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The 3300 XL 25 mm Transducer System consists of a separate25 mm probe, an extension cable, and a 3300 XL 25 mmProximitor Sensor. The 0.787 V/mm (20 mV/mil) output givesthis system a linear range of 12.7 mm (500 mils). Based onthis linear range, the 3300 XL 25 mm Transducer System issuitable for measuring differential expansion (DE) on mid-size to large steam turbine generators caused by thedifference in growth rates between the turbine rotor and themachine stator (casing).

Frequently Asked Questions

Q : What is the maximum linear measuring range of this 25 mm probe?

The full linear measuring range is 12.7 millimeters (500 mils). The linear region typically kicks in after a minimum standoff gap of approximately 0.5 mm (20 mils) from the sensor's physical face.

Q : What is the nominal scale factor (or sensitivity) of this system?

The system features an Average Scale Factor (ASF) of 0.787 V/mm (20 mV/mil). This means that for every 1 millimeter of physical displacement relative to the target material, the Proximitor sensor changes its output by 0.787 Volts.

Q : Can the 3300 XL Proximitor sensor be mounted directly to the turbine's outer shell?

No. The Proximitor sensor housing has a maximum operating temperature rating of only +100°C (+212°F). It must be housed in a weather-proof field junction box located in a cooler area away from hot turbine surfaces.

Q : What is the minimum allowable bend radius for the probe cable?

For the standard unarmored cable featured on this specific model, the minimum allowable bend radius is 25.4 mm (1.0 inch). Bending the cable at sharp right angles will crack the internal dielectric core and ruin signal integrity.

Product Applications

Power Industry: Installed on medium and large steam turbine generator sets in thermal power plants to monitor the thermal expansion difference (differential expansion) between the rotor and casing, preventing component friction damage.

Petrochemical Industry: Used for mechanical condition monitoring and protection of large compressors, turbines, fans, and other hydrodynamic bearing equipment in oil refineries and chemical plants.

Iron and Steel Metallurgy: Configured in shaft position monitoring systems for critical rotating equipment such as large heavy-duty rolling mills and blowers.