The Bently Nevada 330850-51-00 is part of the 3300 XL 25 mm Proximity Transducer System, designed to accurately measure differential expansion (DE) in large steam turbines. It includes a 25 mm proximity probe, a 5-meter extension cable, and the Proximitor Sensor. With an output scale factor of 0.787 V/mm (20 mV/mil), it supports linear measurements up to 12.7 mm (500 mils).

Technical Specifications

Applications

• Steam turbine differential expansion (DE) monitoring

• Shaft movement measurement in power generation

• High-temperature rotating machinery environments

• Redundant DE detection with dual-probe configurations

• Suitable for harsh industrial turbine enclosures

Advantages

• High survivability in extreme environments (up to 250°C)

• Fully backward compatible with 7200 and DE Integral systems

• Moisture protection with dual-sealing and FluidLoc cable

• Fast, tool-free SpringLoc terminal wiring

• Compatible with sliding bracket for precise probe alignment

• Designed for EMI/RFI immunity and CE compliance

FAQs

Q1: What is the maximum linear measurement range?

A1: The linear range is up to 12.7 mm (500 mils).

Q2: Can it be used in high-temperature environments?

A2: Yes, it supports continuous operation at 200°C and short-term peaks up to 250°C.

Q3: Is it compatible with older 7200 series systems?

A3: Yes, it’s designed to replace 7200 25 mm and 35 mm systems with no monitor configuration changes.

Q4: What materials are used in the sensor and probe?

A4: The probe uses AISI 304 stainless steel; the sensor is A380 aluminum.

Q5: What are the output characteristics?

A5: It provides 0.787 V/mm (20 mV/mil), linear from 0.63 mm to 13.33 mm.

Q6: Does it have protection against environmental moisture?

A6: Yes, via a sealed tip and FluidLoc triaxial cable.

Q7: What is the operating temperature range of the Proximitor Sensor?

A7: It operates from -51°C to +100°C.

Q8: Can this model be DIN-mounted?

A8: Yes, the “-51” in the part number specifies DIN mount.

Q9: Are special tools required for installation?

A9: No, SpringLoc terminals allow tool-free installation.

Q10: Is it certified for hazardous environments?

A10: Yes, including CSA, ATEX, and IECEx approvals for Zone 0/Zone 2 installations.