Closed loop current sensor CSNE151-005 Honeywell application

Thread Starter


Joined Sep 2, 2018
I'm using this sensor.
1. For a given real current in conductor (suppose 1 A) what is the current out of O/P? In the data sheet there's no turn ratio..., so how can I calculate the output current?
2. Are there example of conditioning/amplifier circuits for this sensor?

Thank you


Joined Aug 27, 2009
From the datasheet: Coil Turns 1000
The CSN Series of closed loop current sensors are based on the principles of the Magnetoresistive or Hall effects, and the null balance or zero magnetic flux method (feedback system). The magnetic flux in the sensor core is constantly controlled at zero. The amount of current required to balance zero flux is the measure of the primary current flowing through the conductor, multiplied by the ratio of the primary to secondary windings. This closed loop current is the output from the device and presents an image of the primary current reduced by the number of secondary turns at any time. This current can be expressed as a voltage by passing it through a resistor.
For 1A input current with at 1000 coil turn ratio you get a 1mA output current flowing across R. With a precision resistor for R of 100 ohm the voltage across it is 0.1 volts (per Amp).