Product Description
The SAI143-H53/A4S00 is a high-reliability analog input module designed for the Yokogawa Electric Corporation ProSafe-RS Safety Instrumented System (SIS) platform.
This module functions as a 16-channel 4–20 mA current input interface for safety-critical process monitoring. It is commonly used to acquire field signals representing:
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Pressure
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Temperature
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Flow rate
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Other SIL-rated process variables
The module provides continuous loop health diagnostics, allowing immediate detection of open circuits or short wiring faults. Its compact, lightweight design supports high-density installation in ProSafe-RS SIS I/O nests for large-scale safety architectures.
Although sometimes mislabeled in legacy catalogs as a "power supply" component, the SAI143-H53 is strictly an analog input acquisition module. It may support loop-powered transmitter circuits but does not function as a system power supply.
Detailed Technical Specifications
| Parameter | Specification |
|---|---|
| Model Designation | SAI143-H53 |
| Full Order Code | SAI143-H53/A4S00 |
| System Platform | ProSafe-RS SIS |
| Input Channels | 16 isolated channels |
| Signal Type | 4–20 mA DC analog current |
| Input Impedance | 250 Ω |
| Conversion Accuracy | High-precision safety measurement |
| Safety Integrity Level | SIL3 capable (when used in redundant architecture) |
| Redundancy Support | Dual-module redundant configuration |
| HART Communication | Supported (bidirectional pass-through) |
| Dimensions | 2.2 cm × 18.1 cm × 12.7 cm |
| Weight | 0.18 kg |
Safety Application Scenarios
The SAI143-H53/A4S00 is widely deployed in high-risk process protection systems such as:
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Emergency Shutdown (ESD) systems
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Fire & Gas (F&G) safety monitoring loops
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Offshore oil and gas production facilities
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LNG liquefaction plants
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Petrochemical refining plants
The module ensures safety logic solvers receive accurate and verified process measurements, allowing protective shutdown actions to be executed precisely when process thresholds are exceeded.
Frequently Asked Questions
Is this module a power supply unit?
No. The SAI143-H53/A4S00 is an analog input module. It receives 4–20 mA signals from field transmitters. It may support loop-powered transmitter operation but does not provide system-level power supply output.
What does the /A4S00 suffix mean?
The A4S00 suffix typically represents a standard hardware configuration with specific connector, coating, or terminal compatibility options for ProSafe-RS safety I/O boards.
Is redundancy required for SIL3?
Yes. SIL3 safety integrity is typically achieved using redundant module pairing and appropriate system-level safety architecture design.
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