Bently Nevada TK3-2E 14700-02A Migration-Ready Vibration Transducer

Overview

Bently Nevada TK3-2E 14700-02A Migration-Ready Vibration Transducer for Legacy Control Systems

The Bently Nevada TK3-2E 14700-02A is a precision proximity transducer engineered for continuous vibration monitoring in rotating machinery applications. As legacy 3500 Series monitoring systems approach end-of-support cycles, plant engineers and reliability teams face increasing pressure to source verified drop-in replacements that preserve existing wiring infrastructure, signal conditioning chains, and machinery protection logic without triggering full system redesigns. This unit addresses that challenge directly — offering a migration-ready solution that integrates into existing 3500 Series racks with minimal downtime and no firmware re-engineering.

Whether you are replacing a failed transducer on a critical compressor train, upgrading a turbine monitoring cabinet, or executing a phased migration from an aging Bently Nevada 7200 Series installation to the 3500 platform, the TK3-2E 14700-02A provides the dimensional, electrical, and signal compatibility required for a controlled, low-risk retrofit. The unit ships pre-tested and is backed by a support terms confirmed by quotation covering manufacturing defects and signal performance under rated operating conditions.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit of the TK3-2E 14700-02A into an operating machinery protection system requires systematic pre-installation verification across several interdependent subsystems. Begin by auditing the existing 3500 Series rack configuration — confirm which monitor modules (such as the 3500/42M Proximitor/Seismic Monitor or the 3500/44M Aeroderivative Turbine Monitor) are currently installed and whether the channel assignments for radial vibration, axial position, or speed sensing will be affected by the transducer swap.

Next, inspect the extension cable and proximitor (driver) assembly. The TK3-2E system operates as a three-component set: probe, extension cable, and proximitor. If the existing proximitor (such as a 3300 XL 8mm or 3300 NSv proximitor) is still serviceable, it may be retained — but the probe and extension cable must be matched as a calibrated system. Mixing unmatched components will produce gap voltage errors and false vibration readings that can trigger spurious shutdowns on the 3500/20 Rack Interface Module.

For installations where the control cabinet also houses a 3500/15 Power Supply Module, verify that the supply rail voltage and current capacity are sufficient to support the transducer load after replacement. Aging power supplies in long-running 3500 racks may exhibit voltage droop under full channel load — a condition that becomes apparent only after a new transducer is installed and the system is re-energized. If the rack also includes a 3500/22M Transient Data Interface for machinery diagnostics, confirm that the new transducer’s sensitivity factor is correctly entered into the TDI configuration to avoid scaling errors in trend data.

Where the 3500 rack communicates upstream to a DCS or SCADA platform via a 3500/92 Communication Gateway Module using Modbus TCP or OPC, no protocol reconfiguration is required for a like-for-like transducer replacement. However, if the retrofit is part of a broader migration from a legacy 7200 Series monitoring system to the 3500 platform, the communication gateway configuration, tag mapping, and alarm setpoint database will require parallel verification before cutover. In such cases, plan for a parallel-run period where both the legacy and new monitoring channels are active simultaneously to validate signal correlation before decommissioning the old system.

Finally, if the machinery protection system interfaces with a Bently Nevada System 1 Condition Monitoring Software platform, update the asset configuration database to reflect the new transducer serial number, sensitivity, and installation date. This ensures that historical trend baselines remain valid and that alarm rationalization reviews are conducted against the correct transducer specification.

Downtime Control During System Migration

Minimizing unplanned downtime during a transducer retrofit on a critical rotating machine requires a structured pre-outage preparation protocol. Before the maintenance window opens, stage all replacement components — probe, extension cable, and proximitor if required — and verify that the replacement TK3-2E 14700-02A has been bench-tested for gap voltage output and sensitivity within the specified tolerance band. Pre-label all terminal connections on the 3500 rack I/O terminal block using the existing wiring diagram, and photograph the as-found wiring configuration before disconnecting any conductors.

During the outage, follow a strict sequence: isolate the monitor channel in the 3500 rack (place the channel in bypass mode to suppress spurious alarms during the swap), remove the failed transducer, install the replacement, re-terminate the extension cable at the proximitor, and verify gap voltage at the proximitor output before restoring the channel to active monitoring. This sequence preserves the original program logic in the 3500 monitor module — no setpoint re-entry or alarm reconfiguration is required for a like-for-like replacement.

If the retrofit is being performed as part of a scheduled turnaround where multiple transducers across a machinery train are being replaced simultaneously, coordinate the channel bypass sequence with the control room operator to ensure that the machinery protection system maintains coverage on at least one radial vibration channel per bearing location throughout the work scope. This approach protects against undetected machinery events during the maintenance window and satisfies most site safety and insurance requirements for continuous machinery protection during maintenance activities.

Upon completion, restore all bypassed channels, verify that all gap voltages are within the –10 VDC ±0.5 V acceptance window, confirm that the 3500 rack front-panel status indicators show no fault conditions, and document the as-left configuration in the site maintenance management system before returning the machine to service.

Retrofit Support FAQ

Q1: Is the TK3-2E 14700-02A a direct drop-in replacement for the original Bently Nevada unit in a 3500 Series rack?
Yes. The TK3-2E 14700-02A is dimensionally and electrically compatible with the original Bently Nevada proximity transducer specification for 3500 Series applications. Terminal wiring, signal polarity, and gap voltage requirements are identical to the original unit. No modifications to the 3500 monitor module configuration are required for a like-for-like replacement.

Q2: What commissioning steps are required after installation?
After mechanical installation and terminal re-termination, verify the proximitor output gap voltage using a calibrated voltmeter. The target gap voltage is –10 VDC ±0.5 V with the probe installed at the correct gap distance from the shaft. Confirm that the 3500 monitor module channel status indicator shows no fault, and verify that the vibration reading is within the expected baseline range for the machine at rest before returning to service.

Q3: Does this unit ship pre-tested, and what does the support terms confirmed by quotation cover?
Yes. Each TK3-2E 14700-02A unit is functionally tested prior to shipment, including gap voltage output verification and sensitivity confirmation. The support terms confirmed by quotation cover manufacturing defects and signal performance deviations under rated operating conditions. Units that exhibit out-of-specification gap voltage or sensitivity within the confirmed support period are eligible for replacement or repair at no additional cost.

Q4: What is the lead time, and is stock available for immediate shipment?
Stock is maintained for immediate shipment. Orders confirmed before the daily cut-off are typically dispatched the same business day. For large-quantity requirements or project-based procurement, contact the sales team to confirm available inventory and arrange staged delivery scheduling aligned with your maintenance outage calendar.

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Product Identification

Brand / Ecosystem

Bently Nevada
Bently Nevada

Model / Series

TK3-2E 14700-02A
3500 Series

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PLCs & Controllers

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Available on request after model and quantity confirmation

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B2B RFQ, replacement inquiry and project spare-part request

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PLC, PAC and modular controllers

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CPU, rack, power and I/O expansion

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Replacement, cabinet build and maintenance

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