasis
Measuring cell - Measuring cell climate-compensated, depending on measur-
Standard
0.1 % 10 bar, 25 bar
1 1
TD 2.5 : 1
1.75
1 bar, 2.5 bar
2
TD 5 : 1
3
< 0.05 %/10 K, max. < 0.15 %, each with -40 ... +80 °C
(-40 ... +176 °F)
11 Supplement
ing range
0.4 bar
3
TD 10 : 1 TD 20 : 1
5.5 10.5
in chapter "Calculation of the
a
57