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Yokogawa SAI533-H33/PRP
Product Type: Analog Input Card (Redundant)
Product Introduction:
The SAI533-H33/PRP is an 8-channel redundant analog input module for Yokogawa’s CENTUM VP and CENTUM CS distributed control systems. It accepts multiple input signal types and provides redundant data paths to ensure continuous operation in safety-critical and high-availability process control applications.
Detailed content
Model Code Breakdown:
- SAI533 — Analog Input Module, 8 channels, CENTUM VP/CS
- H33 — Input type: 8 channels of 4–20 mA DC (2-wire) input
- PRP — Parallel Redundancy Protocol (hot-standby redundant configuration)
Technical Specifications:
| Parameter | Value |
|---|---|
| Number of Channels | 8 channels |
| Input Signal | 4–20 mA DC (2-wire transmitter) |
| Input Resistance | 250 Ω |
| A/D Resolution | 16-bit |
| Sampling Rate | 100 ms per channel (8 channels = 800 ms total) |
| Accuracy | ±0.1% of F.S. |
| Isolation | Channel-to-channel isolation, 500 VDC |
| Redundancy | PRP (Parallel Redundancy Protocol) — hot standby, automatic failover < 10 ms |
| Communication | Vnet/IP (CENTUM VP), Ethernet (CENTUM CS) |
| Operating Temperature | 0°C to +55°C |
| Power Supply | 5 VDC (bus-powered from I/O base) |
| Dimensions | Standard CENTUM I/O card size: 25 x 160 x 120 mm |
| Certifications | CE, FM, CSA, ATEX (for hazardous area variants) |
Functional Features:
- 8 independent analog input channels with individual scaling and engineering units
- Redundant configuration (PRP): Second module operates in hot standby; automatic switchover on failure
- Channel diagnostics: Open circuit, short circuit, out-of-range detection per channel
- Linearization: Square root extraction, custom linearization tables
- Retransmission: Analog output retransmission option (via separate module)
Structural Features:
- Standard CENTUM VP/CS I/O card format
- Plugs into I/O base unit (Vnet/IP bus)
- LED indicators per channel: Normal, Alarm, Fault
- DIP switches for channel configuration (optional, typically software-configured)
Applicable Industries:
- Oil refineries
- Chemical plants
- Power stations
- Water treatment
- Any CENTUM VP/CS DCS installation requiring high-availability analog inputs
Installation Requirements:
- Insert into designated slot in CENTUM VP/CS I/O base unit
- Use shielded twisted-pair cable for all 4–20 mA inputs
- Ensure proper termination resistance at the DCS end (typically 250 Ω built into module)
- Verify redundant pair configuration in the DCS engineering software
Usage Precautions:
- Do not apply voltage > 30 VDC to any input channel
- Verify input signal type matches H33 configuration before commissioning
- Perform channel calibration check annually as part of preventive maintenance
- Do not hot-swap the module unless the system supports online module replacement
