Bently Nevada 135613-01-00 Expansion Transducer Assembly

The Bently Nevada 135613-01-00 operates as a rugged, heavy-duty industrial sensor assembly belonging to the High Temperature Case Expansion (HTCE) product line. This hardware asset is utilized to monitor structural thermal growth on large rotating machinery, specifically tracking shell-to-rotor movement and casing expansion variables on steam turbines, gas turbines, and large industrial pumps within Turbine Supervisory Instrumentation (TSI) layouts.

Hardware Specifications

Mechanical Monitoring and TSI Characteristics

The 135613-01-00 transducer converts macro-level mechanical displacement into a highly linear, proportional DC voltage. When a massive steam turbine transitions from cold startup to full running temperatures, the machine casing expands significantly due to thermal stresses.

Because the "00" spring option designates a configuration without a spring return, the internal rod assembly does not rely on a spring-loaded tip riding against a surface. Instead, the 127 mm (5.00 in) rod must be rigidly coupled or mechanically linked directly to the moving component of the turbine structure. As the casing grows or moves, it mechanically shifts the internal DC Linear Variable Differential Transformer (LVDT) core.

The sensor converts this physical stroke across its 25.4 mm range into a steady voltage profile using its $0.20\text{ V/mm}$ scale factor. This real-time positioning loop passes back to a dedicated 3500/45 Position Monitor module, ensuring continuous connection tracking and protection against stress fractures or binding along the structural sliding feet of the machine.

Frequently Asked Questions

Q: What is the primary difference between a case expansion transducer "with" a spring return and this "without spring return" (00) variant?

A: A spring-return transducer relies on internal tension to keep its probe tip compressed against a shifting machinery plate, which is useful for flat-surface touch points. This version without a spring return (Option 00) requires a rigid mechanical pin or clevis connection at the end of the 127 mm rod, forcing it to follow both forward expansion and backward retraction positively.

Q: How is the raw output signal of this transducer calibrated within the 3500 monitoring system?

A: Because the scale factor is precisely set at $0.20\text{ V/mm}$, every 5-volt change in the signal indicates exactly 25.4 mm (1 inch) of total structural displacement. Field engineers map the zero-point voltage (typically center-stroke) in the 3500 Rack Configuration software to establish precise absolute tracking baselines for turbine growth.