Excellent PLC
Product Overview
The Bently Nevada 330850-91-00 is part of the 3300 XL 25 mm Proximity Transducer System. Designed to monitor differential expansion (DE) in steam turbine generators, it provides a precise, linear output of 0.787 V/mm across a 12.7 mm range. The system includes a proximity probe, extension cable, and Proximitor Sensor, making it ideal for harsh high-temperature environments.
Applications
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Steam turbine differential expansion monitoring
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Rotor/stator axial growth detection
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DE collar or ramp-based measurements
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Mid-size to large generator installations
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Machinery condition monitoring in power and process industries
Advantages
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High linearity (12.7 mm) with 0.787 V/mm scale factor
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Operates in temperatures up to 200 °C (probe)
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Moisture-resistant FluidLoc cable and dual-seal design
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Backward compatibility with 7200 and DE Integral systems
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CE, ATEX, IECEx, and CSA certifications
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Flexible mounting (DIN-rail or panel) with compact Proximitor Sensor
Technical Specifications
| Parameter | Specification |
|---|---|
| System Model | 330850-91-00 |
| Linear Range | 12.7 mm (500 mils) |
| Scale Factor | 0.787 V/mm (20 mV/mil) |
| Output | -1.5 to -11.5 Vdc |
| Power Supply | -17.5 Vdc to -26 Vdc @ 12 mA |
| Target Size (Min.) | 61 mm (2.4 in) diameter |
| Frequency Response | 0–2.7 kHz |
| Operating Temp (Probe) | -35°C to +200°C (short-term to 250°C) |
| Operating Temp (Proximitor) | -51°C to +100°C |
| Humidity | 100% condensing (non-submersible) |
| Probe Tip Material | PEEK |
| Probe Case Material | AISI 304 SST |
| Proximitor Sensor Material | A380 Aluminum |
| Cable Type | FluidLoc PFA-insulated triaxial, 75Ω |
| System Length | 9.0 meters |
| Total Weight | 0.255 kg |
Frequently Asked Questions (FAQ)
Q1: What is the primary function of the 330850-91-00 sensor?
A1: It monitors differential expansion in steam turbines by measuring the relative axial movement between the rotor and stator.
Q2: What is the linear measurement range of this system?
A2: The system provides a linear measurement range of 12.7 mm (500 mils).
Q3: Can it be used in high-temperature environments?
A3: Yes, the probe operates up to 200 °C continuously and 250 °C intermittently.
Q4: Is the 330850-91-00 backward compatible?
A4: Yes, it replaces 7200 and DE Integral 25 mm transducers without changes to monitor configuration.
Q5: What output does the Proximitor Sensor provide?
A5: It provides a voltage output proportional to the shaft movement, typically -1.5 to -11.5 Vdc.
Q6: Does it require special mounting tools?
A6: No, the SpringLoc terminal strips allow tool-free installation.
Q7: How is moisture prevented from entering the probe?
A7: The system uses dual seals and FluidLoc cable to block moisture ingress.
Q8: What material is the probe tip made of?
A8: The tip is made of PEEK, a high-performance plastic with excellent thermal resistance.
Q9: What certifications does the product have?
A9: It complies with CE, RoHS, ATEX, IECEx, CSA/NRTL/C standards.
Q10: Can it be installed in hazardous areas?
A10: Yes, it supports Zone 0/Zone 2 hazardous area installations with appropriate barriers.
Related Models from the Same Series
| Model | Description | System Length | Weight |
|---|---|---|---|
| 330850-51-00 | 3300 XL 25 mm Proximitor, DIN mount | 5.0 m | 0.230 kg |
| 330850-90-00 | 3300 XL 25 mm Proximitor, panel mount | 9.0 m | 0.255 kg |
| 330851-01-000-020-10 | 25 mm Probe, 1¼-12 thread, standard config | 1.0 m | 0.230 kg |
| 330851-02-000-080-10 | 25 mm Probe, M30x2 thread, armored, extended | 8.0 m | 0.620 kg |
| 330854-040-24-00 | Extension Cable, 4.0 m, FluidLoc, high-temp | 4.0 m | 0.180 kg |
| 330853-01-01 | Short sliding bracket, 1¼-12 adapter | N/A | 0.580 kg |
Popular Bently Nevada Models
| Model | Description | Application | Weight |
|---|---|---|---|
| 3300XL-NSv | Narrow range proximity system | Small radial clearance | 0.150 kg |
| 330104-00-06-10-11-00 | 8 mm XL probe with standard cable | General vibration | 0.200 kg |
| 330130-045-00-00 | 3300 XL Proximitor Sensor for 5 m system | Standard probe system | 0.200 kg |
| 330180-91-CN | Proximitor Sensor, Chinese standard variant | Localized compliance | 0.255 kg |
| 330730-040-00-00 | Extension cable, 4.0 m, armored | High EMI/RFI environments | 0.200 kg |
| 3500/42M-01-00 | Proximitor Seismic Monitor | Machinery protection | 0.350 kg |
