Vega VEGABAR 81, Руководство по эксплуатации, Страница: 56 / 72

56
11 Supplement
VEGABAR 81 • 4 … 20 mA
45025-EN-140228
Average temperature coefficient,
zero signal
In the compensated tem-
perature range 10 … +70 °C
(+50 … +158 °F)
Outside the compensated tem-
perature range
Turn down 1 : 1 < 0.05 %/10 K typ. < 0.05 %/10 K
Turn down 1 : 1 up to 5 : 1 < 0.1 %/10 K -
Turn down up to 10 : 1 < 0.15 %/10 K -
Thermal change, current output
Applies also to the analogue 4 … 20 mA current output and refers to the set span.
Thermal change, current output < 0.05 %/10 K, max. < 0.15 %, each with -40 … +80 °C
(-40 … +176 °F)
0,15 %
-0,15 %
-40°C -20°C
20°C
40°C 60°C 80°C
Fig. 29: Thermal change, current output
Additional temperature influence through chemical seal
The specifications refer to diaphragm material 316L as well as isolating liquid silicone oil. They are
only used for estimation. The actual values depend on the diameter, material and strength of the
diaphragm as well as the isolating liquid. They are available on request.
Temperature coefficient of the chemical seal in mbar/10 K with
Ʋ Flange DN 50 PN 40, Form C,
DIN 2501
1.2 mbar/10 K
Ʋ Flange DN 80 PN 40, Form C,
DIN 2501
0.25 mbar/10 K
Ʋ Flange DN 80 PN 40, Form C,
DIN 2501 with extension 50 mm
1.34 mbar/10 K
Ʋ Flange 2" 150 lbs RF, ANSI B16.5 1.2 mbar/10 K
Ʋ Flange 3" 150 lbs RF, ANSI B16.5 0.25 mbar/10 K
Ʋ Flange 3" 150 lbs RF, ANSI B16.5 with
extension 2 "
1.34 mbar/10 K
Temperature coefficient of a cooling ele -
ment, depending on the diaphragm-ø
0.1 … 1.5 mbar/10 K
Temperature coefficient of a 1 m
long capillary line, depending on the
diaphragm-ø
0.1 … 15 mbar/10 K