NMTI 2 - current converter AC

NMTI 2 - Two-input transducer of rms values of electric current

A modern multipurpose quantity-to-current loop converter designed for installation in switchboards.

To order the devices as contact us at: mcu@metra.cz

NMTI 2 - Two-input transducer of rms values of electric current

The NMTI 2 is a two-input transducer with two independent analogous outputs. Both of the outputs are electrically isolated from the outputs, from the power circuits and from each other, so that one NMTI 2 transducer is able to replace two common current transducers. In this way a significant savings of installation space can be achieved.


  • powering voltage 20V to 260V DC or AC 50/60 Hz
  • power consumption 1.5W at fully loaded outputs
  • number of current measuring inputs 2
  • rated input current In selectable within 1A to 5A range
  • input current range 0 to 1.2 In
  • accuracy of current measurement 0.2 % In
  • input overload capacity, permanently 1.2 In

short-time 20 x In /one second

  • analogous outputs 2

- current type 0...20mA; 4...20 mA

or on order 0…x mA (x= 5 to 20 mA)

- voltage type 0...10 V

or on order 0…x V (x= 1 to 10 V)

There is a galvanic interconnection between the GNDA and GNDB ground terminals established internally in the transducer!

  • settling time after the connection of power supply 1 minute
  • operating temperature range -25 to +70°C
  • error caused by ambient temperature

no more than ±0,1%/10°C, as per the requirements of ČSN EN 606 88 standard, to apply for the temperature range of –25°C to +55°C (+ 0.2% of additive error caused by ambient temperature ranging from +55°C to +80°C)

  • permitted output load ranges

- voltage output Ru higher than Uan /8mA

- current output Ri loop resistance less than 10V/Ian

  • dielectric strength (as per ČSN EN 61010-1)

- inputs as against the outputs and power circuits 3700V; 50Hz/1min

- in between the inputs 1000 V; 50 Hz/1min

  • weight no more than 150g
  • dimensions 101x114x24 mm
  • working position arbitrary
  • protection degree IP 20
    • electromagnetic compatibility radiation: as per ČSN EN 55011-B
      • immunity: as per ČSN EN 6100-6-2 ed.3

Safety according to ČSN EN 61010 – 1 standard: equipment of class II, overvoltage category III after having become a part of the installation (highest voltage against the earth: 300Vrms), pollution degree 2