Product Overview

The Yokogawa SAI143-S33 is a high-precision, 16-channel analog input module specifically designed for the ProSafe-RS Safety Instrumented System (SIS). This module provides accurate 4 to 20 mA signal acquisition for critical safety loops, including Emergency Shutdown (ESD) and Fire and Gas (F&G) systems. It is engineered to interface with both 2-wire and 4-wire transmitters, offering integrated transmitter power supply management with individual channel current limiting.

Built to meet the stringent requirements of SIL3 safety standards, the SAI143-S33 ensures maximum process uptime through advanced internal diagnostics and robust galvanic isolation. Its ability to provide stable measurements in high-interference industrial environments makes it a foundational component for safety-critical monitoring in offshore platforms, refineries, and chemical processing facilities.

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: SAI143-S33

• Module Type: Analog Input Module (Safety Type)

• Number of Channels: 16, isolated

• Input Signal Range: 4 to 20 mA DC (Supports 0 to 25 mA permissible range)

• Measurement Accuracy: ±16 µA (within 1 to 23 mA range)

• Data Refresh Cycle: 40 ms

• Transmitter Power Supply: 16.15 V to 26.4 V DC

• Withstand Voltage: 1.5 kV AC between input signals and system logic

• Temperature Drift: ±16 µA per 10°C

• Operating Temperature: -20°C to +70°C

• Weight: 0.3 kg (Net) / approx. 0.39 kg with terminal block

• Dimensions: 3.3 cm x 10.7 cm x 13 cm

• Origin: Japan

Key Technical Characteristics

• Safety Instrumented System Integration: Specifically optimized for ProSafe-RS, supporting hardware redundancy and comprehensive self-diagnostics to detect field-side faults and internal module failures.

• Flexible Transmitter Powering: Each channel can be configured to provide power to 2-wire transmitters or receive signals from externally powered 4-wire devices, with integrated current limiting at 25 mA per channel.

• Remote Reset Functionality: Features an integrated transmitter power ON/OFF control, which is essential for remotely resetting smoke and gas detectors in Fire and Gas safety systems.

• High-Level Dielectric Protection: Employs 1.5 kV AC galvanic isolation to shield the safety controller's backplane from electromagnetic interference (EMI) and electrical transients originating in the field.

• Rapid Safety Response: Maintains a consistent 40 ms data update rate, ensuring that the safety logic solver receives real-time data for high-speed shutdown sequences.

• Diverse Connection Support: Compatible with multiple termination styles, including pressure-clamp terminal blocks for direct wiring or MIL connector cables for high-density cabinet integration.