Product Description

The Yokogawa SAI143-H03/A4D00 is a high-integrity analog input module designed specifically for Safety Control Units (SCU) and Safety Node Units (SNU). It provides 16 fully isolated current input channels, making it a core component in Safety Instrumented Systems (SIS) where deterministic response, accuracy, and electrical protection are critical.

The module supports 2-wire and 4-wire transmitter configurations, selectable per channel via hardware setting pins, allowing flexible connection of loop-powered and externally powered field devices. With a fast 40 ms internal data refresh rate and high dielectric withstand capability, the SAI143-H03/A4D00 ensures reliable signal acquisition while protecting the safety system backplane from field-side electrical disturbances.

Technical Specifications

Application Scenarios

The SAI143-H03/A4D00 is intended for safety-critical analog input loops in Yokogawa ProSafe-RS and safety-integrated CENTUM architectures. Typical applications include:

• Emergency Shutdown (ESD) systems

• Fire & Gas detection monitoring

• High-pressure and over-temperature protection loops

• Offshore platforms, chemical reactors, and LNG facilities

Its precision and fast update cycle make it suitable for SIL-rated protection functions.

FAQ

Q: How do I select between 2-wire and 4-wire transmitter modes?
Each channel is configured using physical setting pins on the module, allowing independent selection of loop-powered (2-wire) or externally powered (4-wire) operation.

Q: What is the difference between the “S” and “H” versions of the SAI143?
The H-version (High-precision) supports a wider effective measurement range (0.05–23 mA) while maintaining accuracy, compared to the standard S-version, which is optimized for the nominal 4–20 mA range.