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    Signal Isolator, Multi-Input (TC/RTD), MODBUS-RTU Output

    SKU: SUCH-SIGNI-402E
    $101.07
    ● TC/RTD input to RS485 output ● Transmission distance 1000m, up to 32 nodes ● Accuracy ±0.1% F.S., 0.1% F.S./°C drift ● Supported inputs RTD/TC/potentiometer/resistance
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    🚚 Free shipping
    🕒 Delivery date: 6-12 days
    🔁 30-day Returns
    Overview

    This analog isolator accepts thermocouple, RTD, resistor, or potentiometer inputs. It outputs 0‑20mA or 0‑10V with load ≤400Ω or load ≥10kΩ. Channel options: 1‑in‑1‑out, 1‑in‑2‑out, 2‑in‑2‑out. Accuracy ±0.1% or ±0.2% F.S. with ≤1s response and ±0.1% F.S./°C drift. Analog signal isolator, it offers MODBUS‑RTU communication (≤32 nodes, 1000m), 1500VAC isolation, and ≥100MΩ insulation. This thermocouple rtd signal conditioner and temperature input signal isolator operates on DC 18‑32V, complies with IEC 61326‑1, and mounts on 35mm DIN rail (106.5×12.5×115mm). This signal conditioner 4‑20mA is ideal for multi‑sensor temperature signal conditioning.

    Feature

    • Digital output: direct MODBUS-RTU from TC/RTD input skips analog conversion for zero accuracy loss and lower system cost.
    • RS485 communication: up to 1000 m with ≤32 nodes enables distributed monitoring without signal degradation over long runs.
    • Accuracy & drift: ±0.1% FS accuracy and ±0.1% FS/°C drift ensure stable digital readings across -20~55°C without recalibration.
    • Multi-input: supports RTD, resistor, potentiometer, and TC in one device, reducing spare parts inventory.
    • Channel config: flexible 1in1out, 1in2out, or 2in2out matches signal distribution needs and minimizes module count.
    • Isolation strength: 1500V AC/1min with ≥100 MΩ insulation protects RS485 networks from surges and ground loops.

     

    Dimension (Unit: mm)

    Dimensional drawing of ultra-slim signal isolator (Unit: mm)

     

     

    Wiring Diagram

     Wiring diagram for 1-channel RTD signal isolator with dual 4-20mA outputs
    Spec
    Input Signal (Sensor type) B
    E
    J
    K
    N
    R
    S
    T
    Cu50
    Cu100
    Pt100
    Pt1000
    Pt500
    Ni100
    Ni1000
    Ni500
    R3
    R5
    Output Signal 0-20mA
    0-10V
    Number of Input & Output Channels 1 input channel & 1 output channel
    1 input channel & 2 output channel
    2 input channel & 2 output channel
    Basic Accuracy (selectable model-dependent) ±0.1% F.S or ±0.2% F.S (at 20°C) – basic accuracy does not include cold junction compensation error
    Output Load Resistance For current output (0-20mA): RL ≤ 400Ω
    For voltage output (0-10V): RL ≥ 10kΩ
    Communication Output Protocol (optional feature) MODBUS-RTU (if communication is required)
    Communication Distance (if communication is used) Number of nodes ≤ 32, distance ≤ 1000m
    Response Time ≤1 s (0-90%) (TYP)
    Temperature Drift ±0.1% F.S / °C (-20°C ~ +55°C)
    Insulation Strength 1500 V AC / 1 min (between input, output and power supply)
    Insulation Resistance ≥100 MΩ (between input, output and power supply)
    Power Supply Voltage DC 24 V (fixed)
    Voltage Range (Supply) DC 18-32 V (acceptable range)
    Operating Temperature Range -20°C ~ +55°C (no condensation, no icing)
    Electromagnetic Compatibility IEC 61326-1
    Dimension 106.5 × 12.5 × 115 mm
    Installation 35 mm DIN rail
    Application
    Cold chain logistics temperature and humidity application view

    Cold Chain Logistics

    Laser cutter CNC position signal application environment

    Laser Cutter & CNC

    Metro depot track switching and interlocking site context

    Metro Depot

    FAQ

    A: This unit outputs MODBUS‑RTU digital signal directly – it's a signal conditioner with built‑in digital communication. Instead of just isolating and passing 4‑20mA, it converts TC/RTD/potentiometer inputs to RS485 digital data. You get digital accuracy, no analog signal degradation over long cable runs, and direct PLC/DCS integration without needing an extra analog input card.

    A: Supports thermal resistor (RTD), resistor, potentiometer, and thermocouple – all in one device. However, all channels share the same input type and range (configured at order). If you need different sensor types on different channels, you'll need separate units – or check with our team for custom options.

    A: The primary output is MODBUS‑RTU via RS485. It also provides an analog output (0‑20mA or 0‑10V) as a secondary signal. So yes – you get both: digital data for your PLC/DCS and an analog signal for a local display or backup controller. Best of both worlds.

    5.0 1
    Write your own review Close
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    Benjamin Cole | 8/20/2026 8:47 AM
    signal isolator multi input saved space in my cabinet
    I replaced several single-function isolators with this one for a small automation system. The signal isolator multi input is convenient because it handles multiple signal requirements in one device. Installation was straightforward, and the readings stayed consistent during operation. The first test took a little longer than expected, but the final result has been good.