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The TQ412 S3960 111-412-000-013 is a high-performance, non-contact proximity sensor for reverse-mount applications, forming a fully interchangeable, calibrated measurement system when paired with an IQS900 signal conditioner. Perfect for monitoring machine shafts, the system outputs a precise voltage or current proportional to the gap distance, relying on an active wire coil molded inside a Torlon tip with a durable stainless steel body. The sensor features an integral coaxial cable terminated with a self-locking miniature connector, and its target material must always be metallic.
Non-contact measurement system based on eddy-current principle
Ex certified versions for use in hazardous areas (potentially explosive atmospheres)
Voltage or current output with protection against short circuits
Driven by the high-quality IQS900 signal conditioner, the system utilizes a high-frequency modulator/demodulator to generate the precise electromagnetic field required for accurate gap measurement. For extended reach and robust mechanical protection, the front-end can be lengthened using an EA402 extension cable, supported by optional environmental junction boxes. The entire TQ4xx-based system integrates seamlessly into industrial setups, powered either by independent power supplies or directly via machinery monitoring systems like VM600, VM600Mk2, or VibroSmart modules.
Driven by the IQS900, the system generates a high-frequency electromagnetic field for accurate measurement, which can be integrated into systems like the VM600 or VibroSmart. As part of the vibro-meter line, this system complies with API 670 standards for critical machinery protection.
It operates in harsh environments (-40 to +180 °C) and offers a DC-20 kHz frequency response. Ex-certified versions are available for hazardous locations, commonly used for monitoring shaft vibration and axial displacement in turbines and pumps.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Vibro Meter TQ412 S3960 111-412-000-013 Proximity Transducer Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Thermal Power Generation
Monitoring shaft vibration in large steam turbine generators. As the main shaft operates under high-speed and high-pressure steam, the TQ412 measures bearing clearance and axial displacement to prevent rotor-to-stator rubs caused by thermal expansion or imbalance.
Oil & Gas Upstream Production
Monitoring drive shafts of crude oil export pumps and high-pressure water injection pumps on offshore platforms or onshore wells to provide early fault diagnosis and prevent mechanical friction sparks in hazardous environments.
Petrochemical & Refining
Installed in large centrifugal compressors used for catalytic cracking or gas separation. The reverse-mount design allows it to fit into tight bearing housings to precisely measure axial thrust gap, protecting the impellers.
Hydroelectric Power Generation
Monitoring the relative vibration (runout) and thrust bearing clearance of large vertical shafts in hydro turbine generators to prevent severe shaft wobbling and machinery damage caused by uneven hydraulic forces.
Nuclear Power Industry
Used in non-nuclear island areas of nuclear power plants to monitor the rotating shafts of main feedwater pumps and secondary circuit steam turbines, ensuring high continuous reliability of the cooling water supply system and avoiding unplanned downtime.
During installation, a dedicated reverse-mount bracket must be used, and the initial gap between the probe tip and the metallic target must be strictly controlled to avoid impact and ensure alignment within the linear measuring range, the target shaft surface must also be smooth and free from magnetic cross-interference.
Avoid over-bending or pulling the integral coaxial cable, and use protective enclosures at cable junctions to prevent moisture and dust ingress. Furthermore, for operations in hazardous areas, the system must be powered through an IQS900 signal conditioner paired with safety barriers to fully comply with intrinsic safety (Ex) regulations.
The Meggitt vibro meter TQ412 S3960 111-412-000-013 is an API 670 compliant, 8 mm reverse-mount non-contact eddy-current proximity transducer. Constructed with AISI 316L stainless steel and Torlon material, it features an IP68 protection rating, supports high temperatures from −40°C to +180°C, and carries ATEX/IECEx intrinsic safety approvals, engineered specifically to deliver high-precision shaft vibration, axial displacement, and Keyphasor speed measurements for rotating machinery.
It is an industrial-grade, non-contact eddy current proximity transducer manufactured by Vibro-Meter, specifically designed to accurately measure the relative displacement, shaft vibration, and axial position of rotating machinery shafts.
How does the TQ412 S3960 111-412-000-013 proximity transducer work?
It works based on the eddy current principle. The wire coil inside the sensor tip is excited by a high-frequency signal to generate an alternating magnetic field. When a metallic shaft approaches, eddy currents form on its surface, changing the coil's impedance, which the backend conditioner converts into a voltage or current signal proportional to the gap distance.
How do you correctly use this type of non-contact eddy current sensor like the TQ412 S3960 111-412-000-013?
It cannot be used as a standalone unit directly connected to acquisition boards; to use it, it must be reverse-mounted onto a machine bracket and connected via its integral coaxial cable to an EA402 extension cable and an IQS900 (or older IQS450) signal conditioner.
What is the mechanical thread specification for installing the TQ412 S3960 111-412-000-013?
According to the standard technical specifications of the 111-412-000-013, the housing body of the transducer is equipped with a metric M10 x 1 mechanical thread.
What is the reverse-mount technical feature of the TQ412 S3960 111-412-000-013?
Reverse-mount means this transducer is typically used with a protective sleeve, where the probe tip passes through from the inside of the housing or bracket, and the cable exits directly from the opposite side of the mounting thread. It is primarily used in space-limited or blind-mount industrial scenarios such as inside large bearing pedestals.
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