4-20mA Loop-Powered Isolators, 2-Wire

Models get power from the 4-20mA output or input loop (sinks or sources current). Typical uses are as a current repeater or to drive resistive loads. 651T and 250T models are ideal for applications that require an isolator with a power supply in series with the output signal. Power is obtained from the output loop. The isolator must control current draw from the power supply in the output loop which is the 4-20mA signal. Since output and power share the same two wires, this type of isolator can be placed anywhere between the field sensing device and the PLC/DCS or monitoring device. Usually, the isolator is located close to the field device. Since both the input and output signal are 4-20mA, location of the device is not critical. 670T and 270i models are useful when adding and isolating a monitoring instrument to an existing current loop. When adding a field device such as a recorder or display, no additional power source is required for the added loop or for the isolator. The isolator's output is powered by the input loop power and drives passive loads only.

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    250T-DC, 350T-DC, 450T-DC: Analog Transmitter; AC-, DC- or Loop-Powered, DIN Rail-Mount

    • DC voltage or DC current input
    • DC voltage or DC current output
    • Loop or DC or AC power
    • Excellent accuracy and stability ensure reliable measurements in harsh industrial environments. Input isolated from output/power
    $450$495
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    270i: Isolator; Input Loop Power

    • 4-20mA DC input
    • 4-20mA DC output
    • 12 to 50V DC @ 20mA (loop-powered)
    • 1500V AC peak isolation DC prevents ground loops
    The 270i accepts a process current input and provides an isolated 4 to 20mA process current output signal. Power is received from the input signal current.
    $495$710
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More 4-20mA Isolators Information

651T and 250T models are ideal for applications that require an isolator with a power supply in series with the output signal. Power is obtained from the output loop. The isolator must control current draw from the power supply in the output loop which is the 4-20mA signal. Since output and power share the same two wires, this type of isolator can be placed anywhere between the field sensing device and the PLC/DCS or monitoring device. Usually, the isolator is located close to the field device. Since both the input and output signal are 4-20mA, location of the device is not critical.

670T and 270i models are useful when adding and isolating a monitoring instrument to an existing current loop. When adding a field device such as a recorder or display, no additional power source is required for the added loop or for the isolator. The isolator's output is powered by the input loop power and drives passive loads only.

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