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.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

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:

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.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

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.

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.

Q: Can you support multi-unit or repeat RFQ requests?
A: Yes. Send the model list, target quantity and destination so DRIVEKNMS can review sourcing options and quote the requirement as a project RFQ.