Pricing & Availability

F.W. Bell Closed Loop Current Sensors

Fast Response Excellent Linearity
Wide Bandwidth Low Temperature Drift

A closed loop current sensor consists of a Hall sensor mounted in an air gap of a magnetic core, a coil wound around the core and a current amplifier. The current carrying conductor placed through the aperture of the sensor produces a magnetic field that is proportionate to the current.  This field is concentrated by the core and sensed by the Hall sensor. The Hall sensor is connected to the input of the current amplifier, which drives the coil.  The current through the coil produces an opposing field to that provided by the current through the aperture,thus the flux in the core is constantly driven to zero. The coil connects to the output of the sensor.  Therefore the output is a current proportional to the aperture current, multiplied by the number of turns on the coil. A sensor with a 1000 turn coil provides an output of 1mA per ampere. The current output is converted to a voltage by connecting a resistor between the output of the sensor and ground. The output is scaled by selecting the resistor value.  Closed loop sensors measure DC and AC currents and provide electrical isolation. They offer fast response, high linearity and low temperature drift. The current output of the closed loop sensor is relatively immune to electrical noise. They are the sensor of choice when high accuracy is essential.

 

Product Index

 

Model

Rated
Current
(A)

Rated
Output
(mA)

Accuracy
(+%)
at +25o

Frequency Range
from DC

Primary
Aperture
(inches)

Mounting

CLS-25

25

25

0.5

200 kHz

Lead

PCB

CLN-25

25

25

0.5

150 kHz

Lead

PCB

CLN-50

50

50

0.5

150 kHz

.53x.39

PCB

CLN-100

100

100

0.5

150 kHz

.53x.39

PCB

CLN-50SP1

50

50

0.5

150 kHz

Lead

PCB

CLN-100SP1

100

100

0.5

150 kHz

Lead

PCB

CLN-200

200

100

0.5

150 kHz

0.906

Panel

CLN-300

300

150

0.5

150 kHz

0.906

Panel

CLN-300SP1

300

150

0.5

150 kHz

Bus Bar

Panel

CLN-500SP1

500

100

0.5

100 kHz

Bus Bar

Panel

CLN-500

500

100

0.5

100 kHz

1.023

Panel

CLN-1000

1000

200

0.3

150 kHz

1.73

Panel

CLO-300

300

150

0.5

150 kHz

0.905

Panel

CLO-500

500

100

0.3

100 kHz

1.024

Panel

LS-300

300

100

0.3

100 kHz

.98x.75

Panel

LS-1000

1000

200

0.3

100 kHz

1.73

Panel