24765-02-00 High Temperature Dual Transducer Case Expansion Transducer with Weatherproof LVDT Assembly for Thermal Growth Measurement
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Detailed Product Description
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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. How a Case Expansion Transducer 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. Specifications 24765 dc LVDT Assembly Electrical Scale Factor 24765-01: 0.346 V/mm (8.79 V/in). 24765-02: 0.404 V/mm (10.25 V/in). 24765-03: 0.143 V/mm (3.63 V/in). Linear Range 24765-01: 25.4 mm (1.00 in). 24765-02: 50.8 mm (2.00 in). 24765-03: 101.6 mm (4.00 in). -3 dB Frequency 24765-01: 20 Hz. 24765-02: 15 Hz. 24765-03: 10 Hz. Linearity ±0.5% full-range. Stability 0.125% full-scale. Environmental Limits Operating Temperature -18 C to +71 C (0 F to +160 F). Storage Temperature -54 C to +93 C (-65 F to +200 F). Mechanical Height 88.9 mm (3.50 in). Width 117 mm (4.60 in). Length 24765-01 and -02: 241 mm (9.50 in). 24765-03: 328 mm (12.90 in). Weight 24765-01 and - 02: 2.3 kg (5.0 lbs) 24765-03: 2.7 kg (6.0 lbs) Thread 6-40 UNF-2B core end 1/4-20 UNC-2A machine end. Compliance and Certifications EMC Standards: EN 61000-6-2 Immunity for Industrial Environments EN 61000-6-4 Emissions for Industrial Environments 135613 dc LVDT High Temperature Case Expansion Transducer System Electrical 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). 24765 DC LVDT Assembly Specifications
Ordering Information Case Expansion Transducer Assembly (dc) 24765-AXX-BXX A: Linear Range Option 0 1 25.4 mm (1.00 in) 0 2 50.8 mm (2.00 in) 0 3 101.6 mm (4.00 in) B: Spring Option 0 0 Without spring return 0 1 With spring return 135613 DC LVDT High Temperature Case Expansion Transducer System
135613 DC LVDT Dimensions
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| Product Tags: high temperature expansion transducer weatherproof LVDT assembly thermal growth measurement transducer |
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