A	Gain
α	Mathematical coefficient (salt in water model)
β	Mathematical coefficient (salt in water model)
C	Pollutant agent concentration
Cfluid	Fluid capacitance between coils and ground
Cturns1	Capacitance between turns in first coil
Cturns2	Capacitance between turns in second coil
γ	Mathematical coefficient (water in oil model)
d	Wire diameter
DCu1Cu2	Distance between equivalent conductors
δ	Mathematical coefficient (water in oil model)
ε	Electric permittivity
k 1	Mathematical coefficient (salt in water model)
k 2	Mathematical coefficient (salt in water model)
k 1 ′	Mathematical coefficient (water in oil model)
k 2 ′	Mathematical coefficient (water in oil model)
l	Average length of the magnetic circuit
L1	First coil inductance
L2	Second coil inductance
lCu	Conductor’s length
Lμ	Magnetizing inductance
N	Turns number
μ	Magnetic permeability
RCu1	First coil wire resistance
RCu2	Second coil wire resistance
Rfluid	Fluid resistance between coils and ground
Rturns1	Resistance between turns in first coil
Rturns2	Resistance between turns in second coil
$\rho$	Electric resistivity
S	Magnetic gap section
SCu	Conductor’s section
Uin	Input voltage
Uout	Output voltage
Z	Impedance