Product Description

The SAI143-H33 is a safety-certified analog input module designed exclusively for the Yokogawa ProSafe-RS Safety Instrumented System (SIS). Engineered for SIL 3 safety loops, this module provides 16 fully isolated 4–20 mA channels, delivering reliable data for Emergency Shutdown (ESD) and Fire & Gas (F&G) systems. The H33 variant integrates HART digital communication, G3-rated conformal coating, and an extended operating temperature range, ensuring durability and performance in harsh industrial environments.

Key Features

• SIL 3 Safety Certified: Meets rigorous standards for safety-critical process control

• HART Digital Communication: Enables simultaneous analog signal and digital diagnostics for remote monitoring

• G3 & High-Temperature Protection: Corrosion-resistant coating and reliable operation from -20°C to +70°C

• Full Channel Isolation: Prevents ground loops and contains field-side faults to individual channels

• Redundancy Ready: Compatible with dual-redundant SIS configurations to maintain uninterrupted safety operations

Technical Specifications

Industrial Applications

The SAI143-H33 is ideal for safety-critical monitoring in:

• Offshore oil platforms

• LNG terminals

• Chemical and petrochemical refineries

• High-corrosion and high-temperature industrial environments

It monitors critical sensors such as pressure, level, and temperature in SIL-rated loops, ensuring the highest safety and reliability standards.

Technical FAQ

Q: Why use SAI143-H33 instead of a standard AAI143?
A: The SAI143-H33 is safety-certified with built-in diagnostics and hardware designed to fail safely, meeting SIL 3 requirements. The AAI143 is for standard process control and does not provide these safety guarantees.

Q: What does the “H33” suffix indicate?
A: The first '3' represents the temperature-hardened version (-20°C to 70°C), and the second '3' signifies the G3 conformal coating for protection against corrosive gases.