The Yokogawa SAI143-H53 S3 is a high-reliability analog input module designed for the ProSafe-RS safety instrumented system (SIS). This module provides 16 channels for interfacing with 4 to 20 mA field signals, ensuring precise monitoring of critical process variables. Featuring the “S3” hardware style, it is engineered for high availability and strict adherence to safety standards, supporting SIL 3 applications in a redundant configuration. The “H53” designation indicates specific hardware enhancements, including conformal coating for superior protection against harsh industrial environments.
Technical Specifications (Product Datasheet) Model Number: SAI143-H53 S3 System Series: ProSafe-RS / Vnet/IP Module Style: S3 Number of Channels: 16 (Isolated) Input Signal: 4 to 20 mA DC Safety Integrity Level: SIL 3 (Redundant) / SIL 2 (Single) Input Impedance: 250 Ω Accuracy: ±0.1% of full scale Operating Temperature: -20°C to +70°C Storage Temperature: -40°C to +85°C Relative Humidity: 5% to 95% (Non-condensing) Power Consumption: 24 V DC, 280 mA (Internal) Length: 130 mm Width: 40 mm Height: 145 mm Weight: 0.55 kg Country of Origin: Japan
Applications The SAI143-H53 S3 is a cornerstone of safety automation in sectors such as petrochemicals, upstream oil and gas, and power generation. It is used to monitor critical sensors for Emergency Shutdown (ESD) systems, Fire and Gas (F&G) detection, and Burner Management Systems (BMS). Its primary role is to provide the safety controller with accurate, real-time data from pressure, level, and flow transmitters, enabling the system to detect hazardous conditions and execute protective logic instantly.
Operating Instructions The module must be installed in a compatible Yokogawa I/O baseplate within a ProSafe-RS rack. Before installation, confirm the field wiring is compatible with 16-channel 4-20mA inputs and that the rack power is within limits. Slide the module into the designated slot until the connectors are fully engaged and the locking mechanism is secure. For high-reliability applications, use the module in a redundant pair to ensure uninterrupted monitoring even if one module fails. Configuration should be performed via the ProSafe-RS Engineering Station, where parameters for signal filtering and line diagnostics (open/short circuit detection) must be defined according to the project’s safety requirements.
Q&A – Frequently Asked Questions Question: What is the benefit of the “H53” conformal coating? Answer: The “H” in H53 signifies that the circuit board is treated with a protective coating that resists corrosion from moisture, salt spray, and chemical gases like H2S, extending the module’s lifespan in coastal or chemical plant environments.
Question: Can this module be hot-swapped while the system is running? Answer: Yes, the SAI143 supports hot-swapping. In a redundant configuration, removing one module will not interrupt the process as the partner module takes over the full monitoring load.
Question: Does the SAI143 support HART communication? Answer: Yes, the SAI143 allows for HART signal pass-through, enabling maintenance teams to perform remote diagnostics and calibration on field instruments using Plant Resource Manager (PRM) software.
Learn More & Purchasing For competitive pricing and availability of the YOKOGAWA SAI143 and other ProSafe-RS safety modules, please visit our online industrial catalog.
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