Bently Nevada Case Expansion and Valve Position Transducer Systems
GE Bently Nevada offers a very wide variety of vibration, position, speed, pressure and power sensors and transmitters, each designed to handle the rigors of industrial environments and many capable of being installed in hazardous areas when appropriate I.S. barriers, galvanic isolation, or other means are used.
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.
Features and Benefits
• To determine whether machine conditions are exceeding expected
temperature growth differentials.
• To determines whether the machine casing and rotor grow thermally at
nearly the same rate.
The 3300 XL Rotary Position Transducer (RPT) measures angular
rotation. Its most common use is for measuring valve position on steam
turbines allowing for:
• Utilizing valve position information to adjust inlet valves,
• Determining operating efficiency and measuring the load of the turbine.
The 18639 Valve Position Transducer measures the opening of governor valves on the steam turbine so you can
• Monitor and adjust the amount of steam that flows to the individual
valves in the group to provide the highest machine operating efficiency.
The 3300 XL Rotary Position Transducer (RPT) measures angular rotation. Its most common use is for measuring valve position on steam turbines. Valve position information is utilized to adjust inlet valves, determine operating efficiency and measure the load of the turbine.
The 3300 XL RPT attaches to the end of a steam valve control shaft using a flexible coupling (not provided). The 3300 XL Rotary Position Transducer consists of a housing, cylinder and shaft, conduit fitting and a non-contacting eddy-current 3300 XL Proximity Transducer System. The 3300 XL probe views the precisely machined cylinder. As the steam turbine control valve opens or closes, the steam valve control shaft and the 3300 XL RPT cylinder rotate. This causes the gap voltage reading of the Proximity Transducer System to change. The change in the gap voltage is proportional to the change in valve opening. The 3300 XL RPT is available in three different rotational ranges to optimize its performance - 100 degrees, 200 degrees, or 300 degrees. It is compatible with our 3500/45 Position Monitors. The 3500/45 monitor and 3300 XL RPT utilize the advanced "Transducer OK" checking inherent in Bently Nevada eddy current proximity transducer measurements.
Bently Nevada Case Expansion and Valve Position Transducer Systems
Bently Nevada CASE EXPANSION AND VALVE POSITION TRANSDUCER
BENTLY NEVADA SCOUT
Model
Requires -17.5 Vdc to -26 Vdcwithout barriers at 12 mA maximum consumption.
Power
<
>
Less than 2 mV change in output
voltage per volt change in input
voltage.
Supply Sensitivity:
50Ω
Output resistance
140 + 8 mV/degrees of shaft rotation.
Average Scale Factor
100° Ramp:
70 ± 4 mV/degrees of shaft rotation.
Average Scale Factor
200° Ramp:
50 ± 3 mV/degrees of shaft rotation.
Average Scale Factor
300° Ramp:
69.9 pF/m (21.3 pF/ft) typical
Extension cable capacitance
0.2 to 1.5 mm2 (16 to 24 AWG) [0.25 to 0.75 mm2 (18 to 23 AWG) with ferrules]. Recommend using
three-conductor shielded triad cable. Maximum length of 305
Field wiring
10 cm to 2 m nominal
Laser sensor range
Product Info
Documentation
Case Studies
Training & Support
Video
How does it work?
The 3300 XL Rotary Position Transducer (RPT) measures angular rotation. Its most common use is for measuring valve position on steam turbines. Valve position information is utilized to adjust inlet valves, determine operating efficiency and measure the load of the turbine.
What problems does it solve?
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