
Product Description
Yokogawa SAI143-H63 Analog Input Module - Precision Current Measurement for DCS
The Yokogawa SAI143-H63 delivers industrial-grade analog signal acquisition for distributed control systems where measurement integrity directly impacts process quality and safety. This 16-channel current input module transforms 4-20mA transmitter signals into high-resolution digital data with module-level isolation that protects your control network from field-side electrical disturbances.
Core Technical Specifications
- Input Channels: 16 independent 4-20mA current inputs
- Signal Range: 0-20mA or 4-20mA (software configurable per channel)
- Resolution: 16-bit A/D conversion (65,536 counts)
- Accuracy: ±0.1% of full scale at 25°C
- Isolation: Module-to-bus isolation (1500V AC for 1 minute)
- Input Impedance: Approximately 250Ω (typical for 4-20mA loops)
- Conversion Speed: 100ms per channel (typical scan cycle)
- Temperature Drift: ±0.02%/°C maximum
- Operating Temperature: 0°C to +55°C (32°F to 131°F)
- Power Consumption: 2.5W maximum from DCS backplane
- Diagnostic Features: Open circuit detection, over-range alarm, module health monitoring
- Compliance: CE, UL508, FM Class I Div 2, ATEX Zone 2
Real-World Application Scenarios
Chemical Batch Processing: Monitor reactor temperature, pressure, and flow transmitters simultaneously during multi-stage synthesis operations. The SAI143-H63's 16-bit resolution captures subtle process variations that indicate reaction completion or deviation from setpoint, enabling tighter batch-to-batch consistency.
Water Treatment SCADA: Acquire data from pH sensors, turbidity meters, chlorine analyzers, and flow transmitters across clarification and filtration stages. Module isolation prevents ground loop currents between geographically separated sensor locations, eliminating measurement noise that could trigger false alarms.
Power Generation Monitoring: Interface with vibration sensors, bearing temperature RTDs (via transmitters), and lube oil pressure transducers on turbine-generator sets. The module's ±0.1% accuracy ensures compliance with condition monitoring standards while diagnostic features alert operators to sensor failures before they cause unplanned shutdowns.
Engineering Solutions & Integration
The SAI143-H63 addresses the challenge of consolidating multiple 4-20mA signals into a single I/O point, reducing wiring complexity and panel space requirements. Each channel operates independently—configure some for 0-20mA and others for 4-20mA within the same module to accommodate mixed transmitter types without additional signal conditioning.
Module-level isolation eliminates the need for external isolators when connecting sensors across different ground potentials, such as tank-mounted level transmitters and pipe-mounted flow meters. The 1500V isolation barrier withstands transient voltages from lightning-induced surges or motor starter switching, protecting your DCS CPU from field-side electrical events.
Hot-swappable design allows replacement during scheduled maintenance windows without powering down the entire I/O rack. The module automatically uploads configuration from the DCS controller upon insertion, minimizing commissioning time and reducing the risk of configuration errors.
System Architecture & Compatibility
This analog input module integrates seamlessly into Yokogawa CENTUM VP, CENTUM CS 3000, and ProSafe-RS DCS platforms. Install in standard I/O racks alongside digital I/O, analog output, and communication modules to build distributed control nodes tailored to your process topology.
The module communicates with the DCS controller via the Vnet/IP or Vnet backplane network, transmitting digitized process values and diagnostic status at deterministic intervals. Redundant controller configurations automatically synchronize I/O data, ensuring continuous process monitoring even during controller failover events.
Related Products
| Product | Description | Link |
|---|---|---|
| Yokogawa AAM11 S2 | Analog Input Module for multi-range voltage/current signals | View Product |
| Yokogawa NFAI143-S50 S1 | Analog Input Module for FCN-RTU systems with 16 channels | View Product |
| Yokogawa SAI143-H53/A4S00 | Analog Input Module with enhanced diagnostics and HART support | View Product |
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