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330850-91-05

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The 330850-91-05 is a 9.0-meter (29.5-foot) long, DIN-mount 3300 XL 25 mm Proximity Transducer System. It is engineered for large-scale differential expansion (DE) measurement.
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Technical specifications for 330850-91-05

  • Manufacturer:
    Bently Nevada
  • Part Number:
    330850-91-05
  • Product Family:
    3300 XL 25mm Proximity Transducer System
  • Product Type:
    3300 XL 25 mm Proximitor Sensor
  • System Length:
    9.0 metres (29.5 feet) total
  • Mounting Style:
    DIN mount (Proximitor Sensor)
  • Probe Diameter:
    25 mm
  • Output Sensitivity:
    0.787 V/mm (20 mV/mil)
  • Linear Range:
    12.7 mm (500 mils)
  • Standard Gap:
    7.0 mm (275 mils)
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    8.8x3.5x7cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.
Description
The 330850-91-05 represents a complete 3300 XL 25 mm Proximity Transducer System configured for critical monitoring applications requiring a very large measurement range. This system is supplied with a total length of 9.0 metres (29.5 feet) and is designed for DIN-rail mounting of the Proximitor Sensor, facilitating high-density installations in control panels.

The primary application for a system like the 330850-91-05 is the precise measurement of differential expansion (DE) on mid-size to large steam turbine generators. Differential expansion is the critical difference in thermal growth rates between the rotating turbine rotor and the stationary machine casing (stator). 

The certified performance of the 330850-91-05 is validated under specific, clearly defined operating conditions. These specifications apply to the complete system operating within an ambient temperature range of 0°C to +45°C (+32°F to +113°F) and at a maximum altitude of 2000 meters. The system requires a -24 Vdc power supply and is typically loaded with a 10 kΩ impedance. 

When specifying and installing the 330850-91-05, adherence to its calibration parameters is essential for reliable data. The system's accuracy and interchangeability specifications do not apply if it is calibrated or used with any target other than the specified AISI 4140 steel. This highlights the importance of proper target material and geometry in the field.
Alternative Names
330850-50-05 330850-51-05 330850-90-05 330850-91-00
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What is the primary application and key specification of the 330850-91-05 system?
The 330850-91-05 is specifically designed for measuring differential expansion (DE) on mid-size to large steam turbine generators. Its key specification is an exceptionally wide linear range of 12.7 mm (500 mils), enabled by its 25 mm probe and 0.787 V/mm (20 mV/mil) output sensitivity. This range is necessary to track the significant relative motion between the turbine rotor and casing during thermal cycles.
What are the critical calibration and operating conditions for the 330850-91-05 to meet its specifications?
The published performance of the 330850-91-05 is guaranteed under strict conditions: an ambient temperature of 0°C to +45°C (+32°F to +113°F), up to 2000m altitude, with a -24 Vdc supply into a 10 kΩ load. Most critically, it must be used with a Bently Nevada supplied AISI 4140 steel target that is 61 mm (2.4 in) in diameter or larger, and the probe must be gapped at 7.0 mm (275 mils). Using a different target invalidates the accuracy specs.
What does the
For the model 330850-91-05, the total system length of 9.0 metres (29.5 feet) refers to the combined electrical path from the probe tip to the Proximitor Sensor terminals. This length includes the integral cable from the 25 mm probe plus the separate extension cable that connects it to the DIN-rail mounted 3300 XL 25 mm Proximitor Sensor. This length is designed to provide sufficient reach in large turbine generator installations.
Why is the target material specification so important for the 330850-91-05?
The system accuracy and interchangeability specifications for the 330850-91-05 do not apply if a different target material is used. Eddy current sensors are calibrated for specific material properties (like conductivity and permeability). The system's 12.7 mm linear range and 0.787 V/mm output are precisely characterized using a Bently Nevada AISI 4140 steel target. Using any other material (e.g., a different alloy or stainless steel) will introduce significant measurement error, compromising the reliability of the critical differential expansion data.

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