Technical Specifications:

• Model: FX1004-4-3-H
• Series: FX1000
• Number of Input Channels: 4 universal inputs (4)
• Number of Output Channels: 3 isolated outputs (3)
• Mounting Orientation: Horizontal (H)
• Input Types: Type K, J, T, E, R, S, B thermocouples; Pt100, Pt1000, Cu50, Cu100 RTDs; 0–100 mV, 0–5 V, 1–5 V, 0–20 mA, 4–20 mA
• Output Types: 4–20 mA DC (3 channels, galvanically isolated)
• Isolation: 500 V AC between input and output, 250 V AC between outputs
• Power Supply: 24 V DC (operating range: 18–36 V DC) or 100–240 V AC
• Accuracy: ±0.2% of span (input), ±0.1% of span (output)
• Response Time: ≤ 0.5 seconds
• Operating Temperature: -10 °C to +55 °C
• Protection Class: IP20 (indoor use)
• Dimensions: 120 × 60 × 90 mm (W × H × D) for horizontal mounting
• Weight: Approximately 0.4 kg

Functional Features:

• Input-to-output signal conversion (e.g., TC input → 4–20 mA output)
• Input-to-output signal retransmission with galvanic isolation
• Linearization for thermocouple and RTD inputs
• Cold junction compensation (CJC) for thermocouple inputs (built-in)
• Programmable input range and output range via DIP switches or PC software
• LED status indicators for each channel (power, input, output, fault)

Performance Parameters:

• Input Impedance: 10 MΩ (voltage input), 100 Ω (current input)
• Output Load: 0–600 Ω (4–20 mA output)
• Isolation Voltage: 500 V AC (1 minute, input to output)
• Dielectric Strength: 1,500 V AC (1 minute, input to chassis)
• Common Mode Rejection Ratio (CMRR): ≥ 120 dB
• Power Consumption: ≤ 5 W (24 V DC supply)

Material Composition:

• Housing: Flame-retardant polycarbonate (UL94 V-0)
• Terminal Block: Phoenix-type, nickel-plated brass screws
• PCB: FR-4 glass epoxy, conformally coated
• Internal Shielding: Copper foil EMI shielding between input and output sections

Structural Features:

• DIN rail mounting (35 mm top-hat rail) — horizontal orientation
• Screw-terminal wiring from the front (removable cover)
• 4 input terminal blocks and 3 output terminal blocks, clearly labeled
• LED indicators on the front face for each channel
• Compact form factor suitable for control cabinet installation

Working Principle:
The FX1004 receives process signals on its 4 universal input channels. Each input is conditioned by dedicated signal conditioning circuitry (amplification, filtering, cold junction compensation for TC, linearization for RTD). The conditioned signal is then converted by a high-resolution A/D converter. The digital value is processed by the internal microprocessor and converted back to an analog signal by a precision D/A converter. The analog output is galvanically isolated from the input via an isolation transformer or opto-isolator and delivered as a 4–20 mA signal on one of the 3 output channels. Each output channel is independently isolated from the others.

Advantages & Highlights:

• Galvanic isolation (500 V AC) eliminates ground loops and noise interference
• 4 inputs to 3 outputs provides flexible signal routing and distribution
• Built-in cold junction compensation eliminates the need for external CJC modules
• DIP switch configurable — no software required for basic setup
• Horizontal DIN rail mounting (H) saves vertical space in crowded control cabinets

Applicable Industries:

• Process Control Systems (DCS/PLC I/O isolation)
• Building Automation (HVAC signal distribution)
• Industrial Automation (signal conditioning for analog I/O)
• Power Generation (turbine and generator monitoring)
• Water and Wastewater (pump and valve control)
• Food and Beverage (sanitary signal isolation)

Installation Requirements:

• Mount on 35 mm DIN rail in a horizontal orientation
• Provide 24 V DC power supply (18–36 V DC) or 100–240 V AC
• Use shielded twisted-pair cables for TC/RTD inputs; ground shield at the FX1004 end
• Maintain minimum 20 mm separation between the FX1004 and high-power devices (VFDs, contactors)
• Configure DIP switches according to the desired input/output range before connecting signals

Usage Precautions:

• Do not exceed the maximum isolation voltage of 500 V AC between input and output — this will destroy the isolation barrier
• Verify input signal range matches the DIP switch setting before applying signals
• Do not short-circuit the 4–20 mA output terminals
• Ensure the power supply voltage is within the 18–36 V DC range (for 24 V DC operation)
• Do not install in locations with ambient temperature exceeding +55 °C
• Tighten all terminal screws to 0.5 N·m torque to ensure reliable contact
• Perform zero and span calibration annually using a precision calibrator