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ATH Current Transducer for Current Sensing

Supplied with Din Rail mounting kit

Product Specifications

  • Available input ranges 100mA / 200mA / 1A / 2A / 5A / 10A rms ac or dc.  Operational from 10% - 125% of range
  • Outputs: 50mV, 100mV, 1V, 5V, 10V, 4-12-20mA or 4-20mA (4-20mA dc amps input only or ATHR models).  Unipolar or bipolar configuration
  • Auxiliary power input 5V/9-36V/48/110/230 Vdc or Vac.  Max current draw 24Vdc 50mA max
  • Fast response time <200uS (no filtering).  Standard frequency range is DC-10kHz
  • Certified accuracy better than <1.0% at +23°C ±5°C, traceable to NIST/NPL (5 minute warm up)
  • Internal gain calibration controls
  • Based on isolation amplifier for 1.5kV
  • Working temperature range 0°C - 50°C
  • Functional temp range –10°C -70°C
  • Rated working voltage insulation 1.5kVpk, flash tested 2.5kV for 1 minute
  • Screw terminal input/output connections IP30
  • 3.5 mm fixing holes
  • CE Marked
  • UL94V0, IEC1010 cat II, IEC348, DIN 57411
  • Case IP50, terminals IP30 complies with IEC529
  • 1 year warranty


The ATH current transducer range converts dc or ac current to an isolated voltage or current loop output.   The ATH sensors are direct connecting, meaning they connect in the circuit under test eliminating CT limitations and errors.  The available ATH models cover the range from 0-100mA to 0-5Arms, operating with fast response capability.  ATH are instantaneous conversion, the ATHR are rms converting where the ATHR device will give true rms conversion even with distorted waveforms, over DC-10kHz range.

The sensor power input is designed to operate over a wide range associated with process control and sub-station auxiliary dc supply systems.  Some typical applications are current monitoring in energy metering, industrial control, ac/dc drives, process control, rail transportation and circuit breaker trip coils.  For all products, a USA NIST, UK NPL traceable calibration certificate and certificate of conformance are available.   ATH and ATHR sensors are available in ac only or dc + ac configurations.

Safety and good working practice when using the ATH current transducer

  1. Ensure that all personnel connecting and configuring the ATH are fully trained and conversant with electric shock and fire hazards associated with electricity supplies
  2. Ensure the circuit under test is switched off and isolated before connection
  3. Only use safety type cables for connections to the ATH probe.  These cables are typically fitted with a 4mm safety type banana connector on either end.  All connections should be insulated to prevent human contact
  4. Ensure that the ATH output (lo terminal) is connected to a grounded point on the scope/data logger/measurement system.  Ensure it is a true ground and not just signal low
  5. Ensure that the maximum input to output isolation is not exceeded
  6. Users should always work in pairs, both parties should be trained and familiar with medical procedures in the event of electric shock
  7. Ensure the circuit test is protected with over current protection
  8. During installation, avoid all mechanical stress to the ATH probe terminals
  9. Do not use the ATH current sensor with the case open
  10. Ensure that the storage and operating conditions are clean and dry, do not use where there is risk of explosion

Current Transducer order codes

ATH / current range / freq / output / power input

Order code examples:

ATH / 5A / dc / 4-20 / 24Vdc
5Adc input, 4-20mA output with 24V aux power input
Calibrated 0-5Adc

ATH / 1A / ac + dc / 10 / 24Vdc
1Adc input, 0-10V output with 24V aux power input

Calibrated 0-1Adc

Order code examples (rms converting):

ATHR / 1A / ac+dc / 4-20 / 24Vdc

1Aac or dc input, 4-20mA output with 24V aux power input

Calibrated 0-1Arms

ATHR / 1A / ac / 4-20 / 24Vdc
1Aac input, 4-20mA output with 24V aux power input

Calibrated 0-1Arms (ac only)