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

• Steam turbine differential expansion monitoring

• Rotor/stator axial growth detection

• DE collar or ramp-based measurements

• Mid-size to large generator installations

• Machinery condition monitoring in power and process industries

Advantages

• High linearity (12.7 mm) with 0.787 V/mm scale factor

• Operates in temperatures up to 200 °C (probe)

• Moisture-resistant FluidLoc cable and dual-seal design

• Backward compatibility with 7200 and DE Integral systems

• CE, ATEX, IECEx, and CSA certifications

• Flexible mounting (DIN-rail or panel) with compact Proximitor Sensor

Technical Specifications

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.