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INSTALINK-GLF Ground Loop Filter

Brand: Emphatec
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It acts like a current loop isolator up to a point but doesn’t use a transformer or optocoupler for isolation! Maybe we could call it a “non-galvanic isolator” but we can’t think of any other type of isolation other than galvanic. Since it tolerates ground differential voltages up to 120 V we even considered naming it “The Tolerator” but to avoid controversy we opted for “Ground Loop Filter” or “GLF” for short. 

This module interfaces a field transmitter producing 4-20 mA to a PLC or DCS input. Where Analog isolators can provide optical or transformer isolation up to 2 kV or higher the InstaLink-GLF provides a very high impedance between the input and output loops but does not actually isolate the signals. This acts as a barrier for currents caused by ground differentials. 

The barrier is rated 120 V - above 140 V it can break down and a ground loop current would be produced. 120 volts represents a sizeable ground differential voltage and much lower values are typical.
Features
  • Eliminates ground loops caused by differential ground voltages up to 120 V

  •  Make-before-break test jack for temporary connection of a meter

  •  2-Wire input, 3-Wire output

  •  Fast response time

  •  Plug-in jumpers for 24 Vdc supply reduces installation time (jumpers included)

  •  Mounts on 32 mm and 35 mm DIN rails

    • Specifications

    Brand

    Accuracy

    • 0.08 % Typical at 25° C (77° F)
    • 2 % Absolute Worst Case (120 V Ground Differential over Complete Temperature Range)

    Approvals & Certifications

    • UL (C,US) E236770

    Consumption

    • Output Current +10 mA Typical

    Electrical Connectors

    • Input: 26 to 12 AWG
    • Jumpers: 16 to 14 AWG
    • Output: 28 to 14 AWG

    Input

    • 4-20 mA

    Mounting

    • 32 mm or 35 mm DIN Rail

    Output

    • 4-20 mA

    Resistance

    • Impedance: 250 ohms
    • Output Loop Impedance: 0 to 1 Kiloohm at 24 Vdc Supply
    • Output Loop Impedance: 0 to 500 ohms at 12 Vdc Supply

    Response Time

    • 2.5 milliseconds

    Storage Temperature

    • -20° to 70° C (-4° to 158° F)

    Supply Voltage

    • Supply Range: 12-28 Vdc Depending on Output Loop Impedance

    Voltage

    • Input-Output Ground Differential Voltage: 120 V Rated
    • Input-Output Ground Differential Voltage: 140 V Absolute, Max.

    Documentation

    Data Sheets

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