Zeroflux Current Transducers

Zeroflux current sensors measure AC and DC current with very high accuracy. They are available in closed body type and clamp type ('jaws' can be opened). Accuracy is less than 3ppm for closed body type due to the zeroflux measurement method. Bandwidth is very high, up to 500 kHz for 1000A sensors with closed body type. The current carrying cable to be measured has to be routed through the central hole in the sensor. They are available in measurement ranges from 20A to 2000A. The output type can be a secondary current or voltage output. All sensors are isolated for high electrical safety with CAT III electrical safety rating. Applications include power analysis of electric inverters and motors, electric drivetrains, electric vehicles, generators, wind turbines, and general data acquisition.

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CURRENT CLAMP 20 AMPS AC/DC

Current clamp CT6841A

20 A AC/DC range
0.1 V/A sensitivity
±0.3 % rdg. ±0.05 % f.s. accuracy at DC
Fits conductor diameter up to 20mm

Current clamp 200 Amps AC/DC

Current clamp CT6843A

200 A AC/DC range
0.01 V/A sensitivity
±0.3 % rdg. ±0.02 % f.s. accuracy at DC
Fits conductor diameter up to 20mm

Current clamp 500 Amps AC/DC

Current clamp CT6845A

500 A AC/DC range
4 mV/A output
±0.3 % rdg. ±0.02 % f.s. accuracy at DC
Fits conductor diameter up to 20mm

CURRENT CLAMP 1000 AMPS AC/DC

Current clamp CT6846A

1000 A AC/DC range
2mV/A sensitivity
±0.3 % rdg. ±0.01 % f.s. accuracy at DC
Fits conductor diameter up to 50mm

Current Transducer 0 to 50A RMS

Current transducer DT50ID

+/-50A DC / 50A RMS primary nominal current
0 +/-100 mA secondary current
Linearity error =<1.5 ppm
>2000 kHz bandwidth

Current Transducer 0 to 100A RMS

Current transducer DT100ID

+/-100A DC / 100A RMS primary nominal current
0 +/-100 mA secondary current
Linearity error =<1 ppm
>2000 kHz bandwidth

Current Transducer 0 to 200A RMS

Current transducer DT200ID

+/-200A DC / 200A RMS primary nominal current
0 +/-200 mA secondary current
Linearity error =<1 ppm
>2000 kHz bandwidth

Wideband Current Transducer 0 to 500A RMS

Current transducer DW500UB-2V

±500A DC / 500A RMS primary nominal current
0 ±2V secondary voltage
Linearity error ±10 ppm
Bandwidth 10 MHz

Current Transducer 0 to 600A RMS

Current transducer DS600ID

+/-900A DC / 600A RMS primary nominal current
0 +/-600 mA secondary current
Linearity error +/-1 ppm
>500 kHz bandwidth

Current Transducer 0 to 600A RMS DC

Current transducer DS600UB-10V

+/-600A DC / 424A RMS primary nominal current
0 +/-10V secondary voltage
Linearity error +/-40 ppm
>300 kHz bandwidth

Current Transducer 0 to 1000A RMS

Current transducer DN1000ID

+/-1000A DC / 1000A RMS primary nominal current
0 +/-666.67 mA secondary current
Linearity error +/-1 ppm
>400 kHz bandwidth

Current Transducer 0 to 1000A RMS DC

Current transducer DS1000UB-10V

+/-1000A DC / 700A RMS primary nominal current
0 +/-10V secondary voltage
Linearity error +/-35 ppm
>300 kHz bandwidth

Current Transducer 0 to 1200A RMS

Current transducer DM1200ID

+/-1500A DC / 1200A RMS primary nominal current
0 +/-1000 mA secondary current
Linearity error +/-1 ppm
>400 kHz bandwidth

Current Transducer 0 to 1200A RMS DC

Current transducer DM1200UB-10V

+/-1200A DC / 850A RMS primary nominal current
0 +/-10V secondary voltage
Linearity error +/-15 ppm
>300 kHz bandwidth

Current Transducer 0 to 2000A RMS

Current transducer DL2000ID

+/-3000A DC / 2000A RMS primary nominal current
0 +/-2000 mA secondary current
Linearity error +/-1 ppm
>300 kHz bandwidth

Current Transducer 0 to 2000A RMS DC

Current transducer DL2000UB-10V

+/-2000A DC / 1414A RMS primary nominal current
0 +/-10V secondary voltage
Linearity error +/-20 ppm
>300 kHz bandwidth

What is a Zero Flux Transducer?

A zero flux transducer uses the flux gate principle. The current to be measured generates a magnetic flux that is counteracted by the flux generated by a secondary winding.

In general terms, the flux gate principle is to use an excited magnetic material coil as a probe. Thanks to a saturation/desaturation cycle and signal processing, this coil is able to measure the magnetic field proportionally. From that multiple options are possible to design a current transducer. It can simply replace a Hall effect probe in the air gap or the coil could have the shape of a tore.

The magnetic field in the toroid generated by the primary current (Ip) is counteracted by the compensating secondary current (Is) generated by the integrator.

The flux gate detects magnetic fields in the toroid from DC to less than 100 Hz at sub ppm levels and tells the integrator to compensate them out.

At higher frequencies, the feedback winding (Nfb) detects magnetic fields in the toroid at ppm levels and tells the integrator to compensate them out as well. The secondary current (Is) is therefore proportional to the primary current (Ip) with the ratio Np:Ns.

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