When a Turbine Train Loses Its Vibration Signal
A compressor train on a gas processing site trips without warning. The cause is not mechanical. The extension cable between the proximity probe and the Proximitor module has failed, and the machine protection system loses its radial vibration reading. Engineers need a matching replacement fast, not a re-engineered measurement chain.
The Bently Nevada 142238-120-00-CN is built for exactly this situation. It is a probe proximity vibration cable from Bently Nevada, made in the U.S.A., with a total length of 12 metres and a standard cable option. It is a direct-fit spare for 3300 and 3300 XL measurement loops, so the repair stays simple and the machine returns to service sooner.
What the 142238-120-00-CN Actually Is
This is a 12-metre extension cable assembly. Bently Nevada specifies it for use with a 2-metre 3300 or 3300 XL probe, paired with the 170133-140-XX 3300 14-metre Internal Proximitor Module. That combination gives maintenance teams a known, tested signal path rather than a mix of unmatched parts.
The part number itself carries the configuration. The 120 segment sets the total length at 12 metres. The 00 segment confirms the standard cable option. The CN suffix marks the agency approval option, which is country specific; the CN Approvals Option Quick Reference Guide and Field Notification Letter sit in the download section for verification.
Key Parameters at a Glance
| Specification | Value |
|---|---|
| Manufacturer | Bently Nevada |
| Product number | 142238-120-00-CN |
| Product type | Probe Proximity Vibration |
| Total length | 12 metres |
| Connector and cable option | 00 – Standard cable |
| Agency approval option | CN – country specific |
| Country of origin | Made in U.S.A. |
| Compatible probe | 2-metre 3300 or 3300 XL probe |
| Compatible module | 170133-140-XX 3300 14-metre Internal Proximitor Module |
Where This Cable Earns Its Place
On a steam turbine in a refinery, radial vibration channels feed the protection system. A damaged extension cable can silence a channel and force an unnecessary outage. The 12-metre length covers the run from the probe mounting to the Proximitor housing without adding joints.
In a gas compression station, the same cable supports axial position and vibration monitoring on the compressor driver. Matching the probe, cable and module as Bently Nevada intends keeps the loop electrically consistent.
For plant upgrades, this assembly is a practical replacement item. Teams can swap the cable during a planned shutdown and keep the existing 3300 or 3300 XL infrastructure in service.
Fitting and Maintaining the Assembly
Route the cable away from hot surfaces and heavy vibration, and secure it so the connector sees no strain. Keep bends within the cable’s natural limits, and protect the connector during handling. Follow the manufacturer’s installation and safety documentation for the probe and Proximitor module.
During routine inspections, check the connector for contamination, look for chafing along the run, and confirm the cable remains properly clamped. Replace damaged cables before they cause a channel loss. Because this is a measurement component, general inspection is the right approach; internal repair is not.
Before You Order
Confirm the probe length, the Proximitor module part number, and the required agency approval option for your region. The CN option is country specific, so review the reference guide in the download section.
Please verify current lifecycle status and availability with Oil AutoTech before ordering. Oil AutoTech supplies fast-dispatch spares for oil, gas and industrial automation, with quick worldwide delivery and hands-on technical selection help. Contact Oil AutoTech today for pricing and availability.
