Precise monitoring of shaft vibration and position

With the new SPS (Smart Proximity System) series, Avibia GmbH presents a modular, digital eddy current measuring system developed by the Swiss sensor specialist MC-Monitoring for the non-contact detection of vibrations and positions of rotating shafts. It is ideal for monitoring turbines, pumps, and electric motors in harsh industrial environments.

The measuring system enables the precise detection of imbalances, misalignments, looseness, and axial bearing wear in rotating machines. The non-contact method ensures precise measurements of distance and position, even in harsh industrial environments where factors such as dirt, oil, or electromagnetic interference are present.

The SPS series consists of the PSP-121 proximity sensor, the PSE-100 proximity system extension cable, and the DPT-100 digital proximity measuring transducer.

The PSP-121 sensor, with its thermally compensated coil, is housed in a robust AISI316L housing and equipped with a thermoplastic PPS tip. Combined with the chemically resistant PSE-100 FEP triaxial cable, it ensures reliable and long-lasting performance in harsh environments – at temperatures from -35°C to +180°C.

The DPT-100 Digital Proximity Transmitter is a powerful measuring transducer. It feeds the sensor with a high-frequency signal that generates an electromagnetic field at the sensor tip. This field induces eddy currents in the metallic target. Movements of the target change the magnetic field, with the changes directly corresponding to the distance between the sensor and the target. The DPT-100 precisely detects these changes and converts them into an accurate distance signal. In addition to dynamic signals (8 mV/μm or 4 mV/μm), the device also offers a 4–20 mA output signal and a digital Modbus interface with real-time data such as pk-pk, pk, and mean (gap).

The SPS series offers linear measuring ranges of 2 mm and 4 mm, a frequency range from DC to 10 kHz (-3 dB), and selectable system lengths of 5 or 10 m. The modular components are interchangeable and available in various configurations – for maximum flexibility and easy maintenance. "With the SPS series, we offer a powerful measuring system for modern condition monitoring of rotating machines – robust, digital, and precise," summarizes Frank Ringsdorf, Managing Director of Avibia GmbH.

The features of the SPS series at a glance:

• Linear measuring ranges: 2 and 4 mm
• Frequency range: DC to 10 kHz (-3 dB)
• Temperature range (sensor and cable): -35 to +180 °C
• 4-20 mA characteristic output (option)
• Built-in digital Modbus interface
• Rugged and sealed construction
• Systems with 5 or 10 m total length