Bently Nevada 24765-01-01 Case Expansion Transducer Assembly

Bently Nevada 24765 - 01 - 01 The casing expansion sensor assembly is a device used to measure the thermal expansion of large turbine casings. It is an important displacement measurement component in turbine monitoring instruments (TSI). The following is a detailed introduction:

Working principle: It uses linear variable differential transformer (LVDT) technology. The LVDT has a connecting rod connected to the machine. When the casing expands, the connecting rod moves inside the LVDT, causing the LVDT signal to change. The signal is conditioned and transmitted to the monitor for display and alarm.

Structural composition: It consists of an LVDT and a weatherproof protective housing that installs and protects it.

Technical parameters

Electrical parameters: The range is 25.4mm (1.00in), the scale factor is 0.346V/mm (8.79V/in), the -3dB frequency is 20Hz, the linearity is ±0.5% full scale, and the stability is 0.125% full scale.

Environmental parameters: Operating temperature is -18°C to +71°C (0°F to +160°F), storage temperature is -54°C to +93°C (-65°F to +200°F).

Mechanical parameters: Height is 88.9mm (3.50in), width is 117mm (4.60in), length is 241mm (9.50in), weight is 2.3kg (5.0lbs), thread is 10-32 UNC-2B core end, 10-32 UNC-2A machine end.

Application scenario: Usually installed on the foundation opposite to the fixed end of the turbine casing, providing information about the expansion of the casing relative to the foundation. The casing expansion measurement can help users determine whether the thermal expansion value of the machine exceeds the expected value. It can also be used to determine whether the thermal growth rate of the casing and the rotor is similar during the startup of the machine to avoid friction between the rotating and stationary parts due to different thermal growth rates.

Installation and Use: Case expansion is generally measured using dual sensors side by side. The dual case expansion sensor system can be used with a 3300 or 3500 monitor to provide alarm information for case measurement. The high temperature dual case expansion sensor system is only compatible with the 3500/45 displacement monitor.