Yokogawa 915U-2-900US Radio Telemetry Module – Obsolete YFGW Series Spare Part

Technical Dossier

Product Details And Specifications

Yokogawa 915U-2-900US Radio Telemetry Module – Obsolete YFGW Series Spare Part

When a radio telemetry module fails in a legacy field wireless network, the consequences extend far beyond a single instrument going offline. The Yokogawa 915U-2-900US is a field wireless gateway/repeater module operating in the 900 MHz ISM band, designed for use within Yokogawa's ISA100.11a-compliant field wireless infrastructure. In process plants where this module serves as the backbone of wireless sensor communication — covering remote tank farms, pipeline monitoring, or distributed field instruments — its failure can trigger a cascade: loss of real-time process data, forced manual rounds, and in the worst case, a complete shutdown of the wireless network segment.

Replacing this infrastructure with a modern equivalent is not a simple swap. It requires re-engineering the wireless network topology, re-commissioning all field devices, updating the YFGW410/510 gateway configuration, and potentially revalidating the entire instrumentation loop — a project that routinely costs six figures in engineering hours alone, before accounting for production downtime. DriveKNMS holds verified stock of the 915U-2-900US. This is not a catalog listing. Inventory is physically on hand and subject to prior sale.

Technical Specifications

Solving the Discontinued Hardware Crisis

The 915U-2-900US operates within Yokogawa's ISA100.11a field wireless ecosystem. Plants that deployed this infrastructure between 2008 and 2018 built their wireless sensor networks around this specific hardware generation. The module functions as a mesh network node — extending wireless coverage and routing data from field transmitters back to the YFGW gateway.

Yokogawa has transitioned its field wireless portfolio, and the 915U-2-900US is no longer manufactured. For plants still operating on this network generation, there is no direct modern substitute that integrates without network reconfiguration. A failed router node reduces mesh redundancy, increases the risk of communication dropouts, and in sparse network deployments, can isolate entire clusters of field instruments.

The economic case for maintaining a spare is straightforward. A single unplanned shutdown in a refinery or chemical plant typically costs between USD 100,000 and USD 500,000 per day in lost production. The cost of holding one or two spare 915U-2-900US modules is negligible by comparison. For plants with 5–10 years of remaining operational life on their current DCS/wireless infrastructure, a proactive spares strategy is the lowest-cost path to asset protection.

How to extend your automation asset life by 5–10 years through critical spare management:

• Conduct a single-point-of-failure audit. Map every wireless router node in your ISA100 network. Identify nodes with no redundant path. These are your highest-priority spares candidates.
• Establish a minimum stock level. For a network with 10–30 router nodes, holding 2–3 spare 915U-2-900US units provides meaningful protection without excessive capital commitment.
• Negotiate long-term supply agreements with specialist distributors. As global stock of this module depletes, spot-market prices will rise and availability will tighten. Securing stock now locks in current pricing.
• Document firmware versions. Ensure your spare units carry the same firmware revision as your installed base to avoid compatibility issues during emergency replacement.
• Align spares procurement with your plant's next major turnaround cycle. Budget for obsolete spares as a line item in maintenance CAPEX, not as an emergency expense.

Condition & Reliability Assurance

Obsolete hardware sourced from the secondary market carries inherent risk. DriveKNMS applies a structured 5-step inspection protocol to every 915U-2-900US unit before it is offered for sale:

1. Visual and mechanical inspection. Full examination of housing, connectors, and antenna ports for physical damage, corrosion, or evidence of prior field failure.
2. Electrolytic capacitor assessment. Capacitor aging is the primary failure mode in electronics stored beyond 10 years. Units showing capacitor bulge, leakage, or ESR deviation are rejected.
3. Pin and connector integrity check. All RF connectors and board-level pins are inspected for oxidation, cold solder joints, and mechanical deformation.
4. Firmware version verification. Where accessible, firmware revision is documented and disclosed to the buyer prior to shipment.
5. Functional power-on test. Units are powered and checked for normal initialization behavior where test infrastructure permits.

Units that do not pass all five stages are not listed for sale. Condition grade (New, Refurbished, or Tested Used) is disclosed explicitly on each order confirmation.

Key Features for System Maintenance

• Drop-in replacement. The 915U-2-900US installs directly into an existing ISA100.11a network without changes to the gateway configuration or field device addressing, provided the replacement unit carries a compatible firmware version.
• No reprogramming required. Network parameters are stored at the gateway level. A replacement router node joins the mesh automatically upon power-up in most standard configurations.
• Avoids engineering rework costs. Unlike a platform migration, a like-for-like spare replacement requires no loop re-validation, no P&ID revision, and no control system modification.
• Preserves existing field device investments. All ISA100.11a field transmitters, valve positioners, and sensors already installed remain fully operational — the router is the only component being replaced.

FAQ

What warranty applies to an obsolete spare part?
DriveKNMS provides a 90-day warranty against defects on all tested and refurbished units. New old stock (NOS) units carry a 180-day warranty. Warranty terms are confirmed in writing on the order confirmation.

How do I verify the unit is genuine and not counterfeit?
All units sourced by DriveKNMS are traceable to documented supply chain sources. We provide manufacturer labels, serial number documentation, and inspection records with each shipment. We do not source from unverified brokers.

Should I buy more than one unit?
For any plant with more than five 915U-2-900US nodes installed, holding a minimum of two spares is advisable. Global secondary market stock of this model is finite and will not be replenished. Once current distributor inventories are exhausted, sourcing will become significantly more difficult and expensive.

Can you supply multiple units for a long-term spares program?
Yes. Contact us to discuss volume pricing and reserved stock arrangements for multi-unit orders.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.