BENTLY 125736-01 | Proximitor Extension Cable, 5 Meters

Description

Product Introduction

That compressor station in Alberta—the one with the Bently 3500 monitoring system—had a “probe fail” alarm last winter. The techs swapped the probe, the driver, even the monitor card. Nothing. I walked over, looked at the 125736-01 extension cable between the probe and the driver. The connector at the probe end was loose—someone hadn’t tightened it properly, and vibration had worked it loose. The center pin was making intermittent contact. A quarter-turn with a wrench, problem gone. The cable was fine. The installation wasn’t.

The BENTLY 125736-01 is a 5-meter extension cable for Bently Nevada 3300 XL proximity probes. It’s a coaxial cable with a special 3/8-24 threaded connector on both ends—one end mates to the probe, the other to the Proximitor driver. The cable carries the high-frequency RF signal that makes eddy current sensing work. It’s built to survive in harsh environments: -40 to +177 °C, oil-resistant jacket, and a stainless steel braid for mechanical protection. In a typical installation, the probe mounts near the shaft, the cable runs through a conduit to the Proximitor in a safe area, and the Proximitor converts the signal to a voltage for the monitor.

Key Specifications

Quality Inspection Process (SOP Transparency)

A cable is simple, but we test every one.

1. Incoming Verification
   • Match the model: 125736-01. (There’s a -02 for 7 meters, -03 for 9 meters.)
   • Visual inspection: Check the connectors—threads should be clean, no damage.
   • Inspect the cable jacket—no cuts, no kinks.
   • Look for the Bently Nevada logo and part number on the connector.
2. Continuity Test
   • Use a multimeter to verify center pin to center pin—<1Ω.
   • Verify shield to shield—<1Ω.
   • Check for shorts between center and shield—infinite resistance.
3. Hi-Pot Test
   • 500V between center and shield—>10 MΩ.
   • No breakdown.
4. Connector Torque Test
   • Mate the cable to a test probe and driver.
   • Tighten to spec (hand-tight plus 1/8 turn with a wrench).
   • Verify the connection is solid—no wobble.
5. Flex Test
   • Bend the cable in a 90° arc 10 times, then retest continuity—no intermittent opens.
6. Final QC & Packaging
   • QC sticker with test date and operator initials.
   • Coil the cable loosely (no tight bends), secure with a tie.
   • Box individually or in bulk packs.
   • Test report included—continuity and isolation values.

Field Replacement Pitfalls

I’ve seen these cables fail in more ways than you’d think. Here’s where people go wrong.

❗Connector Tightness
The 3/8-24 connectors must be tight—hand-tight plus 1/8 turn with a small wrench. If they’re loose, the center pin may not make contact, or the shield may be intermittent. Use a wrench, but don’t overtighten.

Cable Routing
The cable has a minimum bend radius of 25 mm. If you bend it sharper than that, you can damage the internal dielectric, changing the impedance and affecting the signal. Plan your conduit runs accordingly.

Connector Cleaning
Dirty connectors can cause intermittent signals. If you’re working in a dirty environment, clean the threads and center pin with contact cleaner before mating.

Moisture
The cable is rated for high temperature, but it’s not waterproof. If moisture gets into the connector, it can cause signal drift. Use dielectric grease on the threads in wet environments.

Grounding
The cable shield is connected to the connector shells. In some installations, you may need to isolate the shield to prevent ground loops. Bently has specific grounding recommendations—follow them.

*Nail these five, and your 125736-01 will outlast the machine.*

New Original vs. Refurbished: Why It Matters

“New Original (New Surplus)” means this cable was manufactured by Bently Nevada, packed in its original bag, and never installed. The connectors have never been mated, the jacket hasn’t been flexed, and the dielectric is pristine.

Refurbished risk in plain terms
A refurbished cable is usually a pulled cable from a decommissioned machine. The connectors may have worn threads, the jacket may have cuts, and the internal dielectric may have been damaged by sharp bends. It might test okay initially but fail later.

Real cost of a refurbished failure
If this cable has an intermittent open, you could spend hours troubleshooting a vibration signal dropout. The labor cost alone exceeds the price of a new cable.

What we provide as proof

• Bently bag (or photos).
• Continuity test report.
• 12‑month warranty.

Pricing context
We’re priced 20% above the cheapest used cables and 10% below Bently’s list price. That pays for the fresh connectors and the warranty.

Performance Benchmarks & Test Results

Test conditions: Fluke multimeter, ambient 24 °C.

We keep the continuity printout—ask, and we’ll email it.

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