Bently Nevada 330903-02-16-05-02-00 Proximity Probe

The 330903-02-16-05-02-00 belongs to the 3300 XL NSv series of eddy-current proximity probes. This sensor targets small-target measurement in reciprocating compressors and small steam turbines. Its compact design fits tight installation spaces where standard probes cannot reach.

Technical Specifications

Parameter	Value
Model	330903-02-16-05-02-00
Category	3300 XL NSv Proximity Probe
Probe Tip Diameter	5 mm
Linear Range	0 to 1.5 mm (typical)
Incremental Scale Factor	7.87 V/mm ± 6.5%
Frequency Response	0 to 10 kHz
Operating Temperature	-35°C to +177°C (probe)
Cable Length	1.6 m
Weight	Approx. 0.18 kg (probe with cable)
Connector	Coaxial, 3-pin Mil-spec
Mounting Thread	M8 × 1 or 5/16-24 UNF
Power Supply	-17.5 Vdc to -26 Vdc
Output Impedance	50 Ω nominal
Part Count	Single probe assembly

Measurement Principle and Interface

Eddy-current technology enables non-contact displacement measurement on ferrous targets. The driver sends a high-frequency signal through the coaxial cable to the probe coil. Subsequently, target movement modulates coil impedance and produces a proportional voltage output. The 330903-02-16-05-02-00 pairs with 3300 XL extension cables and Proximitor drivers for signal conditioning.

Installation and System Integration

Operators mount the probe through a threaded hole with a locknut. A minimum target size of 15 mm diameter ensures accurate linear response. Meanwhile, the narrow 5 mm tip allows close spacing between measurement channels. This design reduces cross-talk in dense sensor arrays. The system also supports reverse-mount configurations for confined spaces.

Energy Storage and Power Considerations

The Proximitor driver draws power from a -24 Vdc rail, typically 12 mA maximum. No internal battery or capacitor stores energy in the probe itself. Instead, external modules handle signal demodulation and power regulation. Therefore, system designers must budget for a dedicated DC supply per channel.