Magnetic proximity sensor

mechanicalcylindricaldigital

Proximity probes are non-contact eddy-current sensors designed to precisely measure shaft vibration and axial thrust position in rotating equipment. These monitoring solutions are essential for ensuring the safe, efficient operation of assets such as hydrogenerators, turbines, pumps, fans...By continuously tracking mechanical behaviors like imbalance, misalignment, and axial displacement, proximity probes enable early detection of faults—supporting predictive maintenance strategies that reduce unplanned downtime, improve reliability, and extend equipment life.MC-monitoring offers three complementary proximity probe solutions, each engineered to match specific operational needs:The Smart Proximity SystemThe Integrated Proximity ProbeThe Analog Proximity SystemWhether you require advanced data integration, streamlined setup, or rugged compliance for harsh conditions, our proximity probe range helps you monitor the health of your most critical machines with confidence.Smart Proximity System (SPS)The Smart Proximity System is a modular, high-performance eddy-current solution designed for advanced condition monitoring and protection. Thanks to its built-in Modbus interface, it delivers time-based calculated values such as pk, pk-pk, mean shaft position (gap).These values are computed directly at the transmitter level, minimizing the need for external processing and allowing seamless integration into modern SCADA, DCS, or edge monitoring platforms.Pre-processed vibration and position data available via ModbusInterchangeable components (probe, extension cable, and transmitter) simplify maintenance and spare parts managementMeasurement ranges: 2mm (8mV/μm) and 4mm (4mV/μm)Frequency range: DC to 10 kHz (-3 dB)Temperature range (sensor & cable): −35 to +180 °C4-20 mA processed output optionBuilt-in digital Modbus interfaceRobust and sealed design5m or 10m total length systemsComponents of a Smart Proximity SystemThe Proximity System Probe (PSP): high-performance eddy-current sensor for precise, non-contact measurements in tough industrial environments.The Proximity System Extension cable (PSE): industrial-grade coaxial cable for easy disconnection near the measurement point, simplifying installation and maintenance.The Digital Proximity Transmitter (DPT): core processing unit, powers the probe and converts the measured signal into actionable data. Offers both raw dynamic output and processed values via Modbus or optional 4–20 mA.All system elements are fully interchangeable, enabling quick on-site servicing and reducing downtime without compromising performance or signal integrity.Understanding Signal OutputsDynamic Voltage Output: raw analog signal (8 mV/µm or 4 mV/µm) for commissioning, vibration analysis, or direct monitoring.Modbus RTU (Digital Output): real-time access to calculated values such as mean gap, peak, and peak-to-peak displacement.4–20 mA Processed Output (Optional): digitally processed signal scaled to represent position or vibration amplitude.Together, these outputs make the SPS suitable for both continuous machine protection and advanced diagnostics, across both legacy and modern systems.Integrated Proximity Probe (PPT-280)The PPT-280 is a compact, all-in-one proximity probe designed for fast, straightforward installation without the need for external signal conditioners. The probe is designed with integrated linearization electronics to ensure excellent linearity and active temperature compensation. The integrated 750 kHz oscillator ensures a measurement with minimal magnetic run out effect. It integrates the eddy-current into a single, sealed body—delivering a direct voltage output proportional to the shaft’s position.An optional configuration kit allows users to adjust the measuring range, power supply voltage, and perform on-site calibration, making the PPT-280 a flexible and efficient solution for standard vibration or axial position monitoring.One-component installation simplifies wiring and saves space—no external driver requiredConfigurable setup using a field-adjustable kit (optional) for range and polarity tuningMeasurement ranges: 2mm (8mV/μm) and 4mm (4mV/μm)Frequency range: 0 to 1.2kHzBuilt-in linearization electronic & active temperature compensationSupplied with -24V or +24V depending on the configurationOptional: configuration kit and digital interface for setting and calibration10m lengthThe PPT-280 is ideal for users seeking a compact, self-contained proximity probe that minimizes installation effort and component count.Analog Proximity System (PPT-080/110)The PPT-080/110 is a robust, API 670-compliant proximity probe system engineered for critical machinery protection in industrial and hazardous environments. Based on eddy-current technology, the system includes a probe, extension cable, and driver, delivering a raw voltage output (or optional 4–20 mA) directly proportional to shaft displacement.With optional ATEX, IECEx, and CSA certifications, this system is ideal for deployment in explosive atmospheres and regulated installations. It’s the trusted choice for applications demanding high reliability, long-term stability, and full compliance with protection standards.Fully compliant with API 670 for protection of critical rotating equipmentAvailable with ATEX and IECEx certifications for use in hazardous zonesLinear measurement ranges and sensitivity: 2mm and 4mmCertified for use in potentially explosive atmospheres5m or 9m total length systemsLoop powered transmitter (4-20mA)The PPT-080/110 is the go-to solution for critical equipment protection in power plants, refineries, and heavy industry.Advanced analysis with CMS-500PMonitoring both vibration and position is critical for understanding the real health of rotating equipment. The CMS-500P provides the tools to turn this data into actionable insights for long-term performance and reliability.FFT – Frequency-Based Vibration AnalysisThe Fast Fourier Transform converts the raw vibration signal into its frequency components, revealing mechanical faults like resonance, unbalance, or misalignment. It’s essential for in-depth diagnostics and root cause analysis.Orbit Plot – Shaft Vibration in the Radial Plane (X-Y)Orbit plots visualize the shaft's real-time motion in the horizontal plane using two orthogonal proximity probes. This view is key to identifying unbalance, rubs, fluid film instabilities, or looseness — especially during startup, shutdown, or transients.Shaft Center Line – Radial Shaft Position Over Time (X-Y Plane)The Shaft Center Line plot shows the average position of the shaft within the bearing clearance, based on two orthogonal proximity probes. It reveals how the shaft moves or drifts over time due to load changes, thermal effects, misalignment, or oil film behavior.This view is particularly valuable in vertical machines, where oil film conditions and dynamic loads can cause subtle radial shifts. By tracking these trends, operators can detect evolving mechanical issues and indirectly assess the performance of the bearing lubrication system.ApplicationsHydrogeneratorsGas & steam turbinesPumps, fans & cooling towersAvailable modelsSPS: Measuring range 0.2mm to 2.2mm or 0.2mm to 4.2mm; Sensitivity 8mV/µm or 4mV/µm; Modbus interfacePPT-280: Measuring range 0.2mm to 2.2mm or 0.2mm to 4.2mm; Sensitivity 8mV/µm or 4mV/µm; 10m integral cablePPT-080: Measuring range 0.25mm to 2.25mm; Sensitivity 7.87mV/µm; 8m or 4m extension cablePPT-110: Measuring range 0.4mm to 4.4mm; Sensitivity 3.94mV/µm; 8m or 4m extension cablePPT-990 configuration kit: Configuration kit for PPT-280Key technical characteristics / specifications:Non-contact eddy-current technologyMeasurement ranges: 2mm, 4mm, 0.2–2.2mm, 0.2–4.2mm, 0.25–2.25mm, 0.4–4.4mmSensitivity: 8mV/μm, 4mV/μm, 7.87mV/μm, 3.94mV/μmFrequency range: DC to 10kHz (SPS), 0–1.2kHz (PPT-280)Temperature range: −35 to +180°C (sensor & cable)Output: Raw voltage, 4–20mA (optional), Modbus RTU (digital)Compliance: API 670, ATEX, IECEx, CSA (optional)System length: 5m, 9m, 10mRobust, sealed, industrial-grade design