Description
YOKOGAWA SAI533-H33 Product Overview
The YOKOGAWA SAI533-H33 is a high-performance, intrinsically safe analog input module designed for hazardous area applications in oil & gas, chemical, and pharmaceutical industries. As part of Yokogawa’s advanced I/O system, this module provides 16 channels of isolated analog input with Ex ia certification for Zone 0/1 installations.
Key Features
✔ 16-channel intrinsically safe analog input
✔ ATEX/IECEx Zone 0/1 certification
✔ Universal signal support (TC, RTD, 4-20mA, 0-10V)
✔ ±0.1% accuracy for precise measurement
✔ Hot-swappable design for maintenance without shutdown
Technical Specifications
| Parameter | Specification |
| Model | SAI533-H33 |
| Manufacturer | YOKOGAWA |
| Type | Intrinsically Safe Analog Input Module |
| Channels | 16 |
| Input Signals | TC (J/K/T/E/R/S/B/N), RTD (Pt100/JPt100), 4-20mA, 0-10V |
| Hazardous Area Cert. | ATEX, IECEx (Zone 0/1) |
| Accuracy | ±0.1% of span (voltage/current), ±1°C (TC) |
| Isolation | Channel-to-channel & field-to-system |
| Barrier Type | Entity & FISCO approval |
| Operating Temp. | -20°C to +60°C |
| Power Supply | 24V DC (intrinsically safe) |
| Mounting | DIN rail (TS35) |
| Dimensions | 45mm (W) × 130mm (H) × 120mm (D) |
YOKOGAWA SAI533-H33
Main Features & Benefits
1. Intrinsically Safe Design
ATEX/IECEx Zone 0/1 approval for explosive atmospheres
Entity & FISCO barriers for flexible installation
Galvanic isolation for field safety
2. High-Precision Measurement
±0.1% accuracy ensures reliable process data
Cold junction compensation for TC inputs
Advanced filtering for noise immunity
3. Maintenance & Diagnostics
Hot-swappable without system shutdown
Per-channel LED diagnostics for quick troubleshooting
Predictive maintenance alerts via system software
Application Field
Oil & Gas (Hazardous Areas)
✔ Offshore platform instrumentation
✔ Refinery process monitoring
✔ Gas compression stations
Chemical/Pharmaceutical
✔ Reactor temperature monitoring
✔ Batch process control
✔ Solvent handling areas
Power Generation
✔ Turbine lube oil temperature
✔ Hydrogen-cooled generator monitoring
YOKOGAWA SAI533-H33
Related Products
| Model | Description |
| SAI533-H63 | 32-channel IS version |
| SAO533-H33 | IS analog output module |
| SDI533-H33 | IS digital input module |
| FCS401-IS | Intrinsically safe field control station |
| YTA320-IS | IS temperature transmitter |
Installation & Maintenance
Installation Guidelines
Must be installed by certified personnel
Follow Ex cabling requirements (shielded, proper grounding)
Verify entity parameters match field devices
Maintenance Recommendations
Annual calibration check (Ex-certified equipment only)
Quarterly terminal inspections
Firmware updates via Yokogawa tools
