The 3300 XL 25mm eddy current sensor system consists of a stand-alone 25mm probe, extension cable and 3300 XL 25mm preamplifier. A 0.787 V/mm(20 mV/mil) output gives the system a linear range of 12.7 mm(500 mil). Due to this linear range, the 3300 XL 25mm sensor system is suitable for measuring differential expansion (DE) on medium to large steam turbine generators due to different expansion rates between the turbine rotor and the machine stator (casing).
The 3300 XL 25mm sensor system consists of a 25 mm probe, an extension cable and a pre‑amplifier. It provides a linear measurement range of 12.7 mm (500 mil) and is suited for measuring differential expansion in turbine generators.
The manual details probe construction, cable options, mounting accessories, electrical and mechanical specifications, and ordering information, with guidance for calibration and safety compliance. This manual is written in Chinese.
| Output sensitivity | 0.787 YAm (20 mV/mil) |
|---|---|
| Linear range | 12.7 mm (500 mil) |
| Probe operating temperature (continuous) | up to 200 °C |
| Probe operating temperature (intermittent) | up to 250 °C |
| Supply voltage | 17.5 VDC – 26 VDC |
| Load resistance | 10 kΩ |
| Maximum cable length (to monitor) | 305 m (1000 ft) |
| Frequency response | 0 – 2.7 Hz (typical –0 to –3 dB) |
| Minimum target diameter | 61 mm (2.4 in) |
The system provides a linear range of 12.7 mm (500 mil).
The probe can operate continuously up to 200 °C and intermittently up to 250 °C.
The system requires a supply voltage between 17.5 VDC and 26 VDC.
The maximum cable length from the pre‑amplifier to the monitor is 305 m (1000 ft).