Description
The Yokogawa AAR181-S50 S2 is a 12-channel isolated resistance temperature detector (RTD) input module designed for the CENTUM VP Field Network I/O (FIO) distributed control system architecture. It acquires temperature signals from 3-wire Pt100 sensors, converts the resistance variations into digital process data, and communicates measurements to the Field Control Unit (FCU) via the ESB bus.
Procurement and Availability Status
- Condition: New Surplus / Factory Sealed (verify exact hardware revision batch upon inquiry)
- Standard Lead Time: 3 to 5 business days for stocked inventory; 2 to 4 weeks for factory-sourced allocations
- Warranty: 12-month standard replacement warranty from date of invoice
- Pricing Note: Listed price is indicative and subject to market fluctuations. Contact our engineering sales desk for a formal, time-sensitive quotation.
Technical Specifications
| Parameter | Value |
| Manufacturer | Yokogawa |
| Product Model | AAR181 |
| Suffix / Revision Code | -S50 S2 (Standard type with pressure clamp terminal connection) |
| Module Type | Isolated RTD Input Module |
| Input Channels | 12 channels per module |
| Supported Sensor Types | Pt100 (3-wire configuration) |
| Withstand Voltage | 1,500 V AC between field circuit and system backplane (1 minute) |
| Allowable Input Voltage Range | \pm5 V DC |
| Diagnostics | Built-in burnout detection (open circuit alarm, upper/lower limit failure detection) |
| Current Consumption | Max 450 mA at 5 V DC (supplied from baseplate backplane) |
| Field Termination | Pressure clamp terminal baseplate |
| Operating Temperature | 0 to +50°C |
| Enclosure Protection | IP20 (intended for installation inside sealed industrial control cabinets) |
| Compliance Standards | CE, cULus, IEC 61131-2, G3 conformal coating options available |
Engineering and Integration Notes
The AAR181-S50 is deployed across continuous process industries (such as chemical reactors, oil and gas fractionators, and power plant auxiliary loops) for high-precision thermal monitoring.
- Hot-Swap Support: The module supports online replacement (hot-swapping) on compatible CENTUM VP FIO node baseplates (such as ANB10D or ANB11D) without requiring a complete system shutdown.
- Sensor Wiring: Maintain strict adherence to 3-wire balancing requirements. Resistance imbalances across lead wires will introduce systematic temperature measurement offsets. Ensure shielded cables are grounded properly at the cabinet busbar to mitigate inductive interference.
- Software Configuration: Enable sensor burnout detection parameters inside the CENTUM VP engineering environment to ensure safety interlocks trip cleanly upon an open-circuit sensor failure.
Frequently Asked Questions
Q: Can the AAR181-S50 be used interchangeably with other RTD module variants like the AAR181-S53?
A: No. Suffix codes denote specific terminal block styles, safety ratings, or hardware release indexes. Always verify that the replacement model matches the exact suffix code specified in your system hardware bill of materials.
Q: What do the front panel LED indicators signify during operation?
A: The faceplate LEDs display module operational status, internal hardware diagnostics, and ESB bus communication health. A solid fault indicator typically points to an internal channel fault or configuration mismatch.
Q: Are terminal blocks included with the replacement module?
A: Standard module shipments typically include the electronics card itself. Pressure clamp terminal blocks mounted on the baseplate are usually retained from the existing installation, but complete unit bundles can be supplied upon request.
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