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Key Technical Specifications
| Parameter | Specification |
|---|---|
| Probe Tip Diameter | 8 mm |
| Total System Length | 5.0 meters (16.4 feet) |
| Configuration | Integrated (Probe, Cable, Proximitor) |
| Power Supply | -24 V DC (Nominal) |
| Operating Range | -2 V to -18 V DC output |
| Sensitivity | 200 mV/mil (7.87 V/mm) ±5% |
| Linear Range | 80 mils (2.0 mm) minimum |
| Resolution | < 0.01 mil (0.25 µm) |
| Frequency Response | 0 to 10 kHz (-3 dB) |
| Operating Temp (Probe) | -51°C to +177°C (-60°F to +350°F) |
| Operating Temp (Cable) | -51°C to +150°C (-60°F to +302°F) |
| Housing Material | PEEK (Probe), Stainless Steel (Tip) |
| Cable Type | Fluoropolymer insulated, shielded |
| Connector | ClickLoc® or standard Bently connector (verify suffix) |
| Certification | CE, CSA, ATEX (Zone 2 depending on config) |
Product Introduction
The Bently Nevada 330130-080-00-00 is a complete 8mm proximity transducer system designed for monitoring radial vibration and axial position on large turbomachinery. This integrated unit combines the probe tip, extension cable, and front-end oscillator/demodulator into a single assembly, eliminating connection points that often introduce noise or signal loss in split systems.
This specific 5-meter configuration allows for flexible routing from the machine casing to the junction box or rack without requiring additional extension cables, which can degrade high-frequency response. Field performance data shows this model maintains linearity within 1% over an 80-mil range even at temperatures exceeding 150°C, making it suitable for steam turbine and compressor applications where thermal expansion is significant. The “00” suffix typically denotes a standard calibration curve compatible with most 3500 and 3701 monitor racks.
Installation & Configuration Guide
Installation & Configuration GuidePreparation (10 min)
- Ensure the machine is shut down and locked out (LOTO).
- Verify the target mounting hole is clean, deburred, and perpendicular to the shaft surface. A tilted probe causes cosine error.
- Check the probe tip for scratches. Even a 0.001″ nick can distort the magnetic field.
Removal (5–10 min)
- If replacing an existing sensor, mark the cable route and connector orientation.
- Disconnect the BNC or ClickLoc connector at the junction box.
- Unscrew the probe from the mounting bracket. Note the number of turns required for removal to estimate re-installation depth.
- Self-correction: Do not pull on the cable to remove the probe; always grip the hex nut on the probe body. Pulling the cable can separate the internal connections.
Installation (10 min)
- Apply a small amount of high-temperature anti-seize compound to the probe threads (avoid the tip!).
- Screw the probe into the bracket until the tip touches the shaft.
- Back the probe out to the approximate gap voltage. For 200 mV/mil sensors, target -10 V DC (-24 V supply).
- Tighten the locknut while holding the probe body stationary. Rotating the probe during tightening changes the gap setting.
- Route the cable away from high-voltage lines and VFD outputs. Maintain a bend radius of no less than 1 inch to prevent shield damage.
Power-On & Test (10 min)
- Connect the sensor to the monitor rack or handheld voltmeter.
- Apply -24 V DC power. Measure the DC bias voltage at the output.
- Target Gap Voltage: -10.0 V DC ± 0.5 V.
- Perform a “bump test”: Gently push the shaft towards the probe. The voltage should become more negative (e.g., -11 V). If it goes positive, the probe is too far away or wired incorrectly.
- Verify the monitor displays a valid gap value and no “Probe Fault” alarms.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| Output = -24 V DC | Open circuit or probe disconnected. | Check continuity of the cable. Inspect the connector pins for corrosion or bending. |
| Output = 0 V DC | Short circuit or power failure. | Measure supply voltage at the junction box. Check for shorts between center conductor and shield. |
| Unstable Reading | Loose ground or electrical noise. | Verify the probe shield is grounded at one end only (usually the monitor side). Check for VFD interference. |
| Non-linear Response | Probe tip damaged or target material wrong. | Inspect tip under magnification. Confirm shaft material is steel (4140/4340). Aluminum requires different calibration. |
| Gap Voltage Drifts | Thermal expansion or mechanical loosening. | Re-check gap voltage after machine reaches operating temperature. Tighten locknut if loose. |
Dimensions, Mounting & Wiring Notes
- Probe Dimensions: 8mm diameter thread (typically M10x1 or 3/8-24 UNF, verify specific order code). Length varies by model; standard is ~75mm threaded section.
- Cable Length: Total system length is 5.0 meters. The probe integral cable is usually 1 meter, with a 4-meter extension fused internally.
- Mounting Method: Requires a threaded bracket or clamp-style holder. Use two locknuts to secure the position.
- Terminal Notes: Connector type depends on the specific dash number (often BNC or ClickLoc). Ensure the mating connector clicks firmly.
- Warning: The probe tip is fragile. Never let the tip hit the shaft during installation. A hard impact can crack the ceramic coil form, causing immediate failure.
FAQ
FAQQ: Can I extend the 330130-080-00-00 cable if 5 meters isn’t enough?
A: No. This is an integrated system calibrated as a single unit. Adding an external extension cable changes the capacitance and ruins the calibration linearity. You must order a longer system model (e.g., 9m or 10m) if distance is an issue.
A: No. This is an integrated system calibrated as a single unit. Adding an external extension cable changes the capacitance and ruins the calibration linearity. You must order a longer system model (e.g., 9m or 10m) if distance is an issue.
Q: My monitor reads “Fault” even though the voltage is -10V. Why?
A: The 3500 rack checks for AC impedance. If the probe coil is open or shorted internally, the DC voltage might look okay (due to leakage), but the oscillator won’t sustain. Swap with a known good probe to isolate the issue.
A: The 3500 rack checks for AC impedance. If the probe coil is open or shorted internally, the DC voltage might look okay (due to leakage), but the oscillator won’t sustain. Swap with a known good probe to isolate the issue.
Q: Is this probe compatible with aluminum shafts?
A: Physically it mounts fine, but the sensitivity will be wrong. Bently probes are calibrated for 4140 steel. On aluminum, the sensitivity drops significantly (approx. 120 mV/mil), causing the monitor to under-read vibration by nearly 40%. Do not use on non-ferrous targets without re-calibration.
A: Physically it mounts fine, but the sensitivity will be wrong. Bently probes are calibrated for 4140 steel. On aluminum, the sensitivity drops significantly (approx. 120 mV/mil), causing the monitor to under-read vibration by nearly 40%. Do not use on non-ferrous targets without re-calibration.
Q: I found an old one in the spare parts bin. Is it still good?
A: If the packaging was sealed and the tip is pristine, it’s likely fine. However, if the cable has been bent sharply or stored in extreme heat, the dielectric properties may have shifted. We recommend a quick linearity check on a calibration kit before installing it on a critical turbine.
A: If the packaging was sealed and the tip is pristine, it’s likely fine. However, if the cable has been bent sharply or stored in extreme heat, the dielectric properties may have shifted. We recommend a quick linearity check on a calibration kit before installing it on a critical turbine.
Q: What’s the difference between the -00-00 and -01-00 suffixes?
A: Suffixes often denote connector types (ClickLoc vs. BNC) or specific calibration curves for unusual materials. The -00-00 is the industry standard for general steel shafts with standard connectors. Always cross-reference your existing system’s part number to ensure interchangeability.
A: Suffixes often denote connector types (ClickLoc vs. BNC) or specific calibration curves for unusual materials. The -00-00 is the industry standard for general steel shafts with standard connectors. Always cross-reference your existing system’s part number to ensure interchangeability.
Q: How do I know if the probe is “touched” to the shaft during setup?
A: When the tip touches the shaft, the output voltage will saturate near 0 V or fluctuate wildly. Back the probe out slowly until the voltage stabilizes in the -2 V to -4 V range, then continue to the target -10 V. Listen for a faint scraping sound—stop immediately if you hear it.
A: When the tip touches the shaft, the output voltage will saturate near 0 V or fluctuate wildly. Back the probe out slowly until the voltage stabilizes in the -2 V to -4 V range, then continue to the target -10 V. Listen for a faint scraping sound—stop immediately if you hear it.
