Siemens LC 500 사용자 설명서
Page 92
SITRANS LC 500 – INSTRUCTION MANUAL
7ML19985GE01
mmm
mm
Appendix E
After calibration:
12.7 pF
≅
0%
≅
4 mA or 20 mA
25.4 pF
≅
100%
≅
20 mA or 4 mA
Larger tank, dimensions in feet:
For this slightly larger tank, the capacitance
ranges from 16.6 pF for 0% (probe in air) to 33.2 pF
for 100% (tank filled with oil).
After calibration:
16.6 pF
ranges from 16.6 pF for 0% (probe in air) to 33.2 pF
for 100% (tank filled with oil).
After calibration:
16.6 pF
≅
0%
≅
4 mA or 20 mA
33.2 pF
≅
100%
≅
20 mA or 4 mA
Cair
ε
air
7.32 4.5
×
Log 60 0.63
⁄
(
)
----------------------------------- pF
16.6pF
=
=
Coil
ε
oil
7.32 4.5
×
Log 60 0.63
⁄
(
)
----------------------------------- pF
33.2pF
=
=
SITRANS LC
500
6” (0.5ft)
L = 54”
(4.5ft)
60”
(5.0ft)
d = 0.63”