MJK Isolation Amplifiers
Isolation Amplifiers
Water , Signal Processing


  • MJK Isolation Amplifiers used for galvanic separation of measuring circuits and power supply to 2-wire and 3-wire transmitters, thus saving a separate power supply.
  • Product series include isolation amplifier for field mounting and isolation amplifier panel mounting.
Part Number 200135 200136 209140
Mounting Local Local Local
Supply 15 - 35 V DC 15 - 35 V DC 15 - 35 V DC
Load 120 mA 120 mA -
Output signal   3-wire 4-20 mA, 2- or 3-wire, max. 500 Ω  
Input signal   4-20 mA, 2-wire or 3-wire  
External supply   15 V DC, 80 mA max  
Air filter No Yes -
Temperature range   -5 … +140 °F  
Material Makrolon Makrolon Lexan/Nory
Enclosure NEMA 4X NEMA 4X NEMA 1
CE approvals   EN50081-1, EN50082-1  


Iso-Power is supplied in two versions; Panel for DIN rail mounting and Field for local mounting. Additionally, the Field version can be equipped with a display for local indication. On both versions it is possible to adjust both zero / span and also the damping of the output signal. Iso-Power isolation amplifiers are used for galvanic separation of electrical measuring systems, and supplies the measuring circuit loop power at the same time, thus saving a separate power supply. Iso-Power isolation amplifiers can be used to:

  • Avoid short circuit between measuring circuits.
  • Eliminate coupling of potentials from liquids, amplifiers and PLC’s, which can cause disturbances on analytic measurements for pH, redox and conductivity.
  • Ease fault finding because a galvanic isolation will isolate the wiring problems.
  • Reduce or eliminate damages caused by overvoltage limiting instrument damage.
  • Reduce interference caused by electric noise. Iso-Power has adjustable damping of the output signal.


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