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LOOP POWERED ISOLATOR ---------------------------------------------------------------------------LP1SI
  • 4~20 mA in, 4~20 mA out
  • Isolation between input and output :
         1.5 KV AC RMS / 1 minute,
         250 V AC RMS continuous
  • 0.1% transfer accuracy
  • 3.7 V loop drop
  • 25~425 Ω load
  • DIN rail mounting
  • No power supply required
  • ON LED shows state
    LP1SI is a loop powered isolator suitable for a variety of applications. It can be used, for example, to isolate the 4~20mA current signal from a 2-wire thermocouple transmitter or temperature controller, and pass it on to a PLC or datalogger. LP1SI eliminates earth and ground loop problems and simplifies interfacing.
    SPECIFICATIONS            All specifications at ambient of 25 °C, unless specified otherwise.
    Input current 4~20 mA DC
    Voltage drop across <3.7 V DC with zero ohms load
    input terminals on output
    Reverse polarity Provided for current inputs
    Maximum input current 50 mA
    Over current protection 100 mA fuse on PCB
    Nominal current transfer 1:1 in the range of 4~20 mA
    Permissible load 25~425 ohms
    Load trim 20-turn front panel potentiometer to trim output current for specified accuracy
    Linearity & calibration ±0.1% of span
    (I out = I in ± 16 μA)
    Temperature coefficient 0.01% of span per °C
    of accuracy  
    Input / Output isolation a) 1.5 KV AC RMS, 1 minute
    b) 250 V AC RMS, continuous
    Material ABS plastic
    Dimensions 80(H) x 25(W) x 85(D) mm
    Mounting snap on for 35 mm DIN rail to DIN 46277
    Connection, single / ≤ 2.5 mm2, AWG 14
    stranded wires  
    Weight <200 grams
    Protection IP 20
    Ambient, storage -20 to + 85 °C
    Ambient, operation -20 to +70 °C
    Relative humidity 0~95%

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