135613-03-00 Bently Nevada High Temperature Transducer

Description:

The Bently Nevada 24765-01-01 Vibration Monitoring System is a highly reliable and accurate solution designed for real-time vibration monitoring in industrial environments. It offers precise measurement and analysis capabilities, enabling effective predictive maintenance to reduce downtime and improve operational efficiency.

Thermal Case Growth Measurements in Large Turbines
An important position measurement in Turbine Supervisory Instrumentation (TSI) is case expansion. Case expansion (sometimes referred to as shell expansion) is the thermal growth of the machine case as it expands during machine startup and on-line operations.  The case expansion transducer system is typically mounted on the foundation at the opposite end from where the turbine casing is attached to the foundation and provides information about the growth of the machine case relative to the foundation.

Case expansion is a parameter that you should use a dual transducer arrangement to measure.  This arrangement provides information about the position of the sliding feet on the machine case.  A condition that obstructs or jams one foot could distort the case and damage the machine.  The dual case expansion transducer configuration in conjunction with the 3300 or 3500 monitors provides an alarm for this condition.  The high temperature dual case expansion transducer configuration is compatible only with the 3500/45 Position Monitor.

Case expansion measurements also enable you to determine whether machine conditions are exceeding expected temperature growth differentials.  This is primarily a startup parameter that determines whether the machine casing and rotor grow thermally at nearly the same rate. Different rates of thermal growth can cause the rotating and stationary parts of the machine to rub.

The case expansion transducer assembly consists of a linear variable differential transformer (LVDT), which is housed in a weatherproof, protective enclosure.

Scale Factor
135613-01 and -11 0.20 V/mm (5.0 V/in)
135613-02 and -12 0.10 V/mm (2.5 V/in)
135613-03 and -13 0.049 V/mm (1.25 V/in)
Linear Range
135613-01 and -11 25.4 mm (1.00 in)
135613-02 and -12 50.8 mm (2.00 in)
135613-03 and -13 101.6 mm (4.00 in)
-3 dB Frequency
135613-01 and -11 200 Hz (typical)
135613-02 and -12 200 Hz (typical)
135613-03 and -13 200 Hz (typical)
Stability 0.125% full-scale
Non-Linearity Less than 0.25% full-scale
Temperature Coefficient   0.05%/°C (0.028%/°F) maximum

Frequently Asked Questions:

1.How a Case Expansion Transducer 135613 dc LVDT 24765 dc and LVDT Assembly Works?
The case expansion transducer system uses the LVDT to measure the machine case thermal growth.

A rod on the LVDT connects to the machine.  As the machine case grows, the rod moves inside the LVDT and changes the signal in the LVDT.  The transducer electronically conditions the signal and outputs it to a monitor for display and alarms.

The High Temperature Case Expansion Transducer is designed to meet TYPE 4 requirements.

2.What is the payment term?
Only wire transfer

3.When does the warranty period start?
One year from the time the client receives the goods.