YOKOGAWA SAI143H – Safety Analog Input Module with HART for ProSafe-RS

The YOKOGAWA SAI143H is a safety-rated analog input module designed for ProSafe-RS Safety Instrumented Systems. It’s typically used to bring 4–20 mA process signals from field transmitters into the SCS, while passing HART data back to your asset management tools. From my experience, the “H” suffix is the helpful part here—HART pass-through makes device diagnostics and configuration far simpler during commissioning and turnaround planning.

One thing I appreciate is how the SAI143H balances safety performance with practical I/O density. In many cases plants use it for pressure, level, and temperature transmitters where SIL-rated input handling and predictable diagnostics matter, but you still want to keep cabinets compact and wiring clear.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week when in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• Safety-grade AI for ProSafe-RS – Engineered for use in Safety Control Stations where SIL compliance is required.
• HART-enabled (“H” suffix) – Pass-through of HART data for device diagnostics, configuration, and loop checks.
• 4–20 mA transmitter inputs – Suited for standard 2-wire and 4-wire transmitters; external loop power typically used.
• Efficient channel density – High channel count per card helps reduce cabinet footprint and marshalling effort.
• Robust isolation – Field-to-system isolation helps protect the SCS; channel-to-channel isolation is typically not provided on this series.
• Backplane integration – Communicates over the Yokogawa I/O backplane to the SCS; no external comms module required for AI.
• Diagnostics support – Status, range error detection, and HART-based diagnostics streamline maintenance activities.

Technical Specifications

“We swapped a legacy AI card with the SAI143H during a hot cutover—HART diagnostics picked up two miswired loops immediately. Saved us a couple of hours.” – Maintenance Supervisor, petrochemical site

Related or Supporting Products

• YOKOGAWA SAI143 (non‑HART variant) – Similar safety AI module without HART pass‑through if you don’t need smart diagnostics.
• YOKOGAWA AAI143-H – Standard (non‑safety) AI with HART for CENTUM VP systems; a fit when SIL isn’t required but HART is desired.
• YOKOGAWA SDV144 – Safety digital input module; often paired for ESD or interlock logic alongside SAI143H analog trips.
• YOKOGAWA SDO144 – Safety digital output module for final element actuation in the same SCS rack.
• Baseplates and terminal blocks for ProSafe-RS I/O – Ensure compatibility with your existing SCS node and cabinet layout.

Installation & Maintenance

• Cabinet environment – Install in a controlled enclosure meeting SIS cabinet standards; allow clean airflow and keep ambient 0–55 °C.
• Wiring – Use shielded twisted pair for 4–20 mA; land shields at one end to avoid ground loops. Provide external loop power as required.
• Grounding – Bond cabinet ground to plant earth; keep analog and power return paths separated where practical.
• Ventilation – Maintain spacing for convection; avoid routing high‑voltage wiring adjacent to low‑level analog runs.
• Commissioning – Perform loop checks with HART to verify PV scaling and tag identity; document any range/alarm settings in the SCS.
• Routine maintenance – Periodic terminal re‑torque, dust cleaning, and HART health scans typically catch issues early.
• Firmware & configuration – Keep SCS firmware and I/O definitions aligned; update only under MOC and with a validated rollback plan.

Quality & Certifications

• Safety: Suitable for use in SIL-rated applications within ProSafe-RS (IEC 61508 framework)
• CE marking for EMC and LVD (typical for Yokogawa I/O)
• UL/CSA registration in many cases for control equipment
• RoHS-compliant build
• Manufacturer’s warranty: typically 1 year; we provide a 365-day warranty on supplied units

If you’re aiming to standardize on HART-enabled safety inputs without expanding cabinet count, the SAI143H tends to be the practical pick. You might notice the diagnostics payoff immediately during loop checks and later when devices start drifting—exactly where safety and maintainability meet.