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ATH Current Transducer, ATHiso 4-20mA Current Loop isolator

Supplied with Din Rail mounting kit

4-20mA → 4-20mA
4-20mA → 4-12-20mA
4-12-20mA → 4-20mA
4-20mA → 0-10V
0-10V → 4-20mA
0-10V → 0-10V

Product Specifications

  • Available input ranges 4-20mA / 4-12-20mA with optional rescaling and voltage input
  • Outputs: 4-12-20mA or 4-20mA, optional 0-10V output.  Unipolar or bipolar configurations
  • Output Types - 0-1mA, 0-20mA, 4-20mA, 0-10V plus others
  • Auxiliary power input 5V/9-36V/48/110/230Vdc 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
  • 1.5kV isolation
  • Isolation 2kV to IEC414
  • True RMS Voltage Transducer
  • 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
  • Ideal with "chopped" or switching inputs
  • Screw terminal input/output connections IP30
  • Din Rail and fixing holes
  • Enclosure - 55mm wide low profile
  • Mounting - DIN Rail
  • Conforms to EMCDirective 89/336/EEC amended by 93/68/EEC and Low Voltage Directive 72/23/EEC
  • UKCA, CE Marked
  • UL94V0, IEC1010 cat II, IEC348, DIN 57411
  • Case IP50, terminals IP30 complies with IEC529
  • 2 year warranty


The ATHiso current loop isolator converts 4-20mA or 4-12-20mA to an isolated voltage or 20mA current loop output. The ATHiso current loop isolator isolates its input from output eliminating ground loops, common mode voltage errors, signal noise and resultant accuracy errors. Available ATHiso current loop isolator models cover signals used in process control like 4-20mA, 4-12-20mA and 0-10V where any combination can be input or output, operating with fast response capability.

The current loop isolator power input is designed to operate over a wide range associated with process control, telecomm and sub-station auxiliary dc supply systems. Some typical applications are current monitoring in automotive, traction, energy metering, industrial control, ac/dc drives, process control, rail transportation and ac motor driven devices like pumps. For all products, a USA NIST, UK UKAS traceable calibration certificate and certificate of conformance are available.

Current Transducer order codes
ATHiso / input / output / power input

Order code examples:

ATHiso / 4-20 / 4-20 / 24Vdc
4-20mA input, 4-20mA output with 24V aux power input

Order code examples:

ATHiso / 4-20 / 10 / 24Vdc
4-20mA input, 0-10V output with 24V aux power input

Order code examples:

ATHiso / 4-20 / 4-12-20 / 24Vdc
4-20mA input, 4-12-20mA output with 24V aux power input

Order code examples:

ATHiso / 10 / 4-20 / 24Vdc
0-10V input, 4-20mA output with 24V aux power input

Order code rescale examples:

ATHiso / 4-20 / 0.5 / 4-20 / 24Vdc
4-20mA input gives 4-12mA output (divide by 2) with 24V aux power input