Description
Product Introduction
The Yokogawa ASI133-H00/SA3S0 is an 8-channel isolated analog input module designed for Yokogawa CENTUM VP and CS 3000 Distributed Control Systems (DCS). Featuring a built-in intrinsic safety barrier, this Field I/O (FIO) module interfaces 4-20 mA field transmitters operating in hazardous areas directly to the control network without requiring external barrier racks or additional cabinet wiring.
Equipped with the /SA3S0 suffix option, this specific build includes ISA Standard G3 conformal coating for aggressive atmospheric protection and an expanded operational temperature window (-20 °C to 70 °C). Its channel-to-channel galvanically isolated architecture eliminates ground loop interference, making it an indispensable component for critical, high-reliability process loops in offshore platforms and chemical processing plants.
Key Technical Specifications
| Parameter | Value |
| Product Line | Yokogawa CENTUM VP / CS 3000 (FIO) |
| Module Type | Analog Input Module with Built-in Barrier |
| Number of Channels | 8 channels, galvanically isolated channel-to-channel |
| Input Signal Range | 4 to 20 mA DC |
| Transmitter Power Supply | 15.0 V DC minimum (at 20 mA) |
| Allowable Input Current | 25 mA |
| Accuracy | \pm 16 \muA (\pm 0.1\% of full scale) |
| Data Refresh Rate | 10 ms |
| Conformal Coating Option | ISA Standard G3 harsh environment protection |
| Operating Temperature | -20 °C to +70 °C |
| Backplane Power Consumption | 5 V DC, 584 mA max |
Application Scenarios & The “Trench” Experience
Picture this: It’s 2:00 AM on an offshore gas platform in the Gulf. A localized power transient on a remote wellhead junction box causes a ground loop that burns out an analog channel on a critical pressure loop. The DCS flags an open-wire alarm, and safety interlocks begin throttling production. You cannot afford to trace ground loops or re-wire external Zener barriers down in the wellhead cellar. You pull a pre-tested ASI133-H00/SA3S0 from the emergency spares locker, verify the suffix flags match, and swap out the module to restore telemetry before the safety system trips the entire train.
- Offshore Oil & Gas Platforms: Interfacing 4-20 mA pressure and level transmitters located in Class I, Div 1 / Zone 0 hazardous locations directly to CENTUM nodes.
- Petrochemical Refining: Processing critical flow and temperature loops in sulfur recovery and alkylation units under harsh corrosive environments.
- Pharmaceutical Batch Processing: Managing high-accuracy analog monitoring in environments requiring strict G3 environmental resistance against airborne contaminants.
ASI133-H00SA3S0
ASI133-H00SA3S0
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Yokogawa racks. Every surplus ASI133-H00/SA3S0 unit goes through a strict verification process before leaving our warehouse:
- Inbound Inspection: Microscopic pin inspection, anti-counterfeit label check, and verification of original Yokogawa factory conformal coating integrity.
- Live Rig Testing: Slotted into an active Yokogawa FIO node linked to a CENTUM test station to confirm node recognition and clear CPU communication errors.
- Loop Calibration Check: Precision 4-20 mA signal injection across all 8 isolated channels simultaneously to verify linearity, A/D conversion accuracy, and transmitter power output supply voltages.
- Firmware & Revision Logging: Verifying internal EEPROM revisions and logging serial numbers against QA records.
- Final QC & Anti-Static Packaging: Vacuum-sealed in humidity-controlled anti-static bags with custom ESD foam casing.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Check the Option Code Suffix: The
/SA3S0suffix denotes specific G3 conformal coating and extended temperature ratings. Swapping in a standardASI133-H00/S00card in a harsh corrosive environment will lead to premature trace degradation and early card failure. - ❗ Respect the Intrinsic Safety Barrier: Because this module features built-in safety barriers, never use a standard multimeter to measure current across field terminals while wired to explosive area field devices without following hot-work permits. Always use intrinsic safety-certified calibration equipment.
- ⚠️ Terminal Block Compatibility: Double-check your signal cable mounting blocks (e.g., KS cable interfaces or pressure clamp terminal blocks). Ensure the ground continuity strip is clean and securely bonded to the chassis frame to maintain ESD and surge protection across all channels.
Frequently Asked Questions (FAQ for Conversion)
Q: Can I replace an ASI133-H00/S00 with an ASI133-H00/SA3S0?
A: Yes. The / variant includes additional environmental hardening (G3 conformal coating and -20 to 70^\circC operating range). It is fully backward-compatible with the standard /S00 module.
Q: Is the ASI133-H00/SA3S0 hot-swappable in a CENTUM VP rack?
A: Yes, FIO modules support hot-swapping under powered conditions, provided the system software and baseplate hardware configuration allow online maintenance. However, always exercise care when working around intrinsically safe field wiring.
Q: Are these modules new or refurbished?
A: Our stock primarily consists of New Surplus and Factory Sealed inventory sourced through global plant liquidations and system upgrades. Every unit undergoes live bench-testing on an actual Yokogawa test node before shipment.
Q: Why purchase surplus Yokogawa components instead of buying direct from the OEM?
A: Yokogawa direct lead times for legacy or specialized FIO modules can extend to several months, and OEM lifecycle markups are high. We stock original, certified surplus hardware ready for immediate dispatch to prevent costly plant downtime.
Q: What warranty is provided with the module?
A: Every ASI133-H00/SA3S0 module includes our standard 12-month full replacement warranty.
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