Product Introduction
The Bently Nevada 21504-000-008-05-02 is an 8 mm Standard Mount Proximity Probe from the 7200 Series. It is a non‑contact eddy‑current probe designed for precise measurement of static and dynamic positions of conductive targets, primarily rotating machinery shafts. When used with a compatible extension cable and a 7200 Series proximitor (driver/demodulator), it forms a complete proximity transducer system that outputs a linear voltage proportional to the gap between the probe tip and the shaft surface.
The part number breakdown is as follows:
21504 – 7200 Series 8 mm proximity probe
000 – Unthreaded length: 0.0 mm
008 – Overall case length: 80 mm (8.0 cm / 3.15 in)
05 – Total probe system length (probe plus integral cable): 0.5 m (20 in)
02 – Connector type: miniature male coaxial (Mini‑Type)
The probe features a rugged Polyphenylene Sulfide (PPS) tip and housing, offering excellent resistance to chemicals, abrasion, and high temperatures. It meets API 670 requirements for machinery protection systems.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 21504-000-008-05-02 |
| Product Type | 7200 Series 8 mm Proximity Probe (standard mount) |
| Probe Tip Diameter | 8 mm (0.315 in) |
| Unthreaded Length | 0.0 mm |
| Overall Case Length | 80 mm (3.15 in) |
| Total System Length (probe + integral cable) | 0.5 m (20 in) |
| Connector Type | Miniature male coaxial (Mini‑Type) |
| Dimensions (probe body only) | Diameter: 8 mm (0.315 in); Length: 80 mm (3.15 in) |
| Weight (probe + 0.5 m cable) | Approx. 0.23 kg (0.51 lb) |
| Operating Temperature (tip & cable) | –51 °C to +177 °C (–60 °F to +351 °F) |
| Storage Temperature | –51 °C to +177 °C (–60 °F to +351 °F) |
| Linear Range | 2.0 mm (80 mils) |
| Material (housing / tip) | Polyphenylene Sulfide (PPS) |
| Thread Size | 3/8‑24 UNF |
| Output scaling (with 7200 proximitor) | 200 mV/mil (8 V/mm) |
| Frequency response (system) | DC to 10 kHz |
| Compliance | API 670 |
Application Scenarios
Radial Vibration Monitoring – Mounted on steam turbines, gas turbines, centrifugal compressors, and large motors to measure shaft‑relative vibration, detecting imbalance, misalignment, and bearing wear.
Axial (Thrust) Position Measurement – Used on pumps, compressors, and turbines to monitor rotor axial displacement, preventing thrust bearing overload and rotor‑stator rub.
Shaft Eccentricity & Runout – Provides bow measurement during startup and coast‑down of large rotating equipment (e.g., generators, steam turbines).
Keyphasor / Speed Reference – Supplies a once‑per‑revolution pulse for phase reference, enabling Bode plots, orbit analysis, and overspeed protection.
Reciprocating Compressor Rod Position – Tracks piston rod radial movement to detect rider band wear or cylinder liner issues.
General Industrial Machinery – Protects fans, blowers, paper mill rolls, and mining equipment where non‑contact shaft monitoring is required in harsh environments (e.g., high temperature, dirt, oil).
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
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On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
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