Product Description

The SAI143-S33 is a safety-certified analog input module designed for the Yokogawa ProSafe-RS Safety Instrumented System (SIS). It provides 16 fully isolated 4–20 mA channels, delivering high-integrity data for Emergency Shutdown (ESD) and Fire & Gas (F&G) safety applications. The "S33" variant is optimized for standard analog signaling without HART communication, while offering robust G3-rated corrosion protection and extended thermal tolerance for harsh industrial environments.

Key Features

• SIL 3 Certified: Ensures fail-safe operation in safety-critical loops with advanced internal diagnostics

• G3 Corrosion Protection: ISA Standard G3 conformal coating protects against harsh industrial gases

• Extended Temperature Range: Reliable operation from -20°C to +70°C

• Full Channel Isolation: Prevents ground loops and protects the SIS backplane from electrical surges

• Redundancy Compatible: Supports dual-redundant configurations to maintain continuous safety function

Technical Specifications

Industrial Applications

The SAI143-S33 is ideal for safety-critical monitoring in:

• Offshore oil and gas platforms

• Petrochemical and chemical plants

• Heavy industrial manufacturing

It monitors pressure, level, and temperature sensors in SIL-rated loops, ensuring reliable safety operation even in harsh, corrosive, or high-temperature environments.

Technical FAQ

Q: How does SAI143-S33 differ from SAI143-H33?
A: The S33 is standard analog and does not include HART digital communication. The H33 variant has a built-in HART modem to interface with smart transmitters for diagnostics and configuration.

Q: Can the module be used in a redundant configuration?
A: Yes, two SAI143-S33 modules can be paired for dual-redundant operation, maintaining the safety loop even if one module is offline for replacement or maintenance.