2. Core Product Function

1. Per-channel independent galvanic isolation

   Isolation circuit completely separates DCS internal control circuit and field instrument loops, eliminates ground potential difference drift, suppresses inverter EMI, static electricity and lightning surge interference, ensures stable measuring precision for long cable signal transmission.

2. Multi-stage signal filtering + surge protection

   Each channel integrates RC low-pass filter and TVS transient voltage suppression components, filters high-frequency industrial noise and clamps abnormal overvoltage to protect upstream AI IOP main card.

3. Reinforced anti-vibration screw terminal (core feature of -225)

   Thickened metal screw base, double locking structure, suitable for equipment rooms with strong vibration such as compressor rooms, pump houses, turbine auxiliary cabinets; effectively prevent wiring loosening under long-term mechanical vibration. Compatible with 14~22AWG shielded instrument cables.

4. Partial conformal coating

   Key signal circuit area coated with moisture-proof anti-corrosion paint, better anti-humidity performance than non-coated -125 version, suitable for workshop cabinets with slight steam, volatile trace corrosive gas.

5. Loop fault diagnosis linkage

   Cooperates with MU-PAI02 IOP to detect transmitter loop open circuit, short circuit, signal over-range, fault alarms uploaded to UCN bus and displayed on operator station.

6. Non-redundant standard layout

   For conventional measurement loops; select redundant isolated FTA variants for high-reliability safety interlock measurement points.

3. Electrical & Mechanical Specifications

1. Channel count: 8 independent galvanically isolated analog input channels

2. Supported signal: Standard 4–20mA DC two-wire / four-wire transmitters

3. Isolation withstand voltage: 1500 VAC between each channel and backplane bus

4. Transmission linearity accuracy: ≤ ±0.05% full scale

5. Terminal: Heavy-duty reinforced anti-vibration screw terminal

6. PCB coating: Partial conformal coating only on analog signal circuits

7. Operating temperature range: -40℃ ~ +70℃

8. Per-channel protection: Self-recovery short-circuit protection, ESD & surge suppression

9. Power supply: 24VDC from HPM/APM rack backplane

10. Max full-load power consumption: 0.95W

11. Hot swap: Support online replacement without cabinet power-off

4. Industrial Application Scenarios

1. Petrochemical & Chemical Plants

   Reactor, compression unit flow/pressure/level transmitter signal collection; adapt to strong vibration compressor auxiliary cabinets, medium humidity workshop environment.

2. Thermal Power Generation

   Boiler feed pump, induced draft fan, turbine auxiliary cabinet analog signal isolation; solve signal jitter caused by long-term equipment vibration.

3. Oil & Gas Station

   Pipeline compressor station, on-site pump house instrument signal wiring, prevent terminal loosening under continuous mechanical vibration.

4. General Process Industry

   Chemical raw material processing, pulp and paper workshop control cabinets with vibration and slight moisture.

5. Model Selection Suggestion

• Pick 51304640-225: Severe vibration cabinet, medium humidity, require reliable screw wiring without frequent overhaul disassembly.

• Pick 125: Static clean central control room, low cost demand.

• Pick 175: Mild vibration, general humidity workshop, ordinary CC anti-vibration terminal.

• Pick 325/375: Need fast spring crimp wiring during large-scale overhaul; 375 for coastal salt fog heavy corrosion environment.