Bently Nevada 990-04-70-03-05 – Installation & Maintenance Guide for 3300 XL Probes
990-04-70-03-05 Product Introduction
The Bently Nevada 990-04-70-03-05 includes a probe, extension cable, and proximity sensor. Specifically, it works with the 3300 XL series monitor. The system delivers a linear measurement range from 0.25 mm to 2.3 mm. Moreover, it supports a target material of 4140 steel. The probe tip diameter is 8 mm. Furthermore, the system operates at a temperature from -35°C to +85°C. Many engineers choose the Bently Nevada 990-04-70-03-05 for API 670 compliance.
Core Value
This model provides reliable shaft vibration data. Firstly, it prevents unplanned downtime. Secondly, the system reduces bearing damage risks. In addition, it supports real-time machine protection. The Bently Nevada 990-04-70-03-05 also offers high noise immunity. Therefore, it performs well in electrically noisy plants. Besides, the probe uses a short cable length of 5.0 meters. This design simplifies retrofitting. Meanwhile, the linear output ensures accurate trip decisions.
Technical Insights
The Bently Nevada 990-04-70-03-05 uses eddy current principle. Specifically, it measures displacement without contact. The scale factor is 7.87 V/mm. Furthermore, the nominal gap voltage sits at -10 Vdc. For correct operation, you must set the target gap to 0.64 mm. Additionally, the system requires a power supply of -17.5 to -26 Vdc. The probe material is PPS plastic. Also, the connector type is a 3-pin micro-dot. For integration, always match the extension cable type. Besides, avoid running cables near high-voltage lines.
Installation & Maintenance
Start with a clean mounting surface. Firstly, install the probe perpendicular to the target shaft. Use a micrometer to set the initial gap. Secondly, lock the probe with the supplied nut. Torque it to 3.4 Nm. Then, connect the extension cable. Verify continuity with a multimeter. Moreover, check the gap voltage on the monitor. It should read -10 Vdc ±5%. For maintenance, inspect the probe tip monthly. Remove any metal debris. Furthermore, recalibrate the Bently Nevada 990-04-70-03-05 every 12 months. Use a calibrated target and a signal simulator.
Buyer’s Guide FAQ
Q1: What machines use the Bently Nevada 990-04-70-03-05?
A1: This probe fits steam turbines, gas compressors, and large pumps. It monitors radial vibration and thrust position.
Q2: Can I replace an older 3300 probe with the Bently Nevada 990-04-70-03-05?
A2: Yes, but check the extension cable compatibility. Use the same thread size and cable length.
Q3: What is the maximum cable length for this model?
A3: The total system length reaches 305 meters. Specifically, use a 5.0 m probe cable plus extension cables.
Q4: How do I test the Bently Nevada 990-04-70-03-05 offline?
A4: Connect it to a 3300 XL monitor. Then, move a test target across the range. Verify output voltage changes linearly.
Q5: Does this probe work in hazardous areas?
A5: The Bently Nevada 990-04-70-03-05 has no internal active components. Therefore, it accepts passive use in Class I, Div 2 areas. Always confirm with local codes.
