HT(HPC)-100CT Series
HITROL CO., LTD. 3
Introduction
Characteristics
Operation
Principle
■ Excellent degree of precision
■ Semipermanent solid structure with no mechanical driving part
■ Various probe forms according to the purpose of use
■ Effortless installation of wire forms (HT-100CTW-2); easily used for corrosive liquid (solution)
■ Interface between water and oil can be measured.
■ Explosionproof enclosure available (Ex d IIC T6/T4); (HPC-100CT-2 Series)
The HT(HPC)-100CT-2 Series is a water level transmitter that continuously measures the
change of tank level using the permittivity of the liquid. It can be easily installed and
calibrated and can simply be used even for corrosive liquid. The HT(HPC)-100CT-2 Series
is generally used to measure the liquid in various areas such as pure water, industrial
water, oil tanks, and chemical tanks.
When the level between the electrode probe and electrode wall increases, the air around the
electrode probe is replaced by other dielectric substances (measured object), and the value of
the electrostatic capacity changes according to the level. The electrode probe has the initial
low value of electrostatic capacity when it is in the air, but the value of the electrostatic
capacity increases if the measured object increases and covers the electrode probe. If there
are two insulated conductors, the electrostatic capacity is decided by the size of the two
conductors, relative location, and the permittivity of the medium (contents) existing in the
two conductors. The following formula shows the change of the electrostatic capacity (ΔC)
when a substance with ε₂ permittivity is filled to l level if the air permittivity is ε₁ between
the two conductors on a concentric circle.
ΔC =
Here,
log D/d
(
ε₂ ε₁
X l
-
)
is constant as initial conditions. Thus, if you regard it as Constant K, ΔC is decided only by l,
the height of the substance you want to measure. Therefore, if you measure ΔC,
you can identify the current position of Level.
log D/d
(ε₂ ε₁X l
-
)
[pF]
