2. Product Function Description

1. Full Galvanic Isolation

   Complete electrical separation between DCS cabinet internal control circuit and field actuator loop, thoroughly eliminate ground loop potential difference drift, suppress EMI and ESD surge interference from long field cables.

2. 4–20mA Signal Transmission & Conversion

   Receives standard 4–20mA regulating signal output from AO FTA, isolates and reconstructs linear 4–20mA current signal to drive field pneumatic/electric valve positioners. Guarantees no signal attenuation and control precision within full scale.

3. Overvoltage & Overcurrent Protection

   Built-in self-recovery protection circuit; automatically limit output current and clamp surge voltage when field short-circuit or lightning surge occurs, avoid backflow damage to AO IOP main card.

4. Partial Conformal Coating (-175 exclusive feature)

   Key circuit area coated with anti-corrosion conformal paint, stronger resistance to high humidity, slight corrosive gas and dust than the standard -100 model, suitable for semi-harsh chemical, power auxiliary cabinet environments.

5. Compact Plug-and-Play Installation

   Lightweight modular design, directly wired to AO FTA screw terminals without extra rack space; supports online replacement without shutting down the control loop temporarily.

3. Core Electrical Technical Specifications

1. Signal Range: Input & Output 4–20mA DC analog current signal

2. Isolation Strength: 1500VAC channel-to-channel galvanic isolation

3. Linearity Accuracy: ≤ ±0.05% full scale

4. Max Load Capacity: 550Ω output load resistance, compatible with most industrial valve positioners

5. Protection Function: Short-circuit auto-recovery, TVS transient surge suppression, ESD protection

6. PCB Feature: Partial conformal coating on core signal circuits

7. Operating Ambient Temperature: -40℃ ~ +70℃ industrial wide temperature range

8. Mechanical Parameter: Net weight approx 300g, compact DIN rail optional mounting bracket

9. Certification: UL industrial safety certification

10. Power Consumption: Max 0.8W per isolator unit

4. Industrial Application Scenarios

1. Chemical & Petrochemical Industry

   Reactor, distillation column regulating valve AO loop isolation; solve ground loop signal drift caused by multi-unit different grounding potentials, adapt to high-humidity workshop cabinet environment via coated circuit.

2. Thermal Power Generation Industry

   Boiler feed water valve, steam turbine steam regulating actuator signal isolation, prevent lightning surge and high-frequency frequency converter interference from damaging DCS AO cards.

3. Oil & Gas Industry

   Pipeline pressure regulating valves, tank area liquid level control actuators signal conditioning, improve signal stability of long-distance field wiring.

4. General Process Control

   Water treatment, pharmaceutical plant analog output control loop anti-interference transformation, upgrade original unisolated AO circuits for stable closed-loop PID regulation.