Bently 330105-02-12-10-02-CN 3300‑XL 8 mm Eddy‑Current Proximity Probe

Description

Hardware Specifications

• Part Type: 8 mm eddy‑current reverse‑mount proximity probe, integral standard tri‑axial coaxial cable, ClickLoc gold‑plated miniature coaxial connector
• Mounting: 3/8‑24 UNF male thread; reverse‑through‑housing mounting configuration; overall case length 120 mm; wrench‑flat for torque‑controlled installation through machine casing or mounting sleeve
• Termination: Integral 1‑meter 75‑ohm standard tri‑axial coaxial cable, terminated with ClickLoc male connector for connection to extension cable and proximitor sensor
• Mechanical Construction: Probe tip PPS polymer; probe body AISI‑304 stainless‑steel; Viton sealing components; passive coil‑insulator assembly with no on‑board PCB
• Environmental Ratings: Probe operating temperature −35 °C ~ +177 °C; storage −40 °C ~ +185 °C; relative humidity 5‑95 % non‑condensing; vibration performance complies with API‑670 rotating‑machinery transducer standard
• Electrical Characteristics: Nominal sensitivity 7.87 V/mm (200 mV/mil); linear measurement range 0.25 mm‑2.25 mm; frequency response DC‑10 kHz (−3 dB); minimum flat target diameter 15.2 mm; recommended minimum shaft diameter 50.8 mm. Total transducer‑system length (probe plus extension cable) must strictly match the 3300‑XL proximitor configuration setting. Suffix‑CN denotes China‑market regional documentation and packaging, without international hazardous‑location approvals.

Core Functions

1. Provides non‑contact clearance measurement between probe tip and rotating metallic shaft surface, converting physical shaft‑to‑probe gap into analog voltage signal for radial vibration, shaft run‑out and thrust‑position monitoring. Reverse‑mount design threads backward through machine casing or custom sleeve to place sensing tip inside machine enclosure. Standard tri‑axial cable construction for general‑purpose machine compartment deployment.
2. Deployed on steam‑turbines, gas‑turbines, centrifugal compressors and other critical rotating‑machinery for dynamic vibration amplitude and static thrust‑position acquisition, supporting machinery protection and condition‑diagnosis. 1 m integral standard cable suits moderate‑distance routing inside machine housings under normal‑stress environments. CN variant is supplied with Chinese‑market‑oriented documentation and packaging.
3. Requires complete matched transducer chain: probe + extension cable + 3300‑XL proximitor sensor. Total system length must strictly conform to proximitor calibration setting. Mismatched cable length will degrade sensitivity and linear‑range performance.
4. Commissioning static gap shall be set near mid‑linear‑range (approx. 1.27 mm / 50 mil, corresponding to −10 Vdc gap voltage). Maintain physical separation between adjacent probe tips to avoid cross‑talk interference.
5. Widely used in power‑generation, petrochemical and oil‑gas industrial sites. Distinguished by ordering suffix codes:‑02‑12‑10‑02‑CN defines reverse‑mount 8 mm probe, 120 mm case length, 1 m standard tri‑axial cable, ClickLoc connector, 3/8‑24 UNF thread, China‑regional variant. Replacement of probe, cable or proximitor demands full gap calibration and linearity verification.

Installation Requirements

1. Mounting requirement: Install probe in reverse‑mount orientation passing through machine casing or dedicated mounting sleeve. Apply specified torque for 3/8‑24 UNF thread; avoid over‑torque to prevent thread deformation and internal coil damage. Reserve sufficient clearance between probe tip and rotating shaft to eliminate rub risk during machine transient operating conditions. Avoid applying bending stress to the probe body during installation.
2. Cable handling rule: Minimum cable bend radius 25.4 mm; prohibit sharp bends, pinching, crushing or tensile pulling on standard tri‑axial coaxial cable. Tighten ClickLoc connector finger‑tight plus maximum 1/8‑turn; over‑torque will damage gold‑plated contact pins.
3. Field‑wiring specification enforcement: Route probe coaxial cable separately from high‑voltage power and large‑current motor cables to suppress electromagnetic interference. Implement single‑point shield‑grounding at proximitor‑sensor end to prevent ground‑loop noise. Verify total system length (probe integral cable plus extension cable) matches proximitor configuration setting.
4. Environmental control: Prevent cable exposure to excessive corrosive chemical spray and hot‑spots exceeding rated temperature range. Outer‑jacket mechanical abrasion will result in signal drift or intermittent measurement faults. This standard cable version is not recommended for locations with persistent heavy‑oil mist and fluid splashing; FluidLoc cable variant shall be selected for such conditions.
5. Pre‑installation visual inspection: Inspect probe tip for chipping or cracking, threaded body for thread damage, cable‑to‑probe junction for wear, connector pins for bending or contamination before commissioning. After mechanical mounting, measure static gap voltage to confirm probe operates within valid linear working range.
6. Part‑number cross‑version distinction: 330105‑02‑12‑10‑02‑CN is reverse‑mount standard‑cable variant with 120 mm housing, 3/8‑24 UNF thread and 1 m integral cable for Chinese market, without hazardous‑area certifications. Standard forward‑mount probes cannot directly substitute reverse‑mount applications. Variants with different thread type, case length, cable length, cable construction and certification suffix cannot directly substitute; replacement requires re‑verification of total system length and gap‑voltage calibration.

Common Failure Modes

‑ Standard cable‑junction degradation, internal coaxial conductor micro‑fracture: intermittent gap‑voltage drift, noisy vibration readings, sporadic signal drop‑out. ‑ Probe‑body over‑torque or bending during reverse‑mount installation: internal coil displacement, degraded linear performance, permanent measurement offset. ‑ Probe‑tip mechanical impact or crack: degraded linear performance, permanent measurement offset. ‑ ClickLoc connector pin contamination or over‑torque damage: unstable signal connection, high‑frequency noise superimposed on vibration waveform. ‑ Long‑term over‑temperature exposure: internal coil insulation degradation, permanent sensitivity shift. ‑ Shaft‑to‑probe rub due to insufficient installation clearance: physical destruction of probe tip and coil assembly, complete loss of measurement signal.