Bently Nevada TACH100-01 / 174652-01 Digital Tachometer – Obsolete Proximitor Series Spare Part

Technical Dossier

Product Details And Specifications

Bently Nevada TACH100-01 / 174652-01 Digital Tachometer – Obsolete Proximitor Series Spare Part

When a digital tachometer module fails inside a Bently Nevada machinery protection system, the consequences extend far beyond a single sensor. The TACH100-01 (part number 174652-01) is a speed and phase reference input module integral to rotating machinery monitoring architectures — turbines, compressors, pumps — where continuous speed signal integrity is a condition of safe operation. Bently Nevada has discontinued this module. Sourcing a replacement on the open market is no longer straightforward.

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 Bently Nevada TACH100-01 was designed for an era when rotating machinery monitoring systems were built to last 20–30 years. Many of those systems are still running. The problem is that the supply chain supporting them has not kept pace.

The TACH100-01 provides speed and phase reference signals that feed directly into vibration analysis, overspeed protection, and condition monitoring logic. In a 3500 Series rack, this is not a peripheral function — it is a core input to the protection chain. Removing it from service without a direct replacement means either bypassing protection logic (an unacceptable safety risk) or shutting down the train.

How critical spare inventory extends asset life by 5–10 years:

For plant managers operating under deferred maintenance budgets and aging infrastructure, the calculus is not complicated. The TACH100-01 is not a consumable — it is an asset protection instrument. Treat it accordingly.

Condition & Reliability Assurance

Obsolete modules sourced from secondary markets carry real risk. DriveKNMS applies a structured 5-step quality process to every unit before it ships:

1. Visual and mechanical inspection. Full external examination for physical damage, pin corrosion, connector wear, and housing integrity. Units with compromised connectors are rejected at this stage.
2. Electrolytic capacitor assessment. Aged electrolytic capacitors are the primary failure mode in electronics stored beyond their design service life. Each unit is assessed for capacitor condition; units showing evidence of electrolyte leakage or bulging are not offered for sale.
3. Firmware and label verification. Where applicable, firmware revision is confirmed against known compatible versions for the target rack system. Part number labels and revision markings are cross-referenced against OEM documentation.
4. Pin and contact integrity check. All connector pins are inspected for oxidation, bending, and contact resistance. Corroded contacts are a common cause of intermittent faults in legacy modules.
5. Functional verification record. Each unit's inspection findings are documented. Customers receive a condition report on request.

Key Features for System Maintenance

How do I know the unit is genuine and not counterfeit?
All units are sourced through documented supply channels. Part number markings, revision labels, and physical construction are verified against OEM reference documentation during our inspection process. We do not sell units that cannot be verified as genuine Bently Nevada manufacture.

Should I buy more than one unit?
For any facility operating more than one train with this module installed, holding a minimum of two spares is a defensible maintenance strategy. The OEM will not manufacture additional units. Secondary market availability will decrease over time, not increase. Current pricing reflects current sourcing status — future sourcing will be more difficult and more expensive.

Can you source other Bently Nevada obsolete modules?
Yes. DriveKNMS specializes in hard-to-find and discontinued industrial automation components across multiple OEM brands. Contact us with your part number.