Description
Product Core Brief
- Model: 18745-04
- Brand: BENTLY NEVADA
- Series: 7200 Proximity Transducer
- Core Function: Measures dynamic shaft displacement and vibration for rotating machinery.
- Product Type: Proximity Probe and Extension Cable System
- Key Specs: 5/8 Inch Diameter | API 670 Compliant | Eddy Current Technology
- ⚠️ EOL — limited stock remaining
BENTLY 18745-04
Product Introduction
The BENTLY 18745-04 is a proximity probe and extension cable system designed for continuous machinery monitoring. It detects shaft displacement and vibration parameters reliably.
This unit features a standard 5/8 inch diameter, distinguishing it from smaller 8 mm variants used in tight spaces. It operates across a wide temperature range, typically -40°C to 177°C, ensuring reliable data in harsh industrial environments.
Key Technical Specifications
- Probe Diameter: 5/8 Inch (15.88 mm)
- Sensitivity: 7.87 mV/µm (200 mV/mil) nominal
- Measurement Range: Up to 2.0 mm (80 mils) linear
- Frequency Response: 0 to 10 kHz (-3 dB)
- Operating Temperature: -40°C to 177°C
- Cable Type: Integral or extension cable system
- Compliance: API 670, ISO 10817-1
- Supply Voltage: -24 V DC nominal
- Output: Buffered DC voltage + AC raw signal
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: We check source traceability and verify serial numbers against anti-counterfeit databases. Visual inspection confirms no physical damage or connector corrosion.
- Live Functional Test: Power-on self-checks validate basic operation. We run continuous load tests exceeding 24 hours with temperature logging to ensure stability.
- Electrical Parameter Test: Insulation resistance is verified using a 500 V Megger, requiring >10 MΩ. Ground continuity is also strictly checked.
- Firmware Verification: We read and record internal firmware versions. DIP switch and jumper settings are photographed for future reference.
- Final QC & Packaging: The unit is sealed in an anti-static bag. A QC Passed label with the inspection date is applied before shipping.
BENTLY 18745-04
Replacement Pitfall Guide
❗ Firmware Mismatch: Newer proximity systems may have different linearization curves. Verify compatibility with your existing monitor module before swapping.
❗ DIP Switch / Jumper Misconfiguration: Factory defaults rarely match field settings. Always check bus termination resistors and sensitivity switches on the associated transmitter.
❗ Terminal / Cable Incompatibility: Pin definitions can change between revisions. Always verify shield grounding at both the probe and monitor ends to prevent noise.
❗ Power Supply Mismatch: Calculate total rack power requirements carefully. Always include a 20% headroom margin for transient loads during startup.
❗ ESD Damage: Use an anti-static mat during installation. Dry environments significantly increase electrostatic discharge risks to sensitive electronics.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
- 18745-04 → 330104 : Needs Adaptation — requires 3300 XL compatible monitor module
- 18745-04 → 18745-03 : Direct — same series, verify cable length
- 18745-04 → 330100 : Incompatible — different diameter and sensitivity
- Sensitivity Verification: 7.87 mV/µm ± 5% (calibrated at 25°C)
- Linearity: < 1% over full 80 mil measurement range
- Noise Floor: < 2.0 mV RMS at maximum gain
