Description
At-A-Glance Executive Brief
- Model: 21508-02-12-10-02
- Brand: Bently Nevada
- Part Type: 8mm Proximity Probe (Reverse Mount)
- System Compatibility: 7200 Series Transducer Systems
- Lifecycle Status: Legacy Hardware / Supported via New Surplus & Refurbished Channels
Technical Introduction
Incorrect mechanical mounting or degraded gap voltage responses in legacy turbine vibration loops lead to false machine trips or unmonitored shaft eccentricity. Field retrofits require strict dimensional adherence to maintain proper linear measuring ranges without mechanical binding. The Bently Nevada 21508-02-12-10-02 delivers a precision-engineered 8mm reverse-mount proximity sensor built to interface directly with existing 7200 series monitoring infrastructure and preserve established API 670 compliance.
Core Technical Specifications
- Manufacturer: Bently Nevada (Baker Hughes / GE)
- Series: 7200 Series (5mm / 8mm)
- Probe Configuration: Reverse Mount
- Case Length: 12.0 inches
- Integral Cable Length: 1.0 meter (39 inches)
- Connector Type: Miniature male coaxial connector
- Frequency Response: 0 Hz to 10 kHz
- Linear Measuring Range: 80 mils (2.0 mm)
Field Engineer’s Tech Notes
- Reverse Mount Threading and Clearance: Because this is a reverse-mount configuration, verify the thread pitch and unthreaded length dimensions relative to the mounting bracket inside the machine housing to avoid damaging the probe tip during installation or gapping.
- System Calibration Match: Swapping a 7200-series probe requires checking that the combined electrical length of the integral probe cable and extension cable matches the Proximitor unit’s calibration scale factor (typically 200 mV/mil) to prevent baseline output voltage drift.
Adaptive QA & Testing Protocol
Validating this proximity probe involves executing an electrical insulation resistance check between the center conductor and outer shield, performing a high-frequency coaxial impedance verification, and using a static target simulator to confirm the 200 mV/mil output linearity across the 80-mil measuring span. Calibration data and test verification reports are available upon request prior to warehouse dispatch.
Buyer’s FAQ
- Q: Is this probe compatible with modern 3300 XL Proximitor monitors?
- A: No, the 21508 model belongs strictly to the legacy 7200 series ecosystem and requires matching 7200 series components and monitors for proper operation.
- Q: What condition is the part provided in?
- A: This unit is available in verified New Surplus (NSFP) and fully tested, premium refurbished conditions with standard warranty coverage.
- Q: How fast can this item ship for emergency outage support?
- A: Stocked inventory ships same-day from our US facility to ensure minimal turnaround during unplanned plant outages.
- Q: Are compliance and traceability documents provided?
- A: Yes, inspection sheets and material origin documentation can be requested to satisfy internal QA requirements.
