Description

Bently Nevada 24765‑01‑00 DC‑LVDT Case Expansion Transducer Assembly

Technical Specifications

• Product Model: 24765‑01‑00
• Brand: Bently Nevada (Baker Hughes)
• Warranty: One Year
• Input Voltage: DC‑powered LVDT, powered by compatible 3500 / 3300 position monitor module
• Operating Temperature: ‑18 °C ~ +71 °C
• Storage Temperature: ‑54 °C ~ +93 °C
• Response Time:‑3 dB frequency response at 20 Hz
• Protection Class: IP65 environmental‑sealed field‑mount housing
• Accuracy Class: Linear error ≤ ±0.5 % full‑scale
• Output Frequency: DC analog displacement‑proportional voltage output
• Rated Measurement Range: 1.0 inch (25.4 mm) total travel
• Scale Factor: 0.346 V/mm (8.79 V/inch)
• Mechanical Structure: Non‑spring‑return LVDT probe assembly; stainless‑steel housing
• Mounting: Base‑flange mechanical mounting for turbine foundation / casing interface
• Certifications: CE, industrial EMC compliant
• Dimensions: 241 mm × 117 mm × 88.9 mm
• Weight: approx 2.3 kg

Product Overview

The 24765‑01‑00 is a DC‑LVDT case expansion transducer assembly for Bently Nevada machinery protection systems. It measures thermal casing expansion of steam and gas turbines, capturing relative displacement between turbine casing and foundation during startup, load variation and steady‑state operation. The LVDT converts mechanical stroke movement into proportional DC‑voltage signal, feeding displacement data to 3300 or 3500 series position monitor modules. Dual‑transducer installation is widely recommended to detect sliding‑foot jamming and casing distortion risks, helping avoid rotor‑to‑stator rub damage. Rugged sealed stainless‑steel construction delivers stable performance under high‑vibration, heavy‑EMI power‑plant field‑installation environments.

This transducer addresses turbine thermal‑growth monitoring challenges: direct mechanical thermal‑expansion measurement, sealed field‑hardened assembly, standard scale‑factor for easy monitor calibration, drop‑in spare‑part compatibility for legacy turbine TSI retrofit‑maintenance projects. Turbomachinery condition‑monitoring engineers, power‑plant maintenance technicians and retrofit integrators benefit most. Typical applications: combined‑cycle power‑plant steam‑turbine / gas‑turbine casing thermal expansion monitoring.

Key Application Notes

‑Field‑mount transducer unit; cannot operate standalone. Requires matching Bently Nevada 3500 or 3300 position monitor module and dedicated signal cable. ‑‑01‑00 = 1‑inch travel, non‑spring‑return variant; other 24765 range variants are not interchangeable without full part‑number matching. ‑Mechanical installation must comply with turbine OEM mounting‑gap and stroke‑limit requirements to prevent probe over‑travel damage. ‑Original OEM production discontinued; aftermarket surplus/refurbished spare parts circulate for legacy‑turbine TSI system maintenance. ‑Avoid excessive mechanical shock during installation and service. ‑Follow Bently Nevada 24765‑series hardware manual for mechanical mounting, cable‑length matching and monitor‑scale‑factor configuration.