Description

Bently Nevada 137504-08 3300 XL 8 mm Proximity Probe Assembly

The Bently Nevada 137504-08, also cataloged as the 137504-08 3300 XL 8 mm Proximity Probe Assembly, operates as a dedicated hardware component for non-contact shaft displacement measurement within Bently Nevada machinery protection systems.

Hardware Specifications

Parameter	Specification
Model	137504-08
Brand	Bently Nevada
Origin	USA
Product Type	Proximity Sensors
Series	3300 XL 8 mm
Configuration	Integrated proximity probe and extension cable assembly
Measurement Principle	Eddy-current non-contact displacement measurement
Probe Tip Diameter	8 mm
Probe Overall Length	Approximately 152 mm
Cable Length	8 ft (approximately 2.4 m)
Measurement Linear Range	2 mm to 5 mm typical
Housing Material	AISI 304 stainless steel
Tip Material	Polyphenylene Sulfide (PPS)
Cable Insulation	FEP fluoropolymer
Probe Operating Temp	-52 deg C to +177 deg C
Cable Operating Temp	-52 deg C to +100 deg C
Mounting Thread Options	1/4-28 UNF or M8 x 1
Humidity Rating	Up to 100% condensing with proper connector sealing
Probe-to-Cable Tensile Strength	330 N approximately
Lead-to-Cable Tensile Strength	270 N approximately
Standards Compliance	API 670 4th Edition
Weight	Approximately 0.1 kg
Dimensions	Probe length approximately 152 mm; cable length 8 ft
Power Consumption	Passive sensing element; powered through compatible Proximitor sensor system

Eddy-Current Probe Scaling and Rotor Dynamics Monitoring

The 137504-08 uses the 3300 XL 8 mm eddy-current sensing technology to convert shaft displacement into electrical measurement signals. Therefore, the probe assembly works with compatible Proximitor sensors to provide calibrated vibration and position feedback.

Moreover, the system architecture supports gap voltage validation with standard -10 VDC target settings during installation and calibration. The measured gap voltage confirms the probe operating position and maintains correct signal linearity.

The probe assembly supports rotor dynamics analysis by measuring shaft motion without mechanical contact. In addition, the 3300 XL construction applies signal stability methods to reduce measurement interference caused by installation conditions and electromagnetic environments.

Frequently Asked Questions

Q: Does the 137504-08 require direct electrical power at the probe tip?
A: No. The proximity probe is a passive sensing component and receives excitation through the compatible Bently Nevada Proximitor sensor.

Q: What installation factor affects measurement accuracy most significantly?
A: Correct probe gap adjustment and cable routing directly affect displacement signal accuracy. Installers should verify gap voltage and maintain proper shielding practices.

Q: Can the 137504-08 connect directly to a vibration monitor input?
A: No. The probe requires a compatible Proximitor sensor to convert the eddy-current signal into a standardized monitoring output.

Field Installation Guidelines

• Install the probe using the specified mounting thread and maintain mechanical alignment with the monitored shaft surface.
• Verify the probe gap voltage during commissioning and confirm operation near the recommended -10 VDC target range.
• Route the extension cable away from high-current power conductors and electromagnetic interference sources.
• Maintain proper cable support to prevent mechanical stress at the probe-to-cable connection point.
• Connect cable shielding according to the machinery protection system grounding requirements.
• Inspect the connector sealing arrangement when operating in high humidity or condensing environments.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems