The Yokogawa SEA4D-01, also cataloged as the SEA4D-01 Safety Interface Terminal Board, operates as a dedicated hardware component for high-integrity signal transition and diagnostic isolation within ProSafe-RS Safety Instrumented System networks. The rack-mounted termination sub-assembly conditions and routes 16 analog channels natively at the hardware tier to link field instrumentation directly with safety-critical control logic.
Hardware Specifications
Parameter
Specification
Model
SEA4D-01
Brand
Yokogawa
Series
ProSafe-RS Safety Instrumented System (SIS)
Origin
Japan
Weight
1.5 kg net hardware component mass
Dimensions
124 mm x 120 mm x 25 mm (Width x Height x Depth)
Mounting Profile
19-inch industrial rack mountable form factor
Channel Density
16 analog channels (32 points, dual-point interface matrix)
500 V AC continuous galvanic test threshold for 1 minute
Insulation Resistance
> 100 MΩ when verified at 500 V DC
Product Type
Safety Interface Boards
High-Reliability Safety Control (SIS)
SIL3 Certification and Triple Modular Redundancy Compatibility The terminal board is manufactured to meet strict SIL3 certification constraints when deployed within certified ProSafe-RS safety loop architectures. The dual-point 32-pin termination array maintains strict path separation across its circuitry, allowing it to feed clean analog sensor telemetry directly into emergency shutdown (ESD) or fire and gas (F&G) voting logic without introducing cross-channel signal degradation.
Galvanic Isolation and Fail-Safe State Execution The board's electrical layout provides high dielectric isolation, tolerating up to 500 V AC to block field-side transient surges, lightning strikes, and ground loop current spikes from traveling backward into the internal processing layers. This high-isolation boundary preserves the operation of connected safety logic modules, ensuring reliable fail-safe state execution during critical plant trips.
