Current Sensors and Transducers
High-accuracy Current Measurement

Iron-Core Current Transformers

The iron-core current clamp works on the principle of a transformer. Depending on the number of windings on the primary side compared to the secondary side (turns ratio), a certain current will be induced on the secondary side. Like any transformer, this only works for measuring AC current.

The DS-CLAMP-xxAC offers measurement ranges from 5 ACRMS up to 1000 ACRMS, with a bandwidth up to 10kHz. Measurement accuracy is from 0,3% to 3,5% depending on the measurement range.

Iron core clamps offer operating temperatures from -40°C to +70°C, and the ability to measure coil diameters from 50 mm up to 52 mm depending on the model.

Fluxgate Current Clamps

Fluxgate current sensors make use of a high permeability magnetic core in order to ascertain the magnetic field that is produced as the current flows through a conductor. Fluxgate technology depends on a negative feedback circuit, including a magnetic circuit. This is done by reverting a current back through the feedback coil so that the magnetic flux can be canceled out. The magnetic flux is caused in the coil by the current that is measured. This decreases the effect of the material’s magnetic nonlinearity, as it is compensated and can be kept low.

The DS-CLAMP-xxDC offers measurement ranges up to 1000 A DC and ACrms, with a bandwidth up to 500 kHz depending on the model.

They offer excellent accuracy of 0,3% depending on the measurement range. Operating temperatures from -40°C to 85°C, and the ability to measure coil diameters of up to 50 mm depending on the model.

These current transducers require a separate PWR-MCTS2 power supply unit. See bellow for PRW-MCTS2.

Current Shunt
DSI Current Adapters

While some amplifiers offer direct measurements of small range current inputs. Dewesoft offers external shunt adapters for direct current measurement. The DSI adapters are compatible with all Dewesoft data acquisition systems that have DSUB9 input connectors. The following DSI shunt current adapters are available:

• DSI-20mA - 20 mA current input adapter with 50 Ohm internal shunt, 0.05% accuracy for sensors with 4 to 20 mA output.
• DSIw-20mA - Waterproof version of the DSI-20mA adapter. It uses a 50 Ω shunt resistor with 0.01 % accuracy and 0.2 ppm/K temperature drift (0.05 ppm/K in the temperature range 0 °C to 60 °C). It is designed for sensing current from industrial sensors with 4-20 mA output in harsh environments. It is designed with a double DSUB9 adapter hood with IP67 protection.
• DSI-5A - The new 5A current input adapter. Contains a 10 mΩ shunt resistor with 0.1% accuracy when calibrated. The new DSI-5A adapter has significant improvement is in temperature stability. The new shunt resistor has two times better temperature coefficient (now 15 ppm/K over the range -55 °C to +125 °C, before 30 ppm/K over the range -20 °C to +60 °C).
• DSIi-10A - isolated current transducer with 10 A FS and < 0.5% accuracy with banana connector inputs.
• DSIi-20A - isolated current transducer with 20 A FS and < 0.5% accuracy with banana connector inputs.

Please note that isolated voltage input amplifiers are required for connecting shunt resistor adapters.

SIRIUS XHS-PWR
E-mobility Device With Integrated DC-CT Current Transducer

The SIRIUS XHS-PWR is a power measurement device designed for direct in-vehicle measurement of current, voltage, and power. It features an integrated and patented DC-CT current transducer for very precise current measurements in the most demanding applications such as high current peaks as well as leakage current measurement.

The current transducer uses special patented DC-CT technology based on the Platiše flux sensor. It represents the latest current sensing technology with ranges 100A, 500A, and 1000A, a wide 1 MHz bandwidth, and ultimate performance. Excellent linearity, precision, accuracy, immunity to external magnetic fields, low offsets, extremely low-temperature drift are achieved at low power operation.

The device can also directly measure the voltage up to 2000V peak (CAT II 1000V) with up to 5 MHz bandwidth.

The device is extremely compact and perfect for direct installation into a vehicle with the power lines leading through the device. It has an IP65 degree of environmental protection which allows the usage in harsh environments and during rough drives.

Learn more

• Integrated Power Measurement Solution With Patented High-Performance AC/DC Current Transducer
• New DC-CT current transducer technology explained