7
Dielectric constants and specific gravity of main oils:
Table 5-1
Petroleum items
Animal, vegetable and other oils
Soybean oil
Cotton-seed oil
Caster oil
Olive oil
Linseed oil
Turpentine oil
3.2
3.1
4.8
3.1
3.4
2.2
0.92
0.92
0.96
0.9
0.93
0.87
(b) Oil layer depth range detectable by Apolarm-C
Oils with fluidity can be detected by Apolarm-C when the oil layer reaches a 3 ~ 5 mm
range thickness that is nearly constant regardless of the kind of oil.
As to high viscosity oil, its presence is detected when the respective oil layers which came
in contact with each of all the electrodes reach a 3 ~ 5 mm range thickness.
The item-wise thickness of oil layer detected is as shown in the following table 5-2.
Items
Dielectric constant
Specific gravity
Crude oil
Naphtha
Gasoline
Jet engine fuel
Kerosene
Xylene
Benzene
Toluene
A heavy oil
B heavy oil
C heavy oil
Paraffin oil
Styrene
Machine oil
Lubricant oil
2.2 - 2.5
2.0
2.0
1.7
2.0
2.3
2.3
2.3
2.0
2.2
2.3
2.2 - 4.7
2.4
2.1
2.3-3
0.7
0.76
0.83
0.78
0.87
0.87
0.87
0.85
0.89
0.93
0.85 or around
0.89
0.93
0.9 - 0.93
