The Bently Nevada 330708-00-20-50-02-05 is an 11 mm proximity probe assembly from the 3300 XL series. It includes a probe body and a permanently attached 5-meter extension cable, forming part of a complete non-contact displacement measurement system. This probe works in conjunction with a compatible Proximitor® sensor to deliver high-resolution position or vibration data.
Thanks to its larger active tip diameter, the 11 mm probe offers an extended linear range of up to 4.06 mm (160 mils). As a result, it is well suited for applications where standard 8 mm probes lack sufficient range—such as thrust position monitoring, differential expansion tracking, and rod drop detection.
Key Technical Specifications
- Model Number: 330708-00-20-50-02-05
- Product Type: 3300 XL 11 mm Proximity Probe with integrated 5 m cable
- Manufacturer: Bently Nevada (a Baker Hughes company)
- Sensitivity: 3.94 V/mm (100 mV/mil)
- Linear Range: 0–4.06 mm (0–160 mils)
- Cable Length: 5 meters (permanently attached, armored)
- Thread Size: M14 × 1.5 (standard metric mounting thread)
- Operating Temperature: –51°C to +177°C (probe tip); –40°C to +85°C (cable)
- System Compatibility: Requires 3300 XL 11 mm Proximitor (e.g., 3300/11-XX-XX)
- Applications: Axial position, differential expansion, reciprocating compressor rod drop, Keyphasor® reference
- Approvals: CSA, ATEX, IECEx (when used in approved system configurations)
- Weight: 1.04 kg
- Dimensions (Probe + Cable Reel): Approx. 280 × 260 × 40 mm
- Country of Origin: USA
- Status: Active product, not discontinued
- Minimum Order Quantity: 1 unit
- HS Code: 8537101190
Typical Applications
This probe is commonly deployed in steam turbines for differential expansion and thrust measurements. It also serves critical roles in large compressors, generators, and pumps where precise shaft position data ensures machinery protection. Additionally, its stable output supports reliable Keyphasor signal generation for phase analysis and speed detection.
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