ITRON Centron, Technical Reference Manual

Page: 27 / 100

CENTRON® Meter Technical Reference Guide 17
In This Chapter
CENTRON 1S, 2S CL200, and 3S ...................................................................... 17
CENTRON 2S CL320, 4S, 12/25S ...................................................................... 19
CENTRON 1S, 2S CL200, and 3S
The CENTRON meter is a solid-state meter which uses the inherent multiplication
properties of the Hall Effect to measure power. The Hall Effect principle relies on a physical
property: a conductor which carries a current in a magnetic field generates a voltage
difference across the conductor proportional to the product of the current and the magnetic
field.
The voltage V
out
created at the output of the Hall device:
V
out
= Ki
b
X B
Where
i
b
is the biasing current (derived from the line voltage)
B is the magnetic field density (derived from the line current)
K is the Hall coefficient (analogous to a gain factor in any meter)
K could be viewed as the Hall sensor intrinsic gain and is maximized by the appropriate
choice of semiconductor materials that have been uniquely optimized by Itron for the
CENTRON meter.
For the metering application, the biasing current i
b
applied to the sensor is generated from
the line voltage ( V ) using a resistor ( R ).
i
b
=V/R
The magnetic field ( B ) is generated by the line currents ( I = I1 + I2) that flow through two
conductors looped around the core.
B = C X I = C X (I
1
+ I
2
)
Where
C is a constant that is dependent upon the geometric and magnetic properties of the coil
C
H A P T E R
3
Operation: Base Metrology